Sikaflex-1c SL

High Performance, self-leveling, 1-part polyurethane sealant

Sikaflex-1c SL is a single component, self-leveling, premium-grade polyurethane sealant with an accelerated curing capacity. Meets Federal Specification TT-S-00230C, Type 1, Class A. Meets ASTM C-920, Type S, Grade P, Class 25, use T, M, A, G, I.

Where to use

Sikaflex-1c SL is used to seal horizontal expansion joints in concrete and cementitious slabs such as:

  • Sidewalks
  • Balconies
  • Pavements
  • Terraces
  • Warehouses
  • Factories
  • Civil Structures
  • Plazas
  • Pitch Pans


  • 1-component, no mixing
  • Self-leveling, pourable
  • Accelerated curing
  • Permanently elastic
  • High durability
  • Resists aging, weathering
  • Excellent adhesion
  • Convenient, easy-to-use packaging
  • Jet fuel resistant



Recommended application temperatures: 40°-100°F. Preconditioned sealant to approximately 70°F is necessary when working at extremes. For best performance, Sikaflex-1CSL should be poured into joint when joint slot is at mid-point of its designed expansion and contraction. Pour sealant into joint slot in one direction and allow sealant to flow and level out as necessary. Tool as required, although minimum tooling is necessary. Joint dimension should allow for 1/4 inch minimum and 1/2 inch maximum thickness for sealant. Proper design is 2:1 width to depth ratio. Always use bond breaker tape or closed cell backer rod for support on horizontal joints.


10.1 fl. oz. cartridge seals 12 linear ft. of 1/2 x 1/4 in. joint. 29 fl. oz. cartridge seals 36 linear ft. of 1/2 x 1/4 in. joint. 4.5 gal pail seals 684 linear ft. of 1/2 x 1/4 in. joints. 50 gal drum seals 7,555 linear ft. of 1/2 x 1/4 in. joint.