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.
One. physical property
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.
Two. 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.
Three. Product Features
1. Squeezing strength: Low hardness products will gradually decrease in force, while high hardness will increase.
2. Tear resistance: The higher the hardness, the weaker the product's tear resistance, and the lower the hardness, the better the tear resistance.
3. Tensile force: It has a certain correlation with hardness and affects the deformation of the product.
4. Wear resistance and fatigue degree: As the hardness increases, long-term running in will affect the decrease of fatigue degree and the phenomenon of insufficient wear resistance.
5. Elasticity: Silicone with different hardness has different elasticity, which affects the effectiveness of product use.
Overall, the classification level, measurement method, and application field of silicone hardness vary. High hardness silicone with a hardness of 40-100 ° A is suitable for fixture molds and precision parts. Due to its high hardness, lack of elasticity, and resistance to deformation, it can perfectly replicate fine patterns. Medium hardness silicone with 10-30 ° A is widely used in the production of simple small mold pieces, such as soap, candle, and food molds, with good tear resistance and reusability. 0 ° A low hardness environmentally friendly silicone is suitable for making drop glue DIY molds and human body models. Due to its low hardness, good elasticity, and easy foaming, it can replicate exquisite patterns. The choice of different silicone hardness depends on the requirements and usage scenarios of the mold, ensuring the production effect and quality of the mold. We choose products with suitable silicone hardness according to specific needs in order to better meet the needs of different fields.
