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BJB Enterprises MD-50 REV 1 A/B

BJB Enterprises MD-50 REV 1 A/B is a series of semi rigid, medium work time urethane elastomers exhibit great flexibility and excellent durability. These tough, abrasion resistant systems easily process at room temperature.The MD Series is perfect for larger or more complex parts and offers superior performance in many applications such as rollers, foundry tooling and high impact semi rigid parts. For faster work times consider BJB’s FD Series of elastomers.

Polymer Name: Polyurethane Thermoset Elastomer (unspecified)

Features: Abrasion Resistant, Durable, Excellent Flexibility, Good Processability, Good Tear Strength, Good Toughness, High Performance, High Tensile Strength, Semi Rigid

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Identification & Functionality

Chemical Family
Technologies

Features & Benefits

Product Highlights
  • RoHS/REACH compliant
  • 2:1 user friendly ratio
  • High tensile and tear strength
  • Molds and cast parts
  • Cures at room temperature

Applications & Uses

Markets
Appliation Details

CURE SCHEDULE/HEAT CURING:

Most of the physical properties can be achieved in 5-7 days at 77°F (25°C). You may use your own post-cure schedule but the physical properties may vary from BJB’s cureschedule of 1-3 hours at 77°F (25°C) followed by16 hours at 160°F (71°C). Do not exceed curing temperature of 200°F (93°C).

PREPARATION AND RELEASING:

When MD-50REV 1A/B is used to produce molds or parts from plaster, wood or other porous substrates, we would first recommend that they besealed.Release agents may then be applied over the sealed surface.

ACCESSORIES:

BJB offers silicone RTV mold making materials along with a wide range of accessory items. These include de-airing agents, pigments, mold releases, and Jiffy®Mixers. Visit BJB’s website at www.bjbenterprises.com or consult a BJB representative for more information.

Properties

Physical Form
Appearance
Clear Amber
Physical Properties
ValueUnitsTest Method / Conditions
Hardness (Elevated Temperature Cure*)45 - 55Shore DASTM D2240-04e1
Density (Elevated Temperature Cure*)1.14g/ccASTM D792-00
Cubic (Elevated Temperature Cure*)25.1Inches per Pound
Tensile Strength (Elevated Temperature Cure*)4360psiASTM D412-98a(2002)e1
Tensile Modulus (Elevated Temperature Cure*)24800psiASTM D412-98a(2002)e1
Elongation (Elevated Temperature Cure*)510%ASTM D412-98a(2002)e1
Tear Strength (Elevated Temperature Cure*)450pliASTM D624-00e1
Shrinkage Linear (Elevated Temperature Cure*)TBDin/inASTM D2566 (1” depth)
Izod Impact notched (Elevated Temperature Cure*)min. 16ft-lb/inASTM D256-05
Dielectric Constant (1 MHz, Elevated Temperature Cure*)4.993ASTM D150-87
Dissipation Factor (1 MHz, Elevated Temperature Cure*)0.0599ASTM D150-87
Hardness (7 Day Ambient Cure)45 - 55Shore DASTM D2240-04e1
Density (7 Day Ambient Cure)1.14g/ccASTM D792-00
Cubic (7 Day Ambient Cure)25.1Inches per Pound
Tensile Strength (7 Day Ambient Cure)TBDpsiASTM D412-98a(2002)e1
Tensile Modulus (7 Day Ambient Cure)TBDpsiASTM D412-98a(2002)e1
Elongation (7 Day Ambient Cure)TBD%ASTM D412-98a(2002)e1
Tear Strength (7 Day Ambient Cure)TBDpliASTM D624-00e1
Shrinkage Linear (7 Day Ambient Cure)0.004*in/inASTM D2566 (1” depth)
Izod Impact Notched (7 Day Ambient Cure)TBDft-lb/inASTM D256-05
Dielectric Constant (1 MHz, 7 Day Ambient Cure)4.993ASTM D150-87
Dissipation Factor (1 MHz, 7 Day Ambient Cure)0.0599ASTM D150-87
Typical Properties
ValueUnitsTest Method / Conditions
Gel Time20 - 25 minutes
Mix Ratio by weight (Part A)100
Mix Ratio by volume (Part A)100
Specific Gravity (77°F (25°C), Part A)1.103
Color (Part A)Pale Yellow
Viscosity (77°F (25°C), Part A)4500Brookfield
Mixed Viscosity (77°F (25°C))2500cpsBrookfield
Work Time (100g mass, 77°F (25°C))15 - 20 minutes
Demold Time (77°F (25°C))3 - 4 hours
Mix Ratio by weight (Part B)50
Mix Ratio by volume (Part B)50
Specific Gravity (77°F (25°C), Part B)1.109
Color (Part B)Amber
Viscosity (77°F (25°C), Part B)440
Note
  • *Note: Reported physical properties are based on test specimens cured 1-3 hours at room temperature then 16 hours at 160°F (71°C).
  • +Shrink test specimens are cured for 24 hours at room temperature and then 16 hours at 160°F (71°C).
Note
  • *Note: Reported physical properties are based on test specimens cured 1-3 hours at room temperature then 16 hours at 160°F (71°C).
  • +Shrink test specimens are cured for 24 hours at room temperature and then 16 hours at 160°F (71°C).

Regulatory & Compliance

Certifications & Compliance

Safety & Health

Safty Precaution

Use in a well-ventilated area. Avoid contact with skin using protective gloves and protective clothing. Repeated or prolonged contact on the skin may cause an allergic reaction. Eye protectionis extremely important. Always use approved safety glasses or goggles when handling this product.

Packaging & Availability

Packaging Type

Storage & Handling

Storage

Store ambient temperatures, 65-80°F (18-27°C). Unopened containers will have a shelf life of 6monthsfrom dateof shipment when properly stored at recommendedtemperatures. Purge opened containers with dry nitrogen before re-sealing.