Hardness of seal materials like rubbers, elastomers and plastics are typically measured in units of Shore or IRHD (International Rubber Hardness Degrees). The Shore scales are widely used in the United States and were devised by Albert F. Shore in the 1920s.
Shore Hardness values provide a common reference point when comparing different materials. There are 12 different scales for measuring substances with varying properties, including thermoplastic elastomers, thermoset rubber, elastomeric materials, cellular materials, gel-like materials and some plastics. Each scale ranks hardness values between 0 and 100, with higher values indicating higher hardness.
You might don’t know this professional products knowledge.
Long story short, PVC foam board with higher Shore hardness are better.
This is our 0.45 density 19mm PVC foam board sample, you can see its Shore hardness has reached 66HD.
https://www.pvccabinetsheet.com/
