Glazing and Backbedding


CSL343 Window and Door Manufacturing

CSL343 Window and Door Manufacturing

AAMA Certified for window and door manufacturing. Also used in building and construction as an all weathering resistant silicone sealant.


Window Door CCSL343 is a one-part, neutral moisture cure, room temperature vulcanizing (RTV) 100% silicone sealant that readily extrudes and cures to produce a low modulus silicone rubber.

CSL343 has excellent resistance to all weathering conditions and normal airborne chemicals. 

CSL343 retains its original design properties over many years of exposure.

CSL343 will not slump or flow when applied vertically.

CSL343 withstands ±50% joint movement.

CSL343 has a broad temperature range of -60°C to 200°C (-76°F to 392°F).


  • Room temperature curing
  • Non-sag rheology
  • Meets ASTM  C920-11 Type S, Grade NS, Use NT, M, G, A, O and I specifications; Federal Specifications TT-S-001543A and TT-S-00230C; Can/CGSB -19,13-M87
  • AAMA 802.3-10 Type I, AAMA 805.2-10 group C, 803.3-10 Type I
  • Withstands extreme joint movement


  • Easy to use and repair
  • Low stress after curing
  • Non-corrosive
  • Resists humidity, moisture, and weathering
  • Remains flexible in extreme conditions

CSL343 is particularly effective for building joints designed for extreme movement.  Typical applications include expansion joints, concrete construction for curtain wall and precast concrete panel joints, and repair of joints where another sealant has failed because of excessive movement.

Complementary products including different extrusion rates and fast cure formulations are also available.






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UL 2761 - 2011 Standard for the Sustainability for Sealants and Caulking Compounds