Based on its content, clarity, and industry acceptance, I would rate JIS K 6380 PDF as follows:
A typical designation under this standard follows a structure similar to:
Rubbers designed for ozone, outdoor, or specialized chemical exposure, such as Chloroprene (CR/Neoprene) or EPDM. 2. Hardness (Durometer)
The material's ability to resist swelling or deterioration when in contact with industrial oils (often tested against IRM903 test oil).
