SEBS - ELASTRON G101.A83.B

1 of 246 products in this brand
A soft, black SEBS based thermoplastic elastomer (TPE) compound that offers good physical properties and chemical resistance.

Polymer Name: Styrene Ethylene Butylene Styrene (SEBS)

Processing Methods: Extrusion, Injection Molding

Tear Strength: 50.0 - 50.0 kN/m

Strain at Break: 800.0 - 800.0 %

Compression Set (70 °C): 48.0 - 48.0 %

Technical Data Sheet

Knowde Enhanced TDS

Identification & Functionality

Technologies

Features & Benefits

Advantages of Elastron G
  • Service temperature -40˚C to +130˚C
  • Wide hardness range (5sh A- 60 ShD)
  • Resistance to weathering, ozone, UV and impact
  • Recyclable
  • Provides quite higher saving on the processing cost
  • Non hygroscopic, pre drying is not necessary except G20X and G500 series
  • Adhesion to PA, ABS, PS and PC engineering plastics
  • Resistance to acid, base and detergents
  • Abrasion resistance
  • Some special grades, resistant to bacterial attack and fungus growth
  • Antistatic compounds available
  • Many grades conforming to FDA regulations
  • Available in translucent and transparent forms
  • Density changes between 0,89 and 1,25 g/cm³
Features for Consumer Goods & Personal Care

• Food contact approved grades available
• Antistatic grades available
• EN 71-3 toy safety conformity
• No human skin irritation
• UV and Ozone resistance
• Resistance to chemicals and oils
• Peeling strength
• Availability of very soſt grades
• Excellent surface appearance
• Excellent bonding to many plastics
• Easy to color
• Colored compounds available
• 100% recyclable
Bondable Grades for Consumer
Elastron Bondable Grades are SEBS based TPEs which are designed to overmold onto many engineering plastics. They are suitable for both multi-shot and insert molding processes. These grades are used in various applications with ergonomic and flexible design advantages. Elastron grades can be overmolded on to:
•PP
•PS
•PE
• ABS
• PA
• PC
• PET
• PETG
Personal Care Grades for Consumer Goods
Elastron food contact grades for consumer goods have particularly been designed for bondable applications like toothbrush, razor…
• Overmolding onto many plastics
• Excellent scratch and peeling resistance
• Contains no hazardous substances for human skin
• FDA approval
• 10/2011/EC approval
• PVC, phthalate, bisphenol, metal free

ELASTRON Products Features at a Glance

• Excellent UV and ozone resistance
• Abrasion resistance
• Available products for adhesion to PP,PE, etc and engineering plastics. (ABS,PC,PA, etc.)
• High temperature resistance
• OEM approved grades
• Excellent compression set
• Low temperature resistance
• %100 recyclable

Features of Construction

• RAL GZ 716/1 approved
• CSTB QB 36 approved
• Compliant with EN 681/2 (Waste Water Pipe Seals) standard
• Excellent weathering resistance
• Perfect UV resistance
• Colored compounds
• Excellent compression set
• Resistant to high temperatures
• Excellent low temperature resistance
• Co-extrusion with many plastics
• Excellent surface appearance
• 100% recyclable
• Halogen free flame retardant grades (HFFR)
• Meets ASTM F477 Pipe Specification

Key Benefits of Weatherseals
  • Long term durability
  • Excellent Weathering Resistance
  • Excellent Sealing Performance
  • Elasticity 
  • Low Weight
  • Fast Production, Reduced Lobor Cost
  • Process Advantages
  • Recyclable
Features For Electrical & Cables

• Excellent surface appearance
• Resistance to high temperatures
• UL 94 HB / V0 / V1 listed products
• Halogen Free Flame Retardant
(HFFR)
• 100% recyclable
• Copper stabilized grades
• Low dielectric constant and high oxygen index
• High dielectric strength, surface and volume resistivity
• Ease of extrusion
• Excellent low temperature properties
• Excellent compression set properties
• Low smoke density
• RoHS, ELV and WEEE compliance
• Non-toxic
• Resistant to oil, chemicals, acids&bases
• Easy to color with masterbatch
• Excellent UV resistance
• Colored compounds available

