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Sikaflex®-15 LM

Part of the Sikaflex series

Sikaflex®-15 LM


Sikaflex-15 LM is a low-modulus, high-performance, 1-component, polyurethane-based, non-sag elastomeric sealant. Meets Federal Specification TT-S-00230C, Type II, Class A; ASTM C-920, Type S, Grade NS, Class 100/50, use T, NT, G, M; Federal Specification for silicones - TT-S-001543 A, Type non-sag. Tested in accordance with ASTM C-1382 for use in EIFS systems.


  • Excellent for moving joints in vertical applications.

  • Suitable for use between similar as well as dissimilar materials.

  • Typical applications include joints in concrete panel and wall systems, around window and door frames, reglets, flashing, common roofing detail applications, etc.

  • Exceptional sealant choice for high-rise and facade applications where high movement capability is required.

  • An effective sealant for use in Exterior Insulation Finish Systems (EIFS).


  • Low modulus of elasticity.

  • Easy and ready to use.

  • Eliminates time, effort, waste, and equipment clean-up.

  • Cures to a durable, flexible consistency.

  • Exceptional cut and tear resistance.

  • Stress relaxation properties.

  • Excellent adhesion.

  • Bonds to most construction materials without a primer.

  • Paintable with water-, oil- and rubber based paints.

  • Excellent resistance to aging, weathering.

  • Jet fuel resistant.

  • Proven in tough climates around the world.

  • Non-leaching.

  • Capable of +100% / -50% joint movement.

  • Two-hour UL fire rating when used with Ultra BlockĀ®.

Related Products

Product Description
Closed Cell Backer Rod and Soft Cell Backer Rod Sonolastic® Closed-Cell Backer-Rod is a closed-cell, polyethylene foam joint-filler and backing for elastomeric sealants.
Sonolastic 150 VLM (MasterSeal NP 150) SONOLASTIC® 150 with VLM Technology Very low-modulus, nonsag, elastomeric, silyl-terminated polyether (hybrid) sealant.

Products in this Series

Product Description
Sikaflex 11FC Sikaflex 11FC is a One part advanced polyurethane, elastomeric sealant/adhesive.
Sikaflex 2C EZ Booster Sikaflex 2C EZ Booster is a product manufactured by Sika.
Sikaflex Color Packs Sikaflex Color Packs is a product manufactured by Sika.
Sikaflex Primers Sikaflex Primers is a product manufactured by Sika.
Sikaflex® Textured Sealant Sikaflex® Textured Sealant is a One-component, all purpose, polyurethane sealant.
Sikaflex®-15 LM Sikaflex®-15 LM is a High-performance, low-modulus elastomeric sealant.
Sikaflex®-1a Sikaflex®-1a One part polyurethane, elastomeric sealant/adhesive.
Sikaflex®-1c SL Sikaflex®-1c SL is a High performance, self-leveling, 1-part polyurethane sealant.
Sikaflex®-2c NS Sikaflex®-2c NS is a Two-component, non-sag, polyurethane elastomeric sealant.
Sikaflex®-2c SL Sikaflex®-2c SL is a Two-component, self-leveling, polyurethane elastomeric sealant.
Sikaflex-2c NS EZ Sikaflex-2c NS EZ is a Two-component, non-sag, polyurethane elastomeric sealant.