Zeon KASEI Co., Ltd.


Housing Material Products

SANDAM Base Isolation Rubber

This product features the excellent characteristics of synthetic rubber.
This product is developed as a wooden structure foundation material with the superior durability, heat resistance and shock absorption of synthetic rubber.
This product increases the durability of buildings and protects valuable homes.

This product features the excellent characteristics of synthetic rubber.

Long-lasting material with superior resistance to deterioration
The ultimate cause of rubber deterioration is ozone. SANDAM Base Isolation Rubber passed ozone weather resistance tests rated for 30 years (JIS K6259), showing the durability of synthetic rubber.
In addition, as a result of testing under much severer conditions, this product was judged to be durable for 100 years or more under actual use. This product also passed the deterioration testing based on the standards for bridge support rubber durability.

Rubber never becomes misaligned.
Coefficient of friction is 0.7 without load on concrete (*In-house evaluation).
Converting the value into acceleration, it becomes 686gal, meaning misalignment will not occur even at an earthquake intensity of 7 on the Japanese scale (approx. 400gal) without load.

Heat-resistant property exceeding wood
This product has passed heat resistance tests of 1 hour at 300°, exceeding the 270° ignition point of wood.

Tremendous shock absorption
This product was rated at 2.9% in impact resilience testing (JIS K6255), which means that it absorbed 97.1% of the impact energy.

Superior resistance to chemicals
This product did not show any abnormalities in chemical resistance testing (5 hour immersion) for civil engineering and construction materials in compliance with the Japanese Industrial Standards (JIS).
(* All values are obtained by in-house evaluation.)
Test Data
Test Items Measured Values Unit Remarks
Tensile Strength 24.7(252) MPa(kg/cm2) Maximum Stress until Fracture in Tensile Test
Tensile Stress 4.4(45) MPa(kg/cm2) Rubber Stress at Elongation Percentage of 100% (Resilience)
17.7(181) MPa(kg/cm2) Rubber Stress at Elongation Percentage of 300% (Resilience)
Elongation 445 % Maximum Stress at Fracture in Tensile Test
Impact Resilience 2.9 % Residual Percentage of Impact Energy Absorption
Compressive Strength 196(2000) MPa(kg/cm2) Load until Test Sample Wood Limit Value (2t)
Thermal Deformation Normal - Observing the form and measuring the size after 1 hour heating at 300°
Chemical Resistance Normal - JIS K6745
Static Coefficient of Friction 0.7 - Static coefficient of friction with concrete surface without load
Ozone Resistance Test Normal -
  1. 40°/ Ozone concentration 25pphm/ Elongation 20%/ 30 days
  2. 240°/ Ozone concentration 50pphm/ Elongation 20%/ 30 days
(*These are values obtained by the in-house evaluation by test methods in compliance with Japanese Industrial Standards (JIS) but are not guaranteed.)

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