Key Benefits of Under the Hood & Chasis

• Long term durability
• Eliminates the clamp need with system component welding
• Excellent fluid resistance
• Reduced leakage risk
• Low weight
• Fast production, reduced labor cost
• Process advantages
• Vibration dampering
• Elasticity
• Recyclable

Key Benefits of Exterior

• Long term UV and ozone resistance
• Colorable
• Tear and abrasion resistance
• Impact resistance at low and high temperatures
• Low weight
• Flexible at low temperatures Easy processing and good flow property
• Bondability to various plastics (PP, ABS, PA, PC, PE)
• Low labor cost
• Recyclable

Features For White Goods & Appliances

• Resistant to detergents, acids, bases, etc.
• Good weathering resistance
• Excellent UV resistance
• Colored compounds
• Excellent compression set
• Resistant to high temperatures
• Excellent low temperature resistance
• Co-extrusion with many plastics
• Excellent surface appearance
• 100% recyclable

Key Benefits of Interior

• UV Resistance
• Colorable
• Soft Touch, antislip
• Scratch and abrasion resistance
• Low emission
• Low weight
• Low odor behavior
• Easy process and good flow property
• Recyclable

Features of Medical

Features
• Excellent bonding to many thermoplastics
• Easy to color
• Excellent surface appearance
• Antistatic compounds available
• Soſt touch compounds
• Availability of transparent grades
• 100% recyclable
Other Features
Elastron medical TPE compounds are tested according to USP ‘88’ for their in vivo biocompatibility and ISO 10993-5, USP ‘87’ for their in vitro cytotoxicity. Tested compounds all have USP Class VI approvals. Elastron medical TPE compounds also meet requirements of European Pharmacopeia monographs 3.2.8 sterile single-use plastic syringes and 3.2.9 rubber closures for containers for aqueous parenteral preparations for powders and for freeze-dried powders. Elastron medical TPE compounds are sterilizable with gamma irradiation, ethylene oxide (EtO) and steam.

Features of Food

The monomers and additives used in manufacturing food contact TPE grades should be listed in the Union List of Authorized Substances of Regulation 10/2011/EC on plastic materials and articles intended to come into contact with food. Ingredients used in manufacturing these products are subject to a specific migration limit (SML).
Elastron provides the quality and conditions of above mentioned regulation and limits.
• Excellent bonding to many thermoplastics
• Easy to color
• Excellent surface appearance
• Soſt touch compounds
• Availability of transparent grades
• 100% recyclable
• NSF 51/61 Compliant Grades

Applications & Uses

Plastics & Elastomers Processing Methods
Processing Information
Injection MoldingTypical Value (English)Typical Value (SI)
Rear311 to 347 °F155 to 175 °C
Center329 to 365 °F165 to 185 °C
Front347 to 383 °F175 to 195 °C
Nozzle383 to 437 °F195 to 225 °C
Mold77 to 122 °F25 to 50 °C

Extrusion MoldingTypical Value (English)Typical Value (SI)
Feed320 to 356 °F160 to 180 °C
Rear329 to 365 °F165 to 185 °C
Center338 to 374 °F170 to 190 °C
Front365 to 401 °F185 to 205 °C
Head374 to 428 °F190 to 220 °C
Die383 to 437 °F195 to 225 °C
Consumer Goods & Personal Care Applications

Elastron offers high quality TPE compounds to designers and producers of consumer goods with a wide range of applications.
• Grips & Soſt Touch & Handles
• Lids & Covers & Caps
• Bed Support
• Wheel & Trolley & Tire
• Toy Applications
• Razors
• Toothbrushes
• Bathroom Applications
• Vacuum Cleaner Parts
• Gaskets For Consumer Goods
• Sporting Goods Applications
• Carpet Backing

