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GS300
Glazing Silicone

GS300 is a gun grade, acetoxy cure, glazing silicone which forms a flexible and durable weather tight seal. It can be used for all classical glass and glazing applications.

Usage/Purpose

GS300 can be used for: all classical glazing joints including cap beads; shop windows, display cases, etc.; conservatories and greenhouses; and glass panels.

  • Meets the requirements of ISO 11600 G - 25 LM
  • Excellent adhesion to most glazing and frame materials
  • Wide service temperature range: -40°C to +180°C
  • Accommodates joint movement up to 25%
  • Suitable for sanitary applications
  • Solvent free

Usage Guidelines

  • Always carry out a test application prior to installation, to confirm compatibility and suitability for use
  •  Application should be in accordance with BS 8000:16 - “Code of practice for sealing joints in buildings using sealants”
  • Apply between +5°C and +40°C using a conventional skeleton gun or electric/power equipment
  • All beads should be tooled after application to ensure firm, full contact with the joint faces
  • Tooling should commence without delay due to the rapid skinning of the product

Technical data

PropertyTest MethodClassification
Composition acetoxy cure silicone sealant 
Specific Gravity 1.02
ConsistencyISO 7390, profile U20 non-sag
Shore A HardnessISO 86820
Skin Forming Timeat 23°C, 50% RH20 minutes
Tack Free Time  Approximately 30 minutes
Cure Rateat 23°C, 50% RH2-3 mm/1st day
Tensile StrengthISO 83390.6 N/mm²
Modulus at 100% ElongationISO 8339 0.35 N/mm²
Elongation at BreakISO 8339250% 
Movement Accommodation 25%
Elastic RecoveryISO 738995% 
Application Temperature +5°C to +40°C
Service Temperature Range  -40°C to +180°C 
Storage  Store in dry conditions between +5°C and +25°C
Shelf Life 18 months when stored as recommended in original unopened containers
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