Silicones


SI-elementNeutral curing, non-acetoxy silicone sealants are widely available and have become the standard for architectural use. “Neutral” refers to the Ph of the reaction product during the curing process.  A reaction product with a neutral Ph will not adversely affect construction materials.

BASIC USE:

  • Structural bonding and structural sealant glazing (SSG) of glass to structural frames
  • Protective glazing systems and insulating glass units to improve thermal performance (reduce heat loss)
  • Missile impact and bomb blast applications


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BENEFITS:

  • Excellent joint movement capabilities; can exceed ± 50% (ASTM C 920, Class 50 and Class 100/50)
  • Excellent low temperature movement capability
  • Excellent UV and heat stability
  • Good adhesion for many substrates especially glass; a primer is recommended on certain substrates, particularly porous substrates
  • High, medium and low modulus sealants available
  • Available in field tintable versions with a wide range of standard colors

 

LIMITATIONS:  

  • Not paintable
  • Acetoxy chemistry based silicone sealants have strong odor and are not compatible with materials reactive to acetic acid
  • May cause staining of some types of natural stone and “residue” run down on non-porous panel facades (low and non-staining silicone formulations are available)

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