Neutral 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
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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