How to Choose the Right Silicone Hardness

Silicone hardness is measured on the Shore A scale. A lower number means a softer part. Choosing the right hardness affects how the part feels, how well it seals and how long it lasts.

A rough guide

• Around 20 to 40 Shore A. Very soft and flexible. Used for soft-touch products, pads and grips.
• Around 40 to 60 Shore A. A common range for kitchen products, baby products and many general parts.
• Around 60 to 80 Shore A. Firmer parts that hold their shape, such as many seals, gaskets and buttons.

These ranges are a starting point, not a rule. The best value depends on the product and how it is used.

Questions to ask yourself

• Should the part feel soft or firm in the hand?
• Does it need to seal against a surface, and with how much pressure?
• Will it be pressed often, like a button?
• Will it hold its own shape, or be stretched?

If you are not sure, send us a sample or tell us how the part will be used. We can suggest a hardness and make samples in two or three values for you to compare.