FAQ
- What is the difference between urethane and rubber?
- Urethane is the industrial material which has the hardness of plastic and elasticity of rubber. It is made by mixing urethane material and hardening agent.
Rubber is made from many compounding agents (filling material, antiaging agent, plasticizing agent, cross-linking agent, etc.) and molded through cross-link process. - What is the difference between rubbers and rubber-sponges?
- Rubber-sponge is made of rubber, by adding chemical substances such as blowing agent, cross-linking agent, softening agent and fixing agent. In the sealed up and airtight space of mold die, through blowing process a number of independent bubbles are generated inside material by resolution of blowing substances.
Making different selection of main rubbers and by the portion balance of additional chemical substances, charactaristics of rubbers and rubber-sponges can be adjusted in a certain range. - How to read "Hardness" ?
- Larger number indicates “harder” both for Shore (for Urethane Rubber) and ASKER (for Sponge) material. (Ex. Urethane with Shore A95 is harder than urethane with Shore A30.)
*Hardness Guideline
- How is Shore measured?
- It is measured by Shore (Durometer) Hardness Test. The methods measure the resistance of rubbers toward indentation and provide an empirical hardness value.
- What "*ASKER C" refers too?
- ASKER is generally used for measuring hardness of sponges and flexible rubbers, since sponges are more flexible than rubber or urethane.
*The regulation of The Society of Rubber Industry, Japan (SRIS). - What is “A” in Shore A?
- Shore Hardness uses different measuring scale - Shore A or Shore D scale. A is for middle hardness, D for high hardness and E is for low hardness.
*The standard compliant with JIS K 6253 (New JIS) which was established in 1993 to align with ISO (International Organization for Standardization).
