The hardness of liquid silicone ranges from 0 ° A to 100 ° A, with a unit of every 5 degrees in between. Liquid silicone at each hardness has different uses. Here we introduce additive silicone, which is one of the types of liquid silicone. Generally, the hardness of additive liquid silicone is divided into high hardness, medium hardness, and soft hardness. Below, we will introduce the uses of silicone that match different hardness levels.

Elongation and tensile strength of silicone:
Very soft silicone (0 ° A): has high elongation and low tensile strength, with low tear strength and high elongation of mold silicone.
Soft silicone (5-10 ° A): Moderate elongation and tensile strength, suitable for various applications.
Medium hardness silicone (20-30 ° A): harder than soft silicone, but also has some elasticity and compressibility.
Slightly hard silicone (40-50 ° A): Moderate hardness, with certain elasticity and compressibility.
Hard silicone (60-90 ° A): Very hard, with excellent wear resistance and high temperature resistance.

Application area
1. Very soft silicone: suitable for applications that are soft, curved, stretchable, or swinging, such as children's toys, models, etc.
2. Soft silicone: suitable for making soft gaskets, sealing gaskets, automotive parts, etc.
3. Medium hardness silicone: commonly used for electronic product casings, protective cases, etc.
4. Slightly hard silicone: can be used for automotive seals, molds, anti slip pads, etc.
5. Hard silicone: suitable for making injection molds, various joints, sealing rings, wear-resistant parts, etc.
6. Super hard silicone: usually used in fields such as high temperature resistance, acid and alkali resistance, and wear resistance.

About injection liquid silicone rubber,please check the details: High Strengh Liquid Silicone Rubber IOTA 28-Series