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EPTSEALER™ 685C-SERIES 685C | 686CEP | 686CT | 687C

EPTSEALER 685C is a soft-closed cell EPDM foam with excellent sealing properties. The closed cell structure combines a low compression load with good water & airtightness.

This unique foam can be laminated with Nitto’s advanced adhesive technology to seal complex gaps against water, wind, dust, noise and heat.

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Features

  • Closed cell structure
  • Soft & conformable
  • Low compression load 
  • Ozone resistance
  • Good weatherability
  • Fungus free in line with ISO 846
  • Excellent ageing performance (dimensional heat stability) 
  • Excellent water sealing
  • Good sound insulation
  • PFAS/PFOS free
  • RoHS and ELV directives compliant
  • Wide range of performing Tapes

Structure

  1. Semi-closed cell EPDM foam

(Can be combined with Nitto's adhesive technology)

Properties

685C Typical value* Test Method
Thickness 3 to 25 mm* ISO 1923
Density 130 kg/m³ ISO 845
Elongation MD** 450% ISO 1798
Tensile strength MD** 125 kPa ISO 1798
33% Compression Load 21 kPa Nitto Test Method
Water tightness (35%) No leakage Nitto U-shape ***
Chemical resistance Stable Immersion at 20 °C for 7 days
Test solution: acid (1%H2SO4) alkaline (1%NaOH), test performed on tensile strength and elongation acc. to ISO 1798.
Ozone resistance No cracks Visual inspection
Flammability (Ref 10mm) < 100 mm/min FMVSS 302
Dimensional stability: 7 days at 70°C ≤ 3% ISO2796

Product range

Product range Double coated tape Application
686C Acrylic adhesive, non-woven carrier General purpose
686CEP Acrylic adhesive, non-woven carrier High-end tape for low surface energy
686CT Acrylic adhesive, transfer tape More flexibility (complex shape)
687C Butyl adhesive, cloth carrier Greasy, rough and rubber base substrates

Properties

Complex Typical Value Test Method
Adhesion to 2B steel (90°) ≥ 400 cN/20mm EN 1939
Watertightness (30%) No leakage Nitto U-shape ***
Flammability (Ref 10mm) < 100 mm/min FMVSS 302
Temperature range

General: -40°C to 135°C 

687C: -40°C to 80°C

Dimensional stability
In case of extreme temperatures, we recommend to perform application tests
CAUTION: The above are typical values and should not be used in writing specifications. 

* Thicker material on request 

** MD machine direction 

*** Details from the test methods are described on the customer product specification.

Applications

EPT-Sealer 685C is specially designed for water sealing applications where a good weatherability and long-term exposure at high temperatures are required. Depending on the applications, the foam needs to be compressed by 5-35% to activate its sealing properties. 

AUTOMOTIVE – sealing of HVAC unit, dashboard, air duct, firewall, battery. 

HOME APPLIANCE – sealing of refrigerators, driers, washing machines. 

NEW ENERGY – sealing of heat pumps, air-conditioners, EV chargers, solar panels.

Contact Us

Customer Support Center

TEL +65-6223-8277

Business Hours(Australia time)08:30-17:00 Except for Sat, Sun, and Holidays

About NITTO's Support

Contact Us

Customer Support Center

TEL +65-6223-8277
Business Hours(Australia time)08:30-17:00
Except for Sat, Sun, and Holidays