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The difference between silica gel hardness 60 and 70
The difference between silica gel hardness 60 and 70 is mainly reflected in the following aspects:
- Differences in physical characteristics
Tear strength: The tear strength of silica gel is related to hardness. In general, when the silicone hardness is higher than 40 degrees, the tearing strength will become worse, and the silicone products will become brittle and easy to break or break. Therefore, the tear strength of 60-degree silicone is usually better than that of 70-degree silicone. This is because lower hardness means the material is more elastic and more resistant to tearing.
Tear resistance: Although the tear resistance of 70 degrees silicone may be greater in theory than 60 degrees silicone (refers to the ability of the material to resist tearing, but here there is a contradiction with the expression of tear strength, because the tear strength is the actual performance, and the tear resistance is the material property, theoretically higher hardness of the material tear properties are stronger, But the actual performance may be because the hardness is too high to lead to increased brittleness and tear strength decreased), but in practical applications, because the 70 degree silica gel is harder, its brittleness also increases correspondingly, but may lead to a decrease in tear resistance. Therefore, when considering the degree of tear resistance, it is necessary to consider the balance of hardness and brittleness.
- Differences in the scope of application
Application scenario: 60 degree silicone due to its better elasticity and tear strength, more suitable for use in the need to withstand a certain tensile and tear stress, such as seals, shock pads and so on. The 70 degree silica gel is more suitable for occasions that require higher hardness and support, such as mold making and fixing of electronic products.
Processing performance: In the processing process, 60 degree silicone is easier to shape and cut due to its lower hardness, and the processing performance is better. The 70 degree silicone is relatively harder, and the processing is slightly more difficult.
- Other performance differences
Wear resistance: Silicone products with different hardness are also different in wear resistance. Generally speaking, silica gel with higher hardness has better wear resistance, but this also depends on the specific application environment and conditions. Therefore, in the choice of silicone hardness, it is necessary to weigh according to the actual use needs.
Elasticity: Elasticity is one of the important properties of silicone material. Due to its lower hardness, 60-degree silicone has better elasticity and can better adapt to objects of various shapes and sizes. The 70-degree silica gel is relatively harder and less elastic.
There are significant differences between silica gel hardness 60 and 70 in terms of physical properties, application range, and other properties. When selecting the hardness of silicone, it is necessary to comprehensively consider the specific application scenarios and needs to ensure that the selected silicone material can meet the requirements of use.