Automotive Applications

Elastron develops not only products but also solutions for special applications according to automotive industry needs.
As a result of this focus Elastron is certified with IATF 16949. With its specialized grades Elastron offers solutions for weatherseal, interior, exterior, under the hood applications. We are in close cooperation with OEMs to track down the needs closest way to serve our partners. The grade selection is not limited. As we are eager to serve our customers as a solution provider, thus we are flexible to develop tailor made products for our partners. Not limited with this list but main applications you can face at an automobile are;
Weatherseals
• Inner&Outer Belt Line Seals
• Glass Run Channels
• Sun Roof Seals
• Glass Encapsulation
• Corner Molding
• Slip Coat
• End Caps
• Cowl Vent Seal
Exterior
• Bumper Spoiler
• Wiper Spoiler
• Mud Flaps
• Antenna Bezels
• Wheel Housing Parts
• Fuel Entrance Cover Seal
• Side & Front Spoiler
Interior
• Pad Heel
• Pads & Cup Holders
• Hvac Door Seals
• Floor Mats
• Seat Gaskets
• Glovebox Cover & Housings
• Pedal
• Horn Cover
• Handbreak Mechanism Seal 
• Handbreak & Gearshift Bellow
Under the Hood & Chassis
• Clean Air Duct
• Suspension Bellows
• Radiator Seals
• Steering Bellows & Dust Boots
• Grommets & Plugs
• Fuel Line Hose
• Mechanism Cable Covers & Brake Conduit
• AC Waste Ater Pipe
 • Air Filter Seal
Glowbox Cover & Housing
Glowbox covers made with colourable Elastron TPO meets low emission standards required for interior parts and provides good impact long term UV and abrasion resistance.
Gearshift & Handbrake Bellow
Gearshift and Handbrake Bellows made with Elastron TPV and Elastron Goffer long time UV durability, good flow and surface properties.
Pad Heel
Pad heel made with Elastron TPO is bondable to polyester mat with special hot melt and provides antislip effect for driver comfort.
Pad & Cup Holder
Pads and cup holders made with Elastron SEBS and Elastron TPV provides light weight, perfect appearance and meets low emission requirements for automotive interior applications.
Handbrake Mechanism Seal
Various gaskets made with Elastron TPV and Elastron SEBS based products offer improved isolation high surface quality and meets low emission standards.
Horn Cover
Elastron TPO and Elastron G (SEBS based) products offer high scratch and abrasion resistance. Elastron products bondable to ABS and PP with 2K molding reduce cycle time and cost.
HVAC Door Seal
Elastron TPV provides long term dimensional stability and sealing advantage in flapper door seals. It meets the low emission standards.
Mat
Mats made with Elastron SEBS compounds provides fast production lower weight long term abrasion and UV resistance compared to Rubber
Pedal
Pedals made with Elastron TPV provides long term abrasion resistance and meet low emission standards required for interior parts.
Wiper Spoiler
Long term UV stability, scratch resistance and non staining properties make Elastron TPV a choice for Wiper Spoiler application.
Side & Front Spoiler
Spoilers made with Elastron TPV and SEBS are flexible and have resistance to impact at low and high temperatures.
Antenna Bezel
Antenna bezels made from Elastron TPV prevents transmitting vibrations to metal surfaces and has long term dimensional and UV stability.
Fuel Entrance Cover Seal
Elastron TPV is used at fuel entrance cover with the advantages of splash resistance to gasoline and long term sealing performance.
Mud Flap
Mud flaps made with Elastron TPO and Elastron SEBS remains flexible at low temperatures and have excellent UV stability
Wheel Housing Part
Injection molded Elastron TPV and Elastron TPO remain flexible at low temperatures and dampen the noise and vibration.
Air Filter Seal
Elastron TPV bondable to PP provides high heat and chemical resistance, long term sealing and fast processing for air filter seals.
Clean Air Duct
3D Blow Molding technology is used to bring together PP and Elastron TPV or Elastron TPO to reduce weight and to provide design option for different part geometry. Mechanism Cable Cover & Brake Conduit
Mechanism Cable Cover and Brake
Conduit made from Elastron TPV and Elastron TPO provides impact resistance, flexibility, corrosion resistance and superior dampening properties for cable cover application.
AC Waste Water Pipe
Elastron TPV bondable to PP prevents leakage and reduce the labor cost with 2K injection molding process in tubing applications.
Suspension Bellow
Suspension Bellows can be produced with Extrusion Blow Molding. Bellows produced with Elastron TPV reduces cycle time and labor cost.
Radiator Seal
Elastron TPV coextruded with PP dampens the noise around the radiator and provides long term heat and chemical resistance.
Steering Bellows & Dust Boot
Bellows made with Elastron TPV provides reduced cost, design flexibility with the process options; Injection Blow Molding Extrusion Blow Molding continious vacuum corrugation and Press Injection.
Grommet & Plug
Various plugs, bumpers and grommets can be produced with Elastron TPV and Elastron SEBS. Elastron products provides long term aging and heat resistivity.
Cowl Vent Seal
High flow SEBS based Elastron G Products be used for 2K injection process with PP.
Glass Run Channel
Good surface quality with excellent dimensional stability Elastron TPV provides lower cost and fast processing.
Sun Roof Seal
Especially designed Elastron TPV products for weatherseal applications reduce total vehicle weight and provide short cycle time comparing with EPDM rubber.
Inner & Outer Belt Line Seals
Elaston TPV Co-extruded with PP provides excellent sealing performance and weathering resistance.
Glass Encapsulation
Easy flow Elastron TPV and SEBS based products can be used in two different ways.
• Direct injection on glass
• Assembling to the glass after injection.

