1. HIRAKATA GIKEN
  2. data
  3. Basic Data and Physical Properties of NonBuren Anti-Vibration Materials
Last Modified: Published: October 2024

General Performance (Physical Properties)

Item S15 S30 S40 S50 S70 Remarks (JIS No.)
Specific Gravity 1.03 1.03 1.08 1.08 1.08 K6911
Hardness (Rubber Hardness) Hs0 Hs17 Hs25 Hs30 Hs50 K6301 #A
Hardness (Sponge Hardness) C15 C30 C40 C50 C70 K7312
Tensile Strength (Kg/cm2) 8.17 8.48 12.6 22.3 43.9 K6301 #3
Elongation Stress (Kg/cm2)
100% Elongation Stress 0.75 1.52 1.73 3.78 7.95
200% Elongation Stress 1.02 2.08 2.56 5.40 11.3
300% Elongation Stress 1.21 2.46 3.31 6.62 13.7
Elongation (%) 1050 1000 950 775 575
Permanent Elongation (%) 1.0 0.5 0.5 0.5 0.3 K6301 300%
Stress Relaxation After 1 Min 6.3 7.0 - 11.0 - K6301 200%
Stress Relaxation After 5 Min 8.4 10.0 - 12.6 -
Compressive Strength (Kg/cm2) K6911
At 10% Strain 0.55 0.69 1.42 2.77 6.40
At 20% Strain 1.11 1.52 2.85 6.06 13.0
At 30% Strain 1.80 2.63 4.73 10.7 21.3
Elastic Modulus (Kg/cm2) 5.54 7.62 14.2 33.2 69.2
Tear Strength (Kg/cm2) 3.19 3.37 7.56 11.8 14.8
Tear Deformation (mm/50mm) 425 370 310 230 125
Item S15 S30 S40 S50 S70 Remarks(JIS No.)
Heat Aging Test(80℃)
Tear Strength(Kg/cm2) 7.76 8.40 13.0 22.5 24.1
100% Elongation Stress 0.74 1.55 1.75 3.89 8.11
Elongation (%) 1000 1000 950 775 575
Permanent Compression Strain (%)
70℃,22hr 4.5 2.8 1.0 0.8 0.2
100℃,70hr 7.6 5.8 4.3 2.8 2.3
Compression Fatigue (10000 Times) pass pass pass pass pass K6301 50%
Water Absorption Rate(W/V%) K7209
Room Temperature 24hr 0.88 0.86 0.84 0.68 0.53
Room Temperature 72hr 1.38 1.28 1.20 0.87 0.62
40℃ 24hr 1.53 1.44 1.21 1.04 0.89
40℃ 72hr 1.84 1.62 1.42 1.25 1.02
Boiling Water 24hr 2.13 1.82 1.45 1.33 1.11
Boiling Water 72hr 2.35 2.12 1.63 1.58 1.39
Oil Resistance (W/V%) K7209(Lubricant Oil No.1)
40℃ 24hr -3.7 -3.4 -1.4 +0.3 0.1
40℃ 72hr -4.3 -4.0 -2.0 +0.5 +0.1
Cols Resistance (-30℃) pass pass pass pass pass K6301
Thermal Conductivity (Kcal/mhc) 0.135 0.139 - 0.143 - Kyoto Electronic TC-12

Chemical Resistance Testing of NonBuren

Chemical Name Effect
1% Sulfuric Acid ◎
1% Hydrochloric Acid ◎
1% Caustic Soda ○
Calcium Hydroxide ◎
Sea Water ◎
Alcohol ○
Acetone x
Toluene x
Chlorinated Solvents x

W.H.Adams Evaluation Standards（%）（Weight Change / 60℃ 28day）
◎：-2～2%　○：-2～-3,2～14%　△：-3～-4,14～19%　x：-4 以下, 19% or more

Test Standards
JIS K7114
Measured Items
Weight Change %
Test Piece
□50 x t3mm Sheet Punching (JIS K720g Standard)
Tested Product No.
NonBuren S15, S30, S40, S50, S70
Evaluation Method
Following W.H. Adams Evaluation Standards.
Chemical Name S15 S30 S40 S50 S70
Inorganic Acid 1% hydrochloric acid ◎ ◎ ◎ ◎ ◎
1% sulfuric acid ◎ ◎ ◎ ◎ ◎
Organic Acid 1% acetic acid ○ ○ ◎ ◎ ◎
Alkali 1% caustic soda ◎ ◎ ◎ ◎ ◎
5% ammonia ○ ◎ ◎ ◎ ◎
Sea Water ◎ ◎ ◎ ◎ ◎
Heavy Oil ○ ◎ ◎ ◎ ◎
Solvent Ethanol ○ ○ ○ ◎ ◎
Acetone ×* ×* ×* x △
Toluene ×* ×* ×* x △
Hexane ◎ ◎ ◎ ◎ ◎
Trichloroethylene ×* ×* ×* ×* ×*

* swelling failure"

Symbol Evaluation Weight change range
◎ Excellent within 2%
○ Good -2～-3,2～14%
△ Poor -3～-4,14～19%
x Fail below -4, above 19%

Compression Set of NonBuren

Test Standards
JIS K6301 Physical Testing Methods for Vulcanized Rubber
Measured Items
25%
Test Piece
φ29 x t12.7mm mold casting production
Tested Product No.
NonBren S15, S30, S40, S50, S70
Evaluation Method
After heat treatment at 70℃ for 22 hours and at 100℃ for 70 hours, measurements are taken after leaving it at room temperature for 30 minutes.
Part Number Test Condition
70℃ 22 hours 100℃ 70 hours
S15 4.5% 7.6%
S30 2.8 5.8
S40 1.0 4.3
S50 0.8 2.8
S70 0.2 2.3

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