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Conspec Family Business BadgeConspec Warranty BadgeTwo part, 2:1 ratio, 100% solids, low viscosity, high modulus, structural epoxy adhesive.


$36.95 $29.75

Crackbond LR-321 Epoxy Injection Resin 6.1-oz

Crackbond LR321 Injection Resin is a two component, 2:1 ratio, 100% solids,high modulus, structural epoxy adhesive. It is a solvent free, low odor, high strength, moisture insensitive, low viscosity epoxy system. Crackbond LR321 is formulated for use as an injection resin for cracks in structural concrete, masonry & wood. It’s also perfect for epoxy grouting, healing-sealing or as a mortar when mixed with sand. It has the viscosity of light oil and low surface tension, allowing it to deeply penetrate fine cracks. It cures to a solid with no shrinkage, bonds to both surfaces of the crack, bonding the structure back to its original monolithic strength. Crackbond LR321 can be used at temperatures between 40°F – 110°F, providing contractors with a choice for injecting cracks in high and low temperature environments. In addition, Crackbond LR321 has a viscosity of 450 cps which is ideal for gravity feed crack injection applications. Crackbond LR321 is an excellent choice where a high strength adhesive with maximum field reliability is desired.

CRACKBOND LR-321 has been approved under Florida Department of Transportation (FDOT) SpecificationSection 926 Epoxy Crack Injection Type E. It is listed on their Approved Products List (APL)

Meets Florida DOT Approved Products List Florida DOT Approved Products List APL QPL MaterialsFL-DOT APL Listing for Crackbond LR-321 Injection Resin 

This includes our 16 oz. cartridges, bulk systems in addition to the smaller 6.1 single cartridge found in our Crackbond Crack Repair Kits


General Uses

• Pressure injection of fine to medium size cracks (3mm to ¼”)
• Primer for industrial coatings
• Bonding agent for new to old concrete repair
• Epoxy Resin binder for epoxy mortar patching using addition of aggregate
• Sealer for interior slabs and exterior above-ground slabs from water, chlorides and mild chemical attack
• Gravity feed structural crack repair in horizontal concrete, masonry and wood in fine to medium size cracks

Advantages and Features

• FL DOT / APL Certification Number: 926-004-016

High Strength, Moisture insensitive system-can be used on damp surfaces
• Low Viscosity epoxy system ideal for gravity feed crack injection applications
• 100% solids, solvent free system means low VOC content



To view the most recent Technical Data Sheet, please click here.

Weight 30 oz
Dimensions 3 x 3 x 15 in