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Grade: RT18XB
Formula: PMP TPX®
Form: Granule
Material: Polymethylpentene (PMP, TPX®)
Commodity: Polymers
Nominal Granule Size: 3mm
RT18XB PMP Granules offer enhanced stability and release performance in high-modulus formulations, maintaining the core characteristics of the RT18 series. Targeting applications in electronics, packaging, and cosmetic tooling, RT18XB is used in LED molds, thin-walled packaging, and complex release films. Its specialized formulation enables smoother demolding, clearer surfaces, and improved precision in replicated geometries. This grade supports innovation in polymer engineering and high-fidelity material processing. RT18XB exemplifies PMP’s role in enabling next-generation material technologies and contributes significantly to scientific and commercial product innovation. This material is trusted for its performance consistency, offering engineers and researchers a dependable solution in environments where thermal and chemical stability are critical. Its ability to withstand high processing temperatures and its compatibility with modern manufacturing techniques make it a standout choice across multiple sectors. TPX™ materials like this grade continue to drive progress in lightweight polymers, replacing heavier alternatives without compromising performance.
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Material Properties for Polymers

Chemical Resistance
Element Value
Acids - concentrated Good-Fair
Acids - dilute Good
Alcohols Good
Alkalis Good
Aromatic hydrocarbons Fair-Poor
Greases and Oils Good-Fair
Halogenated Hydrocarbons Fair-Poor
Halogens Fair-Poor
Ketones Good-Fair
Electrical Properties
Element Value
Dielectric constant @1MHz 2.12
Dissipation factor @ 1kHz 0.0002
Volume resistivity( Ohmcm ) >10¹⁶
Physical Properties
Element Value
Flammability HB
Refractive index 1.463
Resistance to Ultra-violet Poor
Limiting oxygen index( % ) 17
Water absorption - over 24 hours( % ) 0.01
Density( gcm⁻³ ) 0.835
Mechanical Properties
Element Value
Hardness - Rockwell R85
Elongation at break( % ) 15
Tensile modulus( GPa ) 1.5
Izod impact strength( J m⁻¹ ) 49
Tensile strength( MPa ) 25.5
Thermal Properties
Element Value
Heat-deflection temperature - 0.45MPa( C ) 100
Heat-deflection temperature - 1.8MPa( C ) 40
Lower working temperature( C ) 20
Upper working temperature( C ) 75-115
Specific heat( J K⁻¹ kg⁻¹ ) 2000
Thermal conductivity( W m⁻¹ K⁻¹ ) 0.17@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 117

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