Silicone and other Sealants

Pro-Spec® Flexi-Seal Window & Glass Silicone


PRO-SPEC FLEXI-SEAL WINDOW & GLASS SILICONE is a one component, gun applied, silicone rubber sealant for weatherproofing or sealing joints and gaps around windows and general sealing. It is an acid (acetoxy) cure, medium modulus silicone sealant.


PRO-SPEC FLEXI-SEAL WINDOW & GLASS SILICONE SEALANT has excellent adhesion and sealing properties to glass, ceramics, aluminium, laminates, enamel, porcelain, wood and some plastics.

Product Range

Product Code: 9300697117083

  • Size & Pack Type: 300g cartridge
  • Color: Clear

Technical Features

  • Ready to use
  • Excellent adhesion to glass
  • Excellent UV resistance
  • Excellent flexibility (joint movement capability ±15%)
  • High service temperature range –50oC to +150oC
  • Excellent adhesion to glass, ceramics, laminates, enamel, porcelain, wood and certain plastics (Pre-test plastics and critical surfaces prior to use)
  • Resistant to intermittent exposure to diluted acids and alkali solutions

Application Tips

  • Not recommended for use on bare metals other than stainless steel or aluminium
  • Most paints will not adhere to this sealant
  • Not suitable for aquariums or potable water containers
  • Not recommended for adhesion to cementious or marble surfaces
  • Not suitable for permanent immersion or in areas of high abrasion, e.g. walkways
  • Not resistant to organic solvents

Technical Details and Performance

Indicative information only, not to be used for setting specifications.

Consistency (as applied)

Non-slump, soft paste, easily extruded with cartridge gun

Curing Mechanism

Rapidly develops rubber consistency by reaction with moisture from the air

Curing Rate

1mm depth per day

Skin Forming Time

5-10 minutes (depending on weather conditions)

Hardness (when cured)

Approximately 25-30 (Shore A, instantaneous)


Approximately 400% (ASTM D412)

Service Temperature

–40oC to +150oC

Joint Movement Capability

±15% of original joint width. When applied in properly designed joint*

Properly designed joint refers to the accepted concept of correct sealant dimensions, i.e.. sealant depth equal to half sealant width and sealant applied over a suitable backing material which the sealant will not adhere to or which does not limit the free movement of the sealant.

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