Mitsui Plastics

EPICHLOMER™ (ECO)

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Mitsui Plastics
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EPICHLOMER™ (ECO) - Product Line Overview

Mitsui Plastics offers a line of high-performance epichlorohydrin (ECO) rubbers engineered to have superbly well-balanced properties. Produced from highly purified chlorine in a Japanese facility, these elastomers exhibit outstanding resistance to oils, fuels, and high temperatures, while maintaining superior flexibility even at low temperatures making them ideal for automotive components, seals, belts, specialty wires & cables, printer rollers, and more.

Our epichlorohydrin products hold the largest global market share, supported by nearly 50 years of production since 1979 and an integrated process — ensuring consistent quality and supply security for customers worldwide.

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Key Benefits & Advantages

  • High Purity & Stable Quality
    • Our elastomers, made from purified monomers in tightly controlled Japanese facilities, offer consistent quality, heat stability, low odor, and reliable performance in demanding environments.
  • Superbly Well Balance Properties
    • Designed for a wide range of industrial and automotive applications, it offers outstanding resistance to oils, fuels, and high temperatures, while maintaining superior flexibility even at low temperatures. Its exceptionally low volume resistivity, unique among synthetic rubbers, makes it ideal for printing roller use.
  • Customizable Performance
    • Our elastomers are offered in various grades, including homopolymer, copolymer, and terpolymer forms, enabling formulators to customize rubber properties to meet specific application requirements. These materials are well-suited for processes such as roll milling, extrusion, and calendaring.
  • Innovative FKM Curing Technology
    • A proprietary curing process ensures strong adhesion to fluoropolymers, enhancing longevity of multilayer hose assemblies.
  • Proven Track Record
    • Backed by nearly five decades of production experience and being widely used by global companies throughout the world, our elastomers have a long history of successful use various industries. This proven reliability gives customers confidence in consistent quality, supported by a global supplier recognized as the world’s top producers of epichlorohydrin rubber.
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Major Applications & Markets

  • Automotive
    • Fuel hoses, air inlet hoses, exhaust gas hoses, emission control hoses, PCV hoses, EGR hoses, air duct hoses, diaphragms, seals, filler hoses, evaporation hoses, ventilation hoses.
  • Office Automation (OA) Equipment
    • Rollers (charging, developing, transfer), belts, printer and industrial rolls.
  • Industrial
    • Oil and mechanical seals, gaskets, packings, industrial liners, freezer parts, food-quality impellers, specialty electric wires and cables, adhesives, sponges, permanent anti-static agents.
  • Household
    • Inner tubes for gas pipes, gas meter diaphragms.
Mitsui Plastics

Roles in Major Applications

  • Automotive hoses
    • Provides resistance to fuels, oils, and ozone; maintains flexibility at low temperatures; ensures long-term durability
  • OA equipment rollers
    • Offer controlled semi conductivity for precise electrostatic performance
  • Seals and gaskets
    • Deliver low gas permeability and chemical resistance for demanding environments
  • Industrial belts and liners
    • Withstands heat, oil, and mechanical stresses
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Technical Characteristics

  • Polymer Structure:
    • Ether linkages in the main chain (no double bonds) for stability and flexibility
    • Chlorine content provides fuel and oil resistance
    • Terpolymer grades include pendant allyl groups for enhanced ozone resistance and crosslinking versatility
Mitsui Plastics

Technical Properties

  • Specific Gravity: 1.20–1.37 (varies by grade)
  • Mooney Viscosity (ML 1+4, 100°C): 40–75
  • Chlorine Content: 14–37% (by grade)
  • Glass Transition Temperature (Tg): –26°C to –55°C
  • Volume Resistivity: 1×10⁷–1×10¹⁰ Ω·cm (semiconductive grades as low as 1.1×10⁷ Ω·cm)
  • Tensile Strength: Up to 17 MPa
  • Elongation at Break: Up to 810%
  • Hardness (Shore A): 68–72
  • Compression Set: As low as 17% after secondary vulcanization
  • Excellent oil and fuel resistance (low volume change in ASTM No.2 oil and Fuel C)
  • Low temperature flexibility: Tg as low as –55°C for certain grades

List of Product Grades Available

Grade Type/Series Specific Gravity Mooney Viscosity Chlorine Content (%) Tg (°C) Key Features
H Homopolymer 1.37 55 37 –26 General purpose, high oil resistance
C Copolymer 1.28 65 25 –45 Improved flexibility, lower Tg
D Copolymer 1.25 65 22 –49 Low resistivity, semiconductive
CG Terpolymer 1.26 50 24 –47 Enhanced ozone resistance
CG102 Terpolymer 1.24 55 21 –49 Semiconductive, OA rollers
CG104 Terpolymer 1.30 60 29 –41
CG105 Terpolymer 1.26 65 24 –47
CG107 Terpolymer 1.29 65 27 –43
CG109 Terpolymer 1.29 60 28 –42
DG Terpolymer 1.24 55 20 –50 Precision semiconductivity (OA)
EPION-301 Terpolymer 1.20 60 14 –55 Precision semiconductivity (OA)

 

*For detailed technical data and custom solutions, please send us an inquiry.

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