How to spreading butyl sealant well onto alu.spacer

 There are two sealant in insulating glass production. 

  1. The primary sealant-Butyl/PIB sealant.
  2. The secondary sealant-silicone,polysulfide.

So now we are talking about the primary sealant--butyl.  

  • Where should you spread the butyl onto the aluminum spacer?       In the middle of the spacer bar side. 

 

  • What is the best volume for butyl spreading?    usually 0.3g/m. 

 

  • The butyl sealant width before press: ≥3mm.

 

  • The butyl sealant width and thickness after pressing.   Width: 4-4.5mm.  Thickness:0.3-0.5mm. 

See the below picture for instruction. 

Butyl-width-thickness-volume.gif

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