Construction Applications

Elastron TPE grades specifically designed for construction industry applications are based on EPDM/PP and SEBS.
• Window Seals
• Pipe Seal Applications
• Dilatation Expansion Seals
• Door & Garage Applications
• Hose & Tube Applications
• Other Seal Applications
• Flame Retardant Applications
• Power Tools

Electrical & Cables Applications

Elastron provides flexible and high performance TPE solutions for electric and cable applications.
Applications
• Wire & Cables
> Primary Insulation
> Cable Jacketing
> Welding Cables
> Coaxial Cables
> Mechanical Tool Cables
> Instrumentation Cables
• Cable Multigates And Grommets
• Industrial Plugs And Switches
• Electrical Seals And Other Accessories
Halogen Free Flame Retardant (HFFR) Compounds for Eelectrical
Applications

Elastron Halogen Free Flame Retardant (HFFR) grades also offer great advantages for electrical applications. TPE grades for both injection and extrusion processes are available.
• Excellent long term electrical
properties
• Halogen free
• Excellent bonding to many plastics
• UL V0, V1, V2 and HB listed
• RoHS, ELV and WEEE compliant
• Colored compounds available
• Non-toxic
• Copper stabilized grades
• Oil & chemical resistance
• Low smoke density
• Suitable for dry & wet applications
• Excellent UV and ozone resistance
• 100% recyclable
• Easy to color with masterbatch

White Goods & Appliances Applications

Elastron offers low and high temperature resistant, RoHS compliant, detergent, acid&base resistant grades with excellent compression set values.
• Washing Machine Applications
• Dishwasher Applications
• Dryer Applications
• Refrigerator Applications

Medical Applications

Elastron medical TPE compounds are tested according to USP ‘88’ for their in vivo biocompatibility and ISO 10993-5, USP ‘87’ for their in vitro cytotoxicity.
• Syringe tips
• Infusion bottle caps
• Clogs (Antistatic and steam
sterilizible for medical applications)
• Sterilizible for medical applications

Food Applications

With the help of the experiences gained from manufacturing of medical TPE compounds, Elastron offers high quality food contact TPE compounds.
• Food Packing
• Food Box Seals
• Grips for Kitchen Equipments
• Water Pump Seals

