In the Summer, pu is hardening speedly, often too late to operate, you can put into refrigerator, can effectively delay the hardening speed, but the industrial materials and food mixed with ,need to pay attention to the problem of food safety .
The dosage of the curing agent must not be too much, otherwise the curing speed is too fast,Can not to eliminate the bubbles.By the same token,To make the silicne rubber mold should be use vacuum equipment,if there is no vacuum equipment ,Can not mix the A and B too thick .
Do not stirring too hard when you mix the A and B , try to not cause the bubbles, otherwise it is will be difficult to eliminate.
If you use two pieces of mold parting method, must remember that before the second mold injection should spray the agent , Because white clay reflection.I've used sprinkler irrigation mould agent, the effect is not good, recommend vaseline, not only cheap but also effect is good, Please noted that don't apply it to the original, the silicone can achieve molecular effect of rolling over, so if you apply it on the original vaseline, will also be faithful reflection of the double module.
Do not recommend using cutting mold, no vacuum equipment, port, porosity, especially the mould line, junior students it is difficult to control., of course, if you think separete mold is too much trouble, be sure to use cutting mold, remember in advance with gaudy colours on the original mould line position, at this point, you need good quality silicone, transparency is required.
