The Mold Production Failed. 90% Of The Reason Was That The Wrong Type Of Silicone Was Chosen.

The failure of the industrial-grade mold silicone rubber re-molding is often related to the hardness, viscosity, tear resistance, tensile strength and elongation of the silicone rubber used, as shown in the figure:

It can be seen that factors such as hardness, viscosity, tear strength, tensile strength and elongation rate will affect the success or failure of the silicone rubber mold.
If this silicone rubber is too soft or too hard, both of these situations will cause certain damage during the demolding process. Excessive hardness: poor toughness. When the mold is inverted or there are complex patterns during the demolding process, forcibly removing the components may cause tearing. Insufficient hardness: insufficient strength. When a large or heavy object is used to flip the mold, the mold is prone to deformation, resulting in inaccurate dimensions.
If the tear strength and tensile strength are insufficient, the mold may be damaged. If the model has sharp corners and the tear strength and tensile strength of the silicone rubber are low, then during demolding, there is a high possibility that the sharp corners will come off.
Excessive viscosity can lead to the formation of bubbles and the loss of details. For high-viscosity silicone rubber, if vacuum treatment is not carried out, bubbles are difficult to remove, resulting in holes on the mold surface after curing. This may cause raised areas when replicating the product. Moreover, the poor fluidity makes it difficult to fill complex patterns.
Inconsistent stretching rates may result in poor rebound effect. For models with deep grooves or large chamfers, a high stretching rate silicone rubber should be used. If a lower stretching rate is chosen, the model may not be able to return to its original shape after forced demolding, leading to subsequent mold size deviations. If you are unsure about the hardness of the product, please contact us.

As shown in the table above, during the production process of the silicone mold, the problem of failed demolding occurred. In fact, this is closely related to the hardness of the selected silicone material. If a silicone material with excessively high hardness is used to manufacture the product, it will result in difficulties in demolding, reduced tensile strength, poor fluidity, and the mold will be unusable after production, and even may not be usable at all!

Another problem we often encounter is that the silicone molds become fragile. Firstly, the shrinkable mold silicone is made by mixing two components - A and B. The main reason why the silicone we use is fragile is that the proportion of the curing agent in component B is incorrect. The recommended proportion is 2-3%. Some customers, in an attempt to speed up the curing process, increase the proportion of the curing agent in component B to 5%. However, after the silicone cures, it becomes prone to cracking.

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