Olefin-based dynamic crosslinked elastomers
Trexprene™ ™

ABOUT

Trexprene™ is a thermoplastic elastomer that blends an olefin resin matrix with crosslinked olefin rubber.
It offers a wide range of hardness levels and exhibits excellent compression set resistance, oil resistance, and heat resistance.
Taking advantage of its properties, it is used in automotive applications such as moldings, interior upholstery, and engine compartment components, and in industrial materials applications such as tool grips.
*As of April 2017, the low-hardness grade of "Thermorun™" has been renamed to "Trexprene™.

FEAUTURE

Features of Trexprene™

■We offer two types: a partially cross-linked type with low specific gravity and excellent moldability, and a fully cross-linked type with superior heat resistance, oil resistance, and rubber elasticity.
■A lineup ranging from low to medium hardness, with a rubber-like feel.
Duro hardness A40~
■Easy to mold and process.
- Can be molded using general-purpose extrusion and injection molding machines.
- Sprue and runners are recyclable.
■The fully cross-linked type offers excellent heat resistance and flexibility.
It can be used in environments with temperatures of 110-120°C.
■Fully cross-linked types have excellent rubber elasticity and superior sealing performance.
Compression set 20% ~
■ Partially cross-linked types have low specific gravity and excellent molded appearance.
■Heat fusion with olefin resins is possible.

Characteristics Comparison Table

Product lineup and physical properties table

Fully cross-linked TPV (low-pressure permanent strain)
Partially crosslinked TPV (low specific gravity, good molding)

Fully cross-linked TPV

A fully cross-linked olefin-based thermoplastic elastomer with excellent heat resistance, oil resistance, and rubber elasticity.

item	Test method	unit	A35BWJ	A45BWJ	A55BWJ	A64BWJ	A74BWJ	A80BWJ	D40BWJ	D50BWJ	reference: Vulcanized EPDM
Density	ISO 1183 reference	g/cm³	0.90	0.91	0.91	0.90	0.91	0.91	0.92	0.92	1.27
Duro hardness A (after 15 seconds)	ISO 7619-1 Reference	-	39	48	58	66	77	84	-	-	65
Duronic acid hardness D (after 15 seconds)	ISO 868 reference	-	-	-	-	-	-	-	45	55	-
Tensile stress at break	ISO 37 Reference 1A Test specimen, Test speed: 500 mm/min	MPa	2	3	5	5	8	9	19	22	9
Elongation during cutting	ISO 37 Reference 1A Test specimen, Test speed: 500 mm/min	%	320	330	580	270	390	390	650	630	310
Compression permanent set (70℃, 22h)	ISO 815 reference*	%	20	22	26	24	29	33	50	67	11
Compression permanent strain (120℃, 22h)	ISO 815 reference*	%	30	26	34	32	42	49	75	82	47
Oil swelling resistance, weight change (IRM903, 120℃, 70h)	MCC Test Method	wt%	118	116	127	94	83	75	53	38	62
Molding shrinkage rate MD direction 1/1000	MCC Test Method 3mmt	-	42-47	30-35	18-23	25-30	18-23	15-20	10-15	10-15	―
Molding shrinkage rate TD direction 1/1000	MCC Test Method 3mmt	-	4-9	4-9	8-13	7-12	8-13	9-14	10-15	10-15	―

*The above figures are representative values and not guaranteed values.

*Measurements were taken with a 25% compression.

