FAQ of moulding silicone rubber

Frequently asked questions of moulding silicone rubber: 　　1.Why should the silicone mold be reused only for a few times? 　　It can be due to the following reasons: 　　a.Adding too much silicone oil in to silicon rubber. Silicon oil is an additive which destroies the molecular weight of silicone rubber and reduce the tension and tear strength. 　　b.Using the silicon rubber with a high hardness to make molds for small sized products with delicate and intricate designs and the silicon rubber with a low hardness to makes molds for large sized products with simple designs. 　　2.Why does the silicone mold get burnt out? 　　This consequence happens only because you have left out the important notes when using unsaturated resin materials to produce your products. The unsaturated resin produces great heat when added the curing agent. So you must demould the product within 3 minutes to avoid this problem. 　　3. Why does the silicone mould appear to be dry outside but wet inside? 　　Because molding silicone rubber is a kind of condensation silicone rubber, which get solidified after absorbing moisture from the air. In order to provide a significant shelf-life for the silicon rubber, we will dry out the water in the silicon rubber. 　　Solution: Add 0.05% water into the silicon rubber and Stir over a low speed briefly when you use it. 　　4. Why is the tear strength of the silicone mold weak? 　　In order to reduce the viscosity of silicone rubber and pursue a good quality, you may add a lot of silicone oil into the silicon rubber when making molds. In fact, it might have just the opposite effect. The tension and the tear strength will be reduced badly with the addition of silicon oil. And the silicon molds will be in a weak and flimsy manner. 　　5. Why is the silicon mold oily? 　　The molding silicone rubber itself doesn’t contain any oil, so it won’t be oily. If the mold is oily, it may be because you add the compound silicone oil( the compound of silicon oil and white oil). The white oil is not silicon oil but a kind of petrochemicals. 　　Shenzhen Hongye Jie Silicone Factory professional development, increase production of liquid silicone molding, liquid silicone molding plus, plus liquid silicone rubber molding silicone products welcome customers and dealers to negotiate,expert advice hotline:86-0755-89311348, you can also e-mail us info@szrl.net.