TPX RT31 – Transparent Heat-Resistant PMP Resin by Mitsui Chemicals

TPX RT31 (also referred to as RT31XB) is a transparent polymethylpentene (PMP) copolymer resin manufactured by Mitsui Chemicals, Inc. – the world‘s sole producer of TPX brand PMP resins. As an authorized distributor and trader, we supply genuine material with full traceability and direct access to official Mitsui Chemicals technical documentation. For more product options and company information, please visit our website at https://szrqchem.com/.

TPX is a crystalline polyolefin made from 4-methylpentene-1, produced by Mitsui Chemicals’ special technology of molecular design and catalyst. TPX RT31 is a low density, heat resistant, high modulus polymethylpentene that offers an exceptional combination of properties:

• Excellent transparency equivalent to glass and acrylic

• High melting point for use at elevated temperatures

• One of the lightest polymer materials among thermoplastics

• Superior releasability

• Excellent chemical & steam resistance with high durability against acid, alkali and alcohol

TPX RT31 is certified for food packaging materials by Japan Hygienic Olefin and Styrene Plastics Association (JHOSPA) , United States Code of Federal Regulations Title 21 (FDA) and EU Regulation (EU) 10/2011.

Recommended for injection molding and also applicable for extrusion processing by T-Die casting, profile, mandrel, pipe and fiber spinning.

Key Features of TPX RT31

• Lowest Specific Gravity Among Plastics – Density of only 0.833 g/cm³ – one of the lightest polymer materials among thermoplastics

• Superior Optical Clarity – Light transmittance of 94% with haze as low as 0.8%; refractive index of 1.46

• High Heat Resistance – Melting point of 235-237°C; Vicat softening point of 174-177°C; DTUL @ 66 psi of 127°C

• High Modulus / Rigidity – Tensile modulus of 1,903 MPa; flexural modulus of 1,600 MPa

• Excellent Release Properties – Superior releasability

• Chemical & Steam Resistance – Excellent durability against acid, alkali and alcohol

• Excellent Electrical Properties – Low dielectric constant of 2.12 at 1MHz; volume resistivity >10¹⁶ Ω·cm

• High Gas Permeability – Exhibits high gas permeability

• Low Refractive Index – Refractive index of 1.46 equivalent to fluororesin

• FDA Compliant – Certified for food contact applications per FDA 21 CFR

• Versatile Processing – Suitable for injection molding, film extrusion, blow molding, and fiber extrusion

• UL 94 HB – UL 94 flammability rating of HB

Typical Applications for TPX RT31

Typical Properties

Important Notes on Typical Data:

• Values listed are typical and sourced from Mitsui Chemicals official data sheets. They do not constitute binding product specification.

• Batch-to-batch deviations may exist. For critical applications, validate performance with batch-specific COA certificate.

• Final performance depends on processing conditions, mold design, and part geometry.

• Mitsui Chemicals official TDS shall serve as definitive technical reference. Request the latest official TDS from our sales team.

Processing Guidelines

Critical Processing Warnings:

• Drying: TPX RT31 is not hygroscopic and typically does not require drying. If moisture is a concern, dry at 80-100°C for 2-3 hours.

• Gate Design: Pin gate is the most suitable for TPX molds due to excellent flowability. Avoid large gates that can cause residual stress and gate cracks.

• Cooling: Sufficient and well-balanced cooling channels are essential due to TPX’s crystalline nature and larger shrinkage compared to amorphous polymers.

• Surface Finish: Highly polished mold surface is recommended for excellent transparency.

• Shrinkage: Mold design should account for higher shrinkage (MD: 1.5-2.1%, TD: 1.2-1.7%). Off-center gates are recommended to prevent warpage.

• Regrind: Regrind can be used up to 20-30% with virgin material, provided it is clean and properly dried.

Related Products

• Explore TPX Transparent Resins – Browse all TPX resin options

• Explore Engineering Plastics – Browse all engineering plastic materials

• About Our Company – Learn more about our supply capabilities and quality assurance

Technical Documents

Request any document above by:

• Email: ruiqingchem@gmail.com

• Online form: Our contact page

We reply within one working business day. Please clearly state product (TPX RT31) and document type you require.

FAQ

Q1: What is TPX RT31 and what is it used for?
A: TPX RT31 is a low density, heat resistant, high modulus polymethylpentene (PMP) resin manufactured by Mitsui Chemicals. It combines excellent transparency equivalent to glass and acrylic, high melting point, superior releasability, and chemical resistance. It is widely used in LED molds, release films for FPC, food containers, medical devices, rubber hoses, and release paper for synthetic leather.

Q2: What is the difference between TPX RT31 and TPX RT18?
A: TPX RT31 has a slightly lower MFR (21 g/10min vs 26 g/10min at 260°C, 5kg), indicating higher molecular weight and potentially better mechanical properties. RT31 also has slightly higher Vicat softening point (174-177°C vs 173°C). Both share similar density, light transmittance, and FDA compliance.

Q3: Is TPX RT31 FDA compliant?
A: Yes. TPX RT31 is certified for food packaging materials by United States Code of Federal Regulations Title 21 (FDA), Japan Hygienic Olefin and Styrene Plastics Association (JHOSPA), and EU Regulation (EU) 10/2011.

Q4: What is the density of TPX RT31?
A: The density is 0.833 g/cm³, making it one of the lightest polymer materials among thermoplastics.

Q5: What is the light transmittance of TPX RT31?
A: The light transmittance is 94% with haze of only 0.8-0.9%.

Q6: What processing methods can be used for TPX RT31?
A: TPX RT31 is recommended for injection molding and is also applicable for extrusion processing by T-Die casting, profile, mandrel, pipe and fiber spinning.

Q7: What is the MFR of TPX RT31?
A: The Melt Flow Rate is 21 g/10min at 260°C, 5kg.

Q8: What are the key advantages of TPX RT31?
A: Key advantages include low density (0.833 g/cm³), high transparency (94%), high heat resistance (MP 237°C), superior releasability, excellent chemical & steam resistance, FDA compliance, and high modulus/rigidity.

Q9: What is the lead time for orders?
A: Regular orders ship within 7-10 working days after payment confirmation. Large-volume or urgent orders can be negotiated separately.

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Sample Policy:

• Samples are for laboratory validation tests only, not for production use.

• Buyer bears international sample-shipping freight.

• If bulk-product performance deviates from sample reference, Mitsui Chemicals official TDS serves as the authoritative benchmark.

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Disclaimer

DISCLAIMER: All technical data is referenced from original Mitsui Chemicals typical values for TPX RT31. Our company acts as authorized distributor/trader rather than original manufacturer. Final performance depends on processing conditions, mold design, and part geometry. Buyers shall independently validate product suitability for individual applications. Our firm bears no liability for product failure caused by improper processing or improper usage. Always reference the latest Mitsui Chemicals official TDS of TPX RT31 as the definitive specification.