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How does liquid silicone mold shrink

19 Nov 2019

Production of liquid silicone products, often are contained in the mold and the product after stripping cooling certain shrinkage, then how to shrink the liquid silicone mold?

Liquid silicone glue, found in the production process of thousands of liquid silicone products, although LSR liquid silicone does not shrink in the mold, they will normally shrink by 2.5% to 3% after stripping and cooling.

The liquid silicone formula and mold factors leading to the shrinkage of liquid silicone are analyzed as follows:

Liquid silicone rubber shrinkage, to a certain extent, is dependent on the liquid silicone rubber formula.

Therefore, it is recommended to read the product manual carefully when purchasing liquid silicone rubber materials, or consult with the conventional production sales manager or technical engineer.

Liquid silicone glue

From the perspective of mold, the shrinkage rate may be affected by seven factors:

(1) including mold temperature;

(2) rubber material demoulding temperature;

(3) cavity pressure;

(4) the following compression of rubber material;

(5) the location of the injection point is also useful to considering, because the shrinkage of the flow direction of the glue is usually greater than the vertical flow direction of the glue.

6 liquid silicone products of the appearance of the size of its shrinkage also have an impact on the thicker products of the shrinkage ratio is generally smaller than this.

7 secondary vulcanization effects may be an additional contraction of 0.5%-0.7%.

Liquid silicone mold shrinkage rate how much good?

Concord provides high quality liquid silicone glue to match normal and reasonable silicone shrinkage.

KANGLIBANG is to creat solution for your problem with bonding silicone, welcome customer inquiry to us.

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+0086-135 0281 9396 Edsion YIN (Sales)

+0086-18098994276 Gary Lee (Sales)

+0086-138 2374 7978 Coco Wei (Sales)




H Building ,Xinwei The 3rd Industrial Park,Dalang Street,Longhua New District , Shenzhen City ,Guangdong Province ,China


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