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The Familiar Problems On Silicone Mold Vacuum Casting For Prototype Making
Feb 23, 2017

Prototype silicone series of silicone is a mobile liquid, no matter what color, in fact, the quality is the same, A component is the flow of liquid, B component is curing agent. First mold or copy the product to deal with, take a certain amount of colloid, add 2-3% of the curing agent, can be used after mixing even, 2-3 hours mold can be cured molding. With no deformation, no shrinkage, high temperature, mold can be used repeatedly after molding, to provide products for rapid replication, product shrinkage can reach two thousandths, mainly for prototyping model and small batch replication products

First, the number of times the number of molds

In the process of making the mold to add too much silicone oil, silicone oil destroyed the molecular weight of the silicone, so the mold will appear less mold times and other phenomena. If you want to do small pieces of product patterns more complex products, with a large hardness of silicone to open mode, there will be less time to turn the phenomenon of mold, because the silicone over time will be very brittle, easy to break. On the contrary, if you do large pieces of products with a small hardness of silicone to do the mold, the results will also be unsatisfactory. Because the silica is too soft, its tension and tear strength will be reduced, made out of the mold will be deformed, so the number of times the mold will be reduced. Mold glue itself is very good quality, silicone is not good or bad, only suitable and not suitable. We have to use the size of the product for the hardness of silica gel to make the mold will not appear this situation.

Second, the phenomenon of burning mold

Because the unsaturated resin and resin products added peroxide curing agent, the resin reaction will produce a lot of heat, the general resin curing time of 3 minutes, so 3 minutes after the release as soon as possible to prevent the silicone mold will not Produce the phenomenon of burning mold.

Third, there is no matter how dry things dry

Mold silica gel is a condensed silica gel, it is absorbed by the moisture in the air and curing, the process of making silica gel, the water evaporated, and not transferred into the amount of water, this phenomenon will occur The Solution: This phenomenon does not belong to product quality problems, but because there is no control of water, to enhance the storage period of silicone, shelf life will appear for some long time, as long as the use of silica gel, the appropriate amount of 0.05% water, stir evenly Can solve some of the situation. 

Fourth, the phenomenon of tension difference

Because customers in the process of making the mold, in order to reduce the viscosity of silica gel, so that easy to operate silicone and silica gel in a large number of added silicone oil, which will make the silicone becomes very soft, resulting in intolerance, tear strength, Tension deterioration of the phenomenon, resulting in mold is not durable, short life, turn the number of times less phenomenon.

Mold silicone itself is not to take the oil, there is oil because of the process of adding a combination of silicone oil (silicone oil and white mineral oil complex), because the white mineral oil is petrochemical products, not silicone oil.

Fifth, the mold is not acid and alkali, intolerant aging

In the process of making silicone mold, we recommend that customers do not add any silicone oil, if necessary, silicone oil up to no more than 5% to 10%. Because the addition of silicone oil will damage the molecular weight of silica gel too much, so do the mold will produce acid and alkali, intolerant aging phenomenon. 

Sixth, mold surface traces, stripes, not smooth and so on 

This phenomenon is due to the fact that the product or model to be copied is not polished or polished. Because in fact the model or product itself is not smooth enough or perfect, so to copy the product or model if not polished or polished, no matter how good the silicone mold will be beautiful, not smooth enough. There is also a situation that is playing the release agent in the time, no brushing evenly will cause the mold is not smooth.

If you want to know more about cnc parts with anodize and cnc prototype aluminum casting. please email below.steven@smilecnc-china.com (our sales manager)