Issued:Sep.2025

List of physical properties of fully crosslinked TPV

Partially crosslinked TPV

Partially crosslinked olefin-based thermoplastic elastomer with excellent moldability and weather resistance.
Grade for injection molding

item	Test method	unit	3555NJ	3555BJ	3655NJ	3655B	3755NJ	3755BJ	3855NJ	3855BJ	3981N	3981B
Density	ISO 1183 reference	g/ cm³	0.89	0.88	0.88	0.89	0.88	0.89	0.89	0.89	0.89	0.89
MFR (230℃, 49N)	ISO 1133 reference	g/10min.	1	1	19	13	4	6	11	22	25	21
Duro hardness A (after 15 seconds)	ISO 7619-1 Reference	-	52	53	62	66	73	74	83	87	89	89
Tensile stress at break	ISO 37 Reference 1A Test specimen, Test speed: 500 mm/min	MPa	5	5	7	6	9	9	10	14	12	13
Elongation during cutting	ISO 37 Reference 1A Test specimen, Test speed: 500 mm/min	%	600	600	680	650	720	750	670	780	680	700
Compression permanent set (70℃, 22hr)	ISO 815 reference*	%	35	38	43	44	45	46	49	56	51	51
Molding shrinkage rate in the MD direction	MCC Test Method 2mmt	%	2.1	2.1	1.5	1.6	1.5	1.5	1.4	1.3	1.3	1.3
Molding shrinkage rate (TD direction)	MCC Test Method 2mmt	%	1.3	1.3	1.3	1.3	1.3	1.3	1.3	1.3	1.5	1.5
color	-	-	Ending in N and NJ: milky white (natural), Ending in B and BJ: black

*The above figures are representative values and not guaranteed values.

*Measurements were taken with a 25% compression.

Issued:Jun.2025

Extrusionmolding grade

Test items	Test method	unit	QT60MB	QT70HG	QT80HG	QT85KD
MFR (230℃, 49N)	ISO 1133 reference	g/10min.	2	3	9	6
Density	ISO 1183 reference	g/cm³	0.91	0.91	0.91	0.91
Duro hardness A (after 15 seconds)	ISO 7619 reference	－	57	67	78	87
Tensile stress at break	ISO 37 Reference 1A Test specimen, Test speed: 500 mm/min	Mpa	6	7	9	11
Elongation during cutting	ISO 37 Reference 1A Test specimen, Test speed: 500 mm/min	%	640	640	690	680
Compression permanent set (70℃, 22hr)	ISO 815 reference*	%	40	49	53	55
color	-	-	black

*The above figures are representative values and not guaranteed values.

*Measurements were taken with a 25% compression.

Issued:Aug.2025

List of properties of partially crosslinked TPV

Recommended molding conditions

For the export of chemical products, we will check the regulations of each country and then respond regarding whether or not we can provide them.
Please be sure to include information such as the exporting country.
Please note that for some products, we may not be able to offer or provide a different grade.

CASE

Application example

CONTACT

Before you start worrying about selecting and developing resin materials
Please contact Mitsubishi Chemical.

Polymer Compounds Business Group Products
Useful resources are available here.

Documents

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Please contact us.

Inquiry

The above information is based on the latest available information as of the date of creation and may be revised in the future based on new information.

Furthermore, this information is provided as general technical information and reference material, and we do not guarantee the accuracy or completeness of the content.

Product performance and characteristics may vary depending on usage conditions, processing conditions, etc. The final decision regarding applicability and design is the customer's responsibility.

We will check the regulations of each country regarding the export of chemical products and then respond whether or not we can provide them. Please be sure to include information such as the exporting country.

Depending on the product, we may suggest a different grade or may not be able to provide the product at all.

Mitsubishi Chemical Corporation
Polymer Compounds Business Group

Inquiry

Olefin-based dynamic crosslinked elastomersTrexprene™ ™

Features of Trexprene™

Characteristics Comparison Table

Product lineup and physical properties table

Fully cross-linked TPV

Partially crosslinked TPV

Recommended molding conditions

Application example

Automotive interior materials

Oral care

Sports Grips

Before you start worrying about selecting and developing resin materialsPlease contact Mitsubishi Chemical.

Olefin-based dynamic crosslinked elastomers
Trexprene™ ™

Before you start worrying about selecting and developing resin materials
Please contact Mitsubishi Chemical.