About NITTO EPTSEALER

NITTO EPTSEALER fills various types of gaps, to shut out heat, water, sound, or vibration. Highly functional sealing properties have been developed by blending EPDM rubber foam, which offers the best durability among general rubber material, with Nitto Denko’s unique adhesive technology. Superior resistance to heat and chemicals allows stable and consistent performance over long periods of time. A wide range of types are available depending on usage, from flame retardant to soft or high-compression. The superior performance of NITTO EPTSEALER is recognized by various domestic and international industries, and is used in automotives, housing, and home appliances.

Features

The main constituent is EPDM rubber foam, which boasts superior heat and chemical resistance (to acids and alkalis) compared to general purpose rubbers.
Excellent foaming technology enables control of expansion from 3 to 20 times the original size.
Variety of cell structures, such as closed, semi-closed and open cells, are available with Nitto Denko’s extensive foaming process technology.

Structure

Properties

Heat-resistance

Test specimens prepared using a #1 dumbbell die were exposed to each temperature condition. At the end of each time interval, the test pecimens were stretched at the rate of 500mm/min., and the maximum elongation before rupture was measured. Retained elongation was calculated as a percentage of the new specimen’s elongation. Measurement temperature: 80°C

Water-tightness

Compression[%]	Leakage condition
Compression[%]	No.6800	No.685	EE-1000
50	○	×	×
60	○	△	×
70	○	○	△
80	○	○	○

○：No leakage after 30min.　△:Leakage within 30min.　×:Leakage within

【Test method】

U-shaped 10mm wide test specimens were punched out and placed between acrylic and aluminum plates for compression to a press load. The test specimens were then filled with water to a depth of 100mm and checked for leakage.

Chemical Resistance

Compression[%]	Tensile strength[N/cm²]
Compression[%]	No.6800	No.685	EE-1000
Initial	35	10	8
Acid(1%H2SO4)	30	10	7.5
Alkali(1%NaOH)	36	9.8	7.1

*20℃×168himmersion

Comparison of Weather Resistance

Each test specimen was placed in a sunshine carbon weather meter and taken out after a set time to measure the elongation by stretching at 500mm/min. Retained elongation was calculated as a percentage of a new specimen’s elongation.