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Sika Sikadur 21 Lo-Mod LV 4 Gallon

Sikadur 21 Lo-Mod LV, is a 2-component, 100 % solids, moisture-tolerant, epoxy resin binder. Used as a binder for epoxy mortar for patching and overlays.

  • Tolerant to moisture both before and after cure
  • Convenient easy mix ratio A:B = 1:1 by volume
  • Excellent strength development
$426.62
SKU
18857

Sika Sikadur 21 Lo-Mod LV – Low-Modulus, Low-Viscosity Epoxy Resin Binder

Sika Sikadur 21 Lo-Mod LV is a two-component, 100% solids, moisture-tolerant, low-viscosity epoxy resin binder designed for bonding, patching, and overlays. Engineered for high-strength applications, this low-modulus epoxy provides excellent adhesion, strength development, and resistance to moisture both before and after curing. It conforms to ASTM C-881 Type II, Grade 1, Class B & C and AASHTO M-235 specifications, making it an optimal choice for bonding fresh concrete to hardened concrete, securing injection ports, and as a binder for epoxy mortars.

Key Features:

  • Low-viscosity epoxy for easy handling and application
  • Moisture-tolerant both before and after curing
  • High-strength development with excellent adhesion
  • 1:1 mix ratio for convenient application
  • Suitable as a primer or binder for epoxy mortars
  • Conforms to ASTM C-881 and AASHTO M-235 specifications
  • USDA-certifiable for incidental food contact
  • Low-modulus formulation reduces stress on bonded substrates

Applications:

  • Bonding fresh concrete to hardened concrete
  • Epoxy mortar binder for patching and overlays
  • Sealing cracks and securing injection ports
  • Structural adhesive for concrete, steel, and masonry
  • Priming porous surfaces prior to application of epoxy overlays
  • Industrial and commercial repair applications

Technical Specifications:

Property Value
Packaging 4-gallon unit
Color Clear, amber
Shelf Life 2 years in original, unopened containers
Viscosity Approximately 1,000 cps
Compressive Strength (ASTM C-579, 28 days) 9,200 psi (63.4 MPa)
Flexural Strength (ASTM D-790, 14 days) 2,300 psi (15.8 MPa)
Tensile Strength (ASTM D-638, 14 days) 5,800 psi (40.0 MPa)
Mixing Ratio 1:1 by volume (Component A + B)

 

Frequently Asked Questions:

How is Sikadur 21 Lo-Mod LV applied?
Mix equal parts of Component A and Component B, then apply using a brush, roller, or trowel. For epoxy mortar applications, blend with oven-dried sand.

Can this product be used in exterior applications?
Sikadur 21 Lo-Mod LV is not recommended for exterior slabs exposed to direct thermal changes.

More Information
Brand Sika
Size 4 Gallon
Manufacturer Sika
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