6253-3 | Jis K

Most common for general rubber products; used for values between 10 and 90. High-hardness rubber

For creep or relaxation studies, the standard allows recording hardness at longer indentation times (e.g., 15 or 30 seconds). jis k 6253-3

| Parameter | JIS K 6253-3 | ISO 7619-1 | ASTM D2240 | |-----------|--------------|-------------|-------------| | | Truncated cone, 0.79 mm tip | Identical | Identical | | Spring force tolerance | ±0.55 N at 100 scale | ±0.55 N | ±0.55 N | | Timing | 1 second (default) | 1 or 3 seconds | 1 second | | Mandatory stand | Not mandatory (but recommended) | Not mandatory | Not mandatory | | Stacking thin pieces | Allowed (max 3 layers) | Allowed | Allowed | | Result expression | Full scale 0–100 | 0–100 | 0–100 | Most common for general rubber products; used for

Standard tests are usually conducted at a controlled temperature of Measurement Method: Most common for general rubber products

Title: Mastering Rubber Hardness: A Deep Dive into JIS K 6253-3

Whether you are qualifying a new elastomer for a gasket, auditing a supplier in Osaka, or simply trying to match a failed rubber part, mastering ensures that your hardness numbers mean the same thing in Tokyo, Detroit, and Shanghai.