Properties

Color
Physical Form
Incompatible with
PVC, Acetal
Physical Properties
ValueUnitsTest Method / Conditions
Compression Set (at 100°C for 22 hr)69%ASTM D 395
Compression Set (at 23°C for 22 hr)24%ASTM D 395
Compression Set (at 70°C for 22 hr)48%ASTM D 395
Density1.15g/cm³ASTM D 792
Durometer Hardness83Shore AASTM D 2240
Elongation at Break800%ASTM D 412
Modulus of Elasticity (100%)3.6MPaASTM D 412
Modulus of Elasticity (300%)4.7MPaASTM D 412
Tear Resistance50N/mmASTM D 624
Tensile Strength at Break9MPaASTM D 412
Aging Test
ValueUnitsTest Method / Conditions
Ozone Resistance StressedNo Cracks
Shrinkage
ValueUnitsTest Method / Conditions
Across Flow1.16%ASTM D 955
Flow2%ASTM D 955

Regulatory & Compliance

OEM Specifications
OEM Standards

Technical Details & Test Data

Additional Information
ELASTRON products are not compatible with PVC and Acetal. Regrinding level up to 20% is recommended with minimum property loss.
Processing information for Injection

Injection Molding
SEBS - ELASTRON G101.A83.B - Processing Information For Injection
Injection molding machine is consist of two side, a clamping side and an injection side. The main purpose of the clamping side to open and close the mold, and the ejection of products. The purpose of the injection unit are to melt the material by heat being specified and then to inject molten material into a mold. The screw is rotated with the rpm being specified on the screen to melt material introduced from the hopper and to accumulate molten material in front of the screw. After the required amount of molten material is accumulated with screw retraction, injection phases are stared. As molten material is introducing in a mold, the injection machine controls the ram speed of the screw, or injection speed (speed profile). In addition to this, it controls molding pressure after molten material fills out cavities.


Injection Molding Cycle
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1. Filling Phase: Melt must be filled to the mold as fast as possible according to the part geometry. If there are any restricted area having affected to the filling properties, proper speed profile must be determined. Flow characteristics are determined by melt temperature, speed, and shear rate. Too high injection speed can create excessive shear and result in issue such as splay and jetting. High speed filling is terminated at Switchover point and low speed packing phase commences.
1.1. Switchover Point: It’s a transition point from filling to packing and plays a crucial role in the quality of the molded parts. Late switchover can cause building up of excessive cavity pressure and it leads to flash and mold opening. Early switchover is also leads to short shot and longer cycle times.
2. Packing Phase: As soon as the material gets into the cavity, cooling starts and it induces shrinkage. That’s why, there is a need to inject more material in, in order to prevent this shrinkage. After being loaded %98 volume of cavity, injection speed and pressure must be reduced during this phase. Due to the fact that packing pressure determines part weight and part dimensions, it is important to completely fill the mold avoiding over packing 3"! or under packing Blow!
3. Holding Phase: By reducing the pressure and speed being applied, certain amount of pressure must be applied until gate completely freezing off. Gate freezing is the solidification of material around the gate area and prevents melt backflows out of the mold and let us keep the dimension and weight values stable.
4. Gate Sealing Point: The plastic enters the cavity through the gate. As long as the gate is not frozen, new material comes in to the mold replacing unoccupied free spaces left from shrinking material. At the end of the solidification, gate is completely blocked due to cooled down and no any material can get to flow path back.
5. Cooling Phase: To ensure optimum molding cycles while maintaining part surface requirements and mold filling capability, a stable mold temperature should be determined and maintained. The cooling time takes about 80% of injection molding cycle, so a well-designed cooling system can shorten the molding time and improve the productivity.


Material Moving in The Runner
SEBS - ELASTRON G101.A83.B - Processing Information For Injection - 3

SEBS - ELASTRON G101.A83.B - Processing Information For Injection - 4
During injection, injection speed and material viscosity are two of the most important factors to effect the molding quality. If your material is low viscous material do not use excessive injection speed because high speed generates high shear rates and material gets warmed on the way of runner and it’s temperatures exceed the degradation level. In that case your material would get sticked to the cavity wall after injection. If your material is sticking to the mold, reduce your injection speed gradually.


