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GEHR PBT® is a semi-crystalline material from the polyester family of plastics and, due to its good thermal and mechanical properties, is counted among the polymer group of engineering plastics. It has a high surface hardness and good sliding and wear behavior.

Polymer Name: Polybutylene Terephthalate (PBT)

Physical Form: Custom, Rods

Features: Anti-Wear Properties, Chemical Resistant, Creep Resistant, Dimensional Stability, Easy To Paint, Electrically Insulating, Excellent Surface Hardness, Excellent Toughness, Good Mechanical Properties, Good Sliding Properties, Good Thermal Stability, Good UV Resistance, Good Weather Stability, High Hardness, High Stiffness, Semi Crystalline

Density: 1200.0 - 1350.0 kg/m³

Color: Natural

Technical Data Sheet
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Knowde Enhanced TDS

Identification & Functionality

Technologies

Features & Benefits

Properties
  • High stability, stiffness and toughness, even at low temperatures
  • Good creep resistance
  • High surface hardness
  • Good polishability
  • High dimensional stability
  • Easy to metallize
  • Good sliding properties
  • Good electrical insulation characteristics
  • High resistance to chemicals
  • Easy to paint
  • Good UV and weather resistance
  • Sensitive to hydrolysis

Applications & Uses

Plastics & Elastomers Processing Methods
Applications
  • Components with metal inserts
  • Pump components
  • Housing components
  • Tank caps
  • Gear wheels
  • Insulating parts in electrical engineering
  • Applications with UV exposure
  • Fixings and spacers
  • Guide rails and wheels, sliding bearings
  • Pump and sealing bodies, roller conveyors
  • Valves

Properties

Color
Flame Rating
Physical Form
Form and Condition
Rods. Sheets / Solid
Odor
Odorless
Insoluble in
Water
Mechanical Properties
ValueUnitsTest Method / Conditions
Tensile Strength at Yield68MPaISO 527
Elongation at Yield (S)8%ISO 527
Tensile Strength at Break61MPaISO 527
Elongation at Break (R)15%ISO 527
Impact Strength (an)231kJ/m2ISO 179
Notch impact Strength (ak)3kJ/m2ISO 179
Ball Indentation (Rockwell Hardness)166MPaISO 2039
Hardness83Shore DISO 868
Flexural Strength (B 3,5 %)82MPaISO 178
Modulus of elasticity (Et)3005MPaISO 527
Physical Properties
ValueUnitsTest Method / Conditions
Specific Gravity1.33ISO 1183
Water Absorption0.4%ISO 62
Humidity Absorption0.25%ISO 62
Maximum Permissible Service Temperature130°CUL746B
Lower Permissible Service Temperature-60°CUL746B
Thermal Properties
ValueUnitsTest Method / Conditions
Vicat Softening Point (VST/B/50)219°CISO 306
Vicat Softening Point (VST/A/50)200°CISO 306
Heat Deflection Temperature (HDT/B)170°CISO 75
Heat Deflection Temperature (HDT/A)58°CISO 75
Coefficient of Linear Thermal Expansion0.9K-1.10-4ISO 11359
Glass Transition Temperature (Tg)143°CISO 3146
Glass Transition Temperature (Tg)50°CISO 3146
Melting Temperature (Tm)223°CISO 3146
Typical Properties
ValueUnitsTest Method / Conditions
Density1.2 - 1.35g/cm³
Melting Temperature (ca)220 - 230°C
Thermal Decompositionmin. 290°C
Electrical Properties
ValueUnitsTest Method / Conditions
Volume Resistivitymin. 10^13Ω.cmIEC 60093
Surface Resistivity (Ro)min. 10^13ΩIEC 60093
Additional Information
ValueUnitsTest Method / Conditions
BondabilityYes--
FlammabilityHB-UL 94
Limiting Oxygen Index (LOI, 9)24%ASTM D2863
UV Stabilisation (6, 9)Yes--

Regulatory & Compliance

Certifications & Compliance

Technical Details & Test Data

Fire-fighting Measures

Suitable extinguishing agents

Water, foam, dry chemical, carbon dioxide (CO2).

Potential combustion products

Carbon dioxide (CO2), carbon monoxide (CO). Formation of further decomposition and oxidation products depend upon the fire conditions. Under special fire conditions traces of other toxic substances are possible.

Special protective equipment

Wear a self-contained breathing apparatus. If exposed to combustion fumes bring the victim into fresh air.

Further information

Dispose of fire debris and contaminated extinguishing water in accordance with official regulations..

Safety & Health

Safety Measures

The general industrial safety measures should be considered. A thermal damage during machining should be avoided.

Storage & Handling

Machining

The product can be machined with standard machinery and tools. Before machining the product should be stored at room temperature 24 h. Evacuate swarf to prevent slipping or tripping. Observe the maximum allowable concentration of dust and formaldehyd levels on the working area which apply in your country. Wear safety goggles during machining. General dust limit value: Respirable dust (6 mg/m3); Inhalable dust (10 mg/m3 ).

Storage

The products shall be stored indoor to keep away from any source of degradation such as sunlight, UV-jets, ionizing radiation, chemicals.