10.1 fl. oz. moisture-proof composite cartridges
24/case. 29 oz. moisture-proof composite cartridges
12/case. 4.5 gallon pails
50 gallon drums

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


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. 

How to Use

Surface Preperation

Clean all surfaces. Joint walls must be sound, clean, dry, frost-free, and free of oil and grease. Curing compound residues and any other foreign matter must be thoroughly removed. A mechanically roughened surface will also enhance bond. Install bond breaker tape or backer rod to prevent bond at base of joint.


Priming is not usually necessary. Substrates only require priming if testing indicates a need or where sealant will be subjected to water immersion after cure. Consult Sikaflex Primer Technical Data Sheet or Technical Service for ad- ditional information on priming. 


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 contrac- tion. 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.


  • Allow 1 week cure at standard conditions when using Sikaflex-1CSL in total water immersion situations
  • Maximum exposure level of chlorine is 5 ppm.
  • In joints subject to movement - maximum depth of sealant must not exceed 1/2 in.; minimum depth is 1/4in.
  • Minimum depth of sealant for horizontal joints subject to traffic is 1/2 in.
  • Maximum expansion and contraction should not exceed 25% of average joint width.
  • Do not cure in the presence of curing silicone sealants.
  • Avoid contact with alcohol and other solvent cleaners during cure.
  • Do not apply when moisture-vapor transmission condition exists from the substrate as this can cause bubbling within the sealant.
  • Use opened cartridges the same day.
  • The ultimate performance of Sikaflex-1C SL depends on good joint design and proper application with joint surfaces properly prepared.
  • Do not use in contact with bituminous/asphaltic materials.