13 tips for extending the life of silicone rubber mold
In the process of making silicone rubber mold, every manufacturer hopes the life of silicone rubber mold as long as possible. Therefore, in order to help more people to solve this problem, there are 13 tips to extend the life of silicone rubber mold.
1. Choose the suitable hardness according to the detail level of the pattern.
In general, the hardness is 10~30 shore A, the higher the hardness, the better the quality.
The hardness is more than 30 shore A, the higher the hardness, the worse the quality.
2. Choose pouring way or brushing way according to the size of product.
For large size products, the brushing way is suitable for making molds, which can help you save the cost.
For small size products, the pouring way is suitable, which can help you save time and easy to operate.
But if you make molds for large size products with brushing way, you can paste a few layers of fiber glass cloth to increase the toughness and strength of silicone robber molds.
3. Choose the suitable hardness according to the size of products.
In principle, The hardness of silicone rubber is proportional to the size of product. For the small size products, the softer silicone rubber is more appropriate. Otherwise, the higher hardness of silicone rubber is more suitable for large size products.
4. The silicone rubber and curing agent should be stirred evenly.
If the mixture of silicone rubber and curing agent is not stirred evenly, it will not cure completely.
5. Vacuum pumping.
It is necessary to release the bubbles to extend the life of silicone rubber molds.
6. Increase the thickness of silicone molds.
As we all know, the thicker the mold, the better the anti-tearing strength. If the mold is too thinner, it’s very easy to be broke off.
7. Resin products demould as soon as possible.
Due to resin products gives off a lot of heat when mixed with the curing agent, so it should be demoulded as soon as possible.
8. Do not use compound silicone oil.
Compound silicone oil is pure silicone oil, which is the compound of silicone oil and white oil, and the white oil is petrochemicals, if it is added, it’s easy to run the oil.
9. No silicone oil is recommended.
Silicone oil will destroy the molecular weight of silicone rubber. Too more silicone oil is added, the mold will be softer, then the tear and tensile strength will be reduced, and the mold will be non-durable. If necessary, the addition of silicone oil should be 5%~10%.
10. The edge of the mold is grooved
If brushing, it is necessary to groove the edge of the mold, which can prevent the mold dislocation.
11. Make the external mold.
The external mold can prevent the mold deformation to extend the life of silicone mold.
12. Good method to preserve the finished mold.
There are many methods to preserve the mold, such as, keep it clean, dry, stay away from corrosive substance, and so on.
13. Use the finished silicone mold after 24 hours storage.