SIKA Sikaflex-15 LM Low-Modulus Polyurethane Sealant 10 oz Cartridge White - image 1

SIKA Sikaflex-15 LM Low-Modulus Polyurethane Sealant 10 oz Cartridge White

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SIKA Sikaflex-15 LM Low-Modulus Polyurethane Sealant 10 oz Cartridge White


Sika Sikaflex-15 LM is a low-modulus, one-component, polyurethane-based non-sag elastomeric sealant supplied in a white 10.1 oz cartridge. It is easy to use with no mixing or equipment cleanup, and excels at moving joints in vertical applications. Each box contains 24 cartridges.


Key Features:

  • Low Modulus: Low-modulus formulation with high movement capability for moving joints.
  • One-Component: Ready-to-use single-component polyurethane, no mixing required.
  • Non-Sag: Non-sag elastomeric consistency suited to vertical applications.
  • Dissimilar Materials: Suitable for use between similar as well as dissimilar materials.
  • Fire Rated Joints: Used in 2- and 3-hour UL fire rated joint systems including FF-S-0007, FW-S-0015 and HW-S-0076.
  • Code Compliant: Meets ASTM C-920, Type S, Grade NS, Class 100/50 and Federal Specification TT-S-00230C, Type II, Class A.

Specifications Table:

Specification Details
Brand Sika
Manufacturer model 442144
Sell unit 1 cartridge, 10.1 oz
Product line Sikaflex-15 LM
Material One-component polyurethane
Color White
Size 10.1 oz cartridge
Type / grade Low-modulus, non-sag elastomeric sealant
Applicable standards ASTM C-920 Type S, Grade NS, Class 100/50, use T, NT, G, A, O, M; TT-S-00230C Type II, Class A; TT-S-001543A Type non-sag; tested per ASTM C-1382 for EIFS
Pieces per box 24
Pieces per carton 24
Warranty Limited Product Warranty
Item weight 1.04 lb
Intended use Moving joints in concrete panels and wall systems, window and door frames, reglets, flashing and roofing details; high-rise and facade applications

Fit and Compatibility:

Suitable for use between similar and dissimilar materials including concrete panels, window and door frames, reglets, flashing and common roofing details, and is tested per ASTM C-1382 for use in EIFS systems. Proper joint design and backer rod, where required by joint geometry, are standard practice.


Frequently Asked Questions (FAQ):

Q: What is included?
A: One 10.1 oz white cartridge of Sikaflex-15 LM; full boxes contain 24 cartridges.


Q: Where is this sealant used?
A: For moving joints in concrete panel and wall systems, around window and door frames, reglets, flashing and common roofing detail applications.


Q: Is it easy to apply?
A: Yes, it is a one-component, ready-to-use sealant that eliminates time, effort, waste and equipment clean-up.


Q: What does low modulus mean?
A: It means the cured sealant stretches readily, making it excellent for moving joints and high-movement facade applications.


Q: Can it be used in fire-rated joints?
A: Yes, it is used in 2- and 3-hour UL fire rated joint systems such as FF-S-0007, FF-S-0037 and FW-S-0015.


Q: Does it work on dissimilar materials?
A: Yes, it is suitable for use between similar as well as dissimilar materials.


Expert Verdict — Reviewed by the SuperArbor Pro Desk

Sikaflex-15 LM is a go-to choice for expansion and moving joints where a high-movement, low-modulus sealant is specified, especially on vertical facade and high-rise work. Tool the joint for full substrate contact and follow the printed joint-width-to-depth ratio for proper movement capability. For horizontal traffic-bearing joints, select a dedicated traffic-grade polyurethane instead.

Polyurethane sealants contain isocyanates; wear gloves and eye protection, ventilate the work area, and follow the Safety Data Sheet.


Order Sikaflex-15 LM white polyurethane sealant today for professional-grade moving-joint sealing.

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All orders are reviewed before fulfillment. You are not charged until your order is approved and ready to ship — and you may cancel at any time before that at no cost.

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