Material Molding in The Mold
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Case 1: Thanks to optimum melt speed, two opposite flow channel meet seamlessly without any weak areas.
Case 2: The same material with low melt speed causes weak mixing. Cold Weld Line
Case 3: The same material with very low melt speed causes empty area due to not facing together. Short Shot.


Why Melt Speed is Low

  • Low injection speed:

During filling phase, while injection to the cavity through flowpath, melt gets cooled over the time, that’s why we
must inject the material as fast as possible, otherwise melt would get cooled on the way and there would not be
homogenous mixing at the intersection line of two separate flow.

  • High viscous material:

Material viscosity might be higher than normal. In this case, material runs slowly in the flow path despite the
injection speed being increased.

  • Low mold temperature

If mold temperatures are lower than normal, material cannot move in the mold by its natural flow properties, it’s also tend to make wavely surface on the part.

  • Unproper gate location Gate
  • Low gate diameter:

Means pressure loss for injection speed in the cavity

  • Insufficient melt temperature:

Lower melt temp means higer viscosity.
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Why Gate Diameter is Important During Gate Sealing
We have to hold the material after packing phase until gate is completely freezing off. Otherwise our liquid material goes back to runner inside over the gate. That’s why, gate diameter is so important, because we have to freeze that area. Larger gate diameter increases the holding time, lower gate diameter takes place a premature freezing.
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Gater diameter is lower than normal. That means our material is still enough hot even if we have completely sealed the gate. Because due to lower diameter, our gate had frozen earlier than normal but we need to push some material when hot material cools down. In that case, after injecttion, there would be some voids inside at the same time some areas would collapse.
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Gater diameter is still not enough diameter beacuse there are some areas need to be cooled. We must increase the diameter gradually.
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We have reached the best diameter. Due to this we would not see any warpage because after gate sealing there are no any hot areas containing high risk
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Higher gate diameter increases gate sealing time so our cycle time would be greater.
 

Vent Design
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Why Back Pressure is Important
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Back pressure is the pressure when taking place on front of the screw during screw retraction to prepare the next shot. Increasing it’s values, collects more material on front of the screw, that’s why if you don’t change the injection speed strokes, your part weight would be heavier than before because of higher density taking place of the same volume in front of the screw.
 

Screw
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Compression ratio = H1/H2
L/D = Flighted Length / Screw Diameter

SEBS - ELASTRON G101.A83.B - Processing Information For Injection - 14
Reciprocating screw injection molding machines equipped with a general purpose screw design are adequate for processing the material.
This screw design, should have 50% of its length as the feed zone, 25% as the compression zone, and 25% as the metering zone. A screw L/D (length to diameter) ratio between 18:1 and 24:1 and a screw compression ratio between 2:1 and 3:1 are recommended. A floating check ring, rather than a ball check, is also recommended. Nozzles should be of the free-flow design and as short as possible.
 

Cooling
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Cooling channels must be installed correctly, if there are any voids between them, cooling effecting the part would not be balanced. That’s why warpage issue risk takes place.
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Troubleshooting for Injection

1. Short Shot
SEBS - ELASTRON G101.A83.B - Troubleshooting For Injection

  • Restricted flow areas, such as wrong type of gates, wrong dimesion of runners, and thin walls.
  • Low melt or mold temperatures.
  • Due to insufficient ventillation, trapped air inside the cavity.
  • Insufficient machine injection pressure, low injection speed.
  • Machine mulfunctioning such as blocked feed throat, or a worn non-return valve that causes loss of injection pressure or there could be some pressure loss on the flowpath.
  • Premature solidification of the material melt, poor injection speed profile, or prolonged injection time.

 

2. Flash

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  • Low clamp force: Clamping force must be higher than injeciton pressure. If the clamping force is too weak to hold the mold plates together during the injection process, flash takes place.
  • Gap within the mold: Flash will occur if the parting surface does not contact completely, due to a deformed mold structure, parting surface defect, improper machine and mold set up, or flash or foreign material stuck on the parting surface.
  • Injection parameters: High melt temperature (lowered the viscosity of the material) or high injection pressure win the calmping force and flash takes place.
  • Nonconforming venting: Due to venting design and a very poor venting system, or venting dimension is not properly.

