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Silicone Sealant Production Test In 2024 | JCT Machinery

October 24, 2024
  • Q
    Recently, a customer came to JCT's factory to learn how to produce silicone sealant. Customer wanted to produce white silicone sealant, but the finished product turned out to be black. Do you know what caused this?
white silicone sealant                
Expected effect
black silicone sealant                
Actual effect


Possible Reasons For Producing Black Silicone Sealant
  • 1. Impure Raw Materials

  • Raw materials used may contain impurities, causing the finished product to turn black.

  • 2. Additive Problems

  • If some additives do not meet the requirements, they may react or decompose with the main ingredients to product black substances.

  • 3. Overheating

  • During the production process, if the temperature is too high, some ingredients may thermally decompose or coke, resulting in black substances.

  • 4. Uneven Stirring

  • If the mixing process is uneven, some ingredients may aggregate to form black particles or precipitation.

  • 5. Storage Conditions

  • The product may be affected by light, temperature or air during storage, causing the material to deteriorate or oxidize.

  • 6. Equipment Contamination

  • If the production equipment has been used with materials of other colors before, cross contamination may occur.

silicone sealant production
According to the inspection of the engineer on the same day, the blackening of the silicone sealant produced in this experiment was caused by the impurity of white carbon black.


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