SpecPrep SB Structural Concrete Bonding Agent

SpecPrep SB is a three-component bonding adhesive that creates a structural bond between fresh and existing concrete, and doubles as an anti-corrosion coating for rebar

SpecPrep SB offers up to a 24-hour open time and resists penetration of water and chlorides, though it won't form a vapor barrier after cure. It's suitable for bonding fresh concrete or repair mortars to existing concrete, and for protecting steel reinforcement during restoration.

Key Features & Benefits

• Long, up to 24-hour open time
• Bonds fresh concrete to hardened concrete and steel to fresh concrete
• Anti-corrosion coating for steel reinforcement
• Resists water and chloride penetration
• Ready to use — do not thin with solvents

Application Instructions

• Ensure surfaces are clean and structurally sound, removing oil, grease, dirt, laitance, rust, and curing compounds
• Abrasive blast cleaning or mechanical removal is recommended to achieve CSP 5-7 per ICRI Guideline 310.2-1997
• Apply to a saturated-surface-damp (SSD) substrate using a stiff brush or hopper gun
• For bonding, apply at 65-75 sq ft per gallon to a minimum thickness of 20 mils
• Acts as an effective bonding agent for up to 24 hours at approximately 65°F

Technical Data Summary

• Compressive Strength (ASTM C109): 3,200 psi at 3 days, 6,200 psi at 7 days, 8,250 psi at 28 days
• Flexural Strength (ASTM C348): 1,285 psi at 28 days

Packaging

Available in 1-gallon units (also offered in 3.75-gallon units).

Supporting Documents

Safety Data Sheet (SDS)

Technical Data Sheet (TDS)