 

3. Sink Marks

SEBS - ELASTRON G101.A83.B - Troubleshooting For Injection - 2

  • After injection, holding must be applied until gate completely freezing off, otherwise melt goes back to runner inside and sink marks takes place.
  • Short cooling time, because after stress relaxation in cooling, new material loaded to the cavity replacing the voids.
  • High melt temperature or mold temperature
  •  Due io mold design, there might be some pressure loss in order to hold the material after injection.

 

4. Splay Marks

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If material are used without predrying, the moisture inside the material can cause this marks. Also high rpm during screw retraction, generates gas and this gas are injected the parts with melted material.

  • Dryplastic according to our suggestion.
  • Reduce injection speed, because high speed generates due to friction.
  • Reduce melt temperatures by reducing the barrel temepratures.
  • Reduce screw rpm, high rpm generates gas.
  • Increase back pressure, increasing the back pressure discharge the gas through the hooper.
  • Increase mold temperatures
  • Increase venting
  • Increase gate diameters, because tight diameter generates gas due to high shear rates.

 

5. Warpage

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A differential cooling rate of the melt in two sections of the molded product.

  • Reduce melt temperature to reduce the cooling time.
  • Reduce the mold temperature to reasonable level according to our requirements
  • Increase pack and hold pressures, if any pressure loss.
  • Increase pack and hold times,
  • Due to unsufficeient cooling time warpage takes place after ejection. That’s why increase the cooling time to cool the part to suffient level.

 

6. Burn Marks

SEBS - ELASTRON G101.A83.B - Troubleshooting For Injection - 5

Material degradation
Burn marks can result from the degraded materials and then appears on the surface of the molded part or near the venting areas. Material degradation is caused by:

  • High melt temperature: Excessive melt temperature can be caused by higher barrel temperature setting, or malfunctioning in the temperature controller.
  • High screw rotation speed: If the screw rpm is too high during the plasticization time during screw retraction, that will create too much frictional heat, which could degrade the material.
  • Restrictive flow path: When the melt flows through the flowpath which icludes restrictive nozzle, runner, gate, or part sections, shear rates gets incresedheat, which could degrade the material.
  • High speed injection: Creates extra ternperatures due to frictional heat in the runner.

 

7. Voids

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Occurs when the parts thickness is high. If the mold temperature is higher than normal during cooling, the plastic melt shrinks towards the wall and therefore sucks a vacuum void on the inside of the part

  • Reduce melt temperature: Cooling after high temperature might cause the voids.
  • Reduce mold temperature: High mold temperatures keeps the melt temperatures high, that’s why thiskind of voids occur.
  • Reduce injection speed: High speed injection creates high frictional shear and melt cooling would be hard.
  • Increase pack and hold pressures: Packing and holding pressures send the gas or airs to out through the ventilation channels.
  • Increase pack and hold times

 

8. Bubbles

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Moisture or gase coming from the product gets injected in the mold cavity this moisture or gas if embedded inside the melt can show up as bubbles.

  • Dry material to suggested moisture levels:
  • Increase back pressure: Back pressure let us send the gas to outside of the mold
  • Reduce melt temperature

 

9. Gate Vestige

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  • When holding phase, reduce the injection speed and pressure
  • Arrange the injection speed profile properly,
  • Increase the melt temperature by using the barrel temperatures gradually

 

10. Jetting

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  • Place the gate to against to metal surface.
  • Use an overlap gate or a submarine gate
  • Slow down the melt with a gradually divergent flow area.
  • Reduce injection speed
  • Increase melt temperature

 

11. Weld Lines

SEBS - ELASTRON G101.A83.B - Troubleshooting For Injection - 11

  • Increase melt temperature: If two different flow meets together as colder than normal, such king of traces would be coming out.
  • Increase mold temperatures: Cold mold wall prevents the material flow.
  • Increase injection speeds: Lower injection speed causes premature cooling.
  • Increase venting: Ventilation supply us better flowing in the mold.