Factors affecting liquid silicone rubber products 2
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4. Tear strength
The resistance to propagation of a cut or score when force is applied to a notched specimen. Even if it is placed under extremely high torsional stress after being cut, the hot vulcanized solid silicone rubber will not be torn. The tear strength range of hot vulcanized solid silicone rubber is between 9-55 kN/m. The tear strength range of fluorosilicone rubber is between 17.5-46.4 kN/m. The tear strength range of liquid silicone rubber is between 11.5-52 kN/m.
5. Elongation
Usually refers to the "ultimate breaking elongation" or the percentage increase relative to the original length when the sample breaks. The general elongation range of hot vulcanized solid silicone rubber is between 90 and 1120%. The general elongation rate of fluorosilicone rubber is between 159 and 699%. The general elongation rate of liquid silicone rubber is between 220 and 900%. Different processing methods and hardener selection can greatly change its elongation. The elongation of silicone rubber has a great relationship with temperature.
6. Operation time
The operating time is calculated from the moment the vulcanizing agent is added to the colloid. There is actually no complete limit between this operation time and the subsequent vulcanization time. The colloid has already undergone a vulcanization reaction from the moment the vulcanizing agent is added. This operation time means that the 30-minute vulcanization reaction of the product can not affect the quality of the finished product. Therefore, the more time you save during product operation, the better it will be for the finished product.
7. Vulcanization time
Some places will say it is the curing time. In other words, after such a long time, the vulcanization reaction of silica gel is basically over. This basically means that the product is ready for use, but in fact there is still a small part of the curing reaction that has not yet ended. Therefore, products made of silicone rubber, such as silicone molds, usually need to be left for a period of time before being put into use.
