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AT-3G™ High-Strength Hybrid Acrylic Adhesive

AT-3G is a hybrid, acrylic-based adhesive for anchoring threaded rod and rebar into cracked and uncracked concrete. Ideal for cold weather and wet concrete applications, AT-3G dispenses easily and offers a fast curing time for same-day bolt up. It can be specified for a wide range of in-service temperatures, and maintains its strong bond strength in extreme environments for ultimate design and jobsite flexibility. Tested and code compliant with the IBC and IRC, AT-3G hybrid adhesive is easy to install with the conventional blow-brush-blow hole cleaning method.

Key Features

  • Excellent for use in cold weather conditions or applications where fast cure is required
  • Recognized per ICC-ES AC308 for threaded rod and rebar anchoring, along with post-installed rebar development and splice length design provisions
  • Conventional blow-brush-blow hole cleaning technique using a wire brush — no power brushing required
  • Base material installation temperatures down to 0°F (-18°C)
  • Use in grout-filled CMU construction
  • Use of a vacuum in lieu of compressed air for hole cleaning
  • Installation into oversized holes
  • Installation in holes drilled with diamond core bits
Mix Ratio/Type 10:1 hybrid-acrylic
Mixed Color Gray
Base Materials Concrete — cracked and uncracked
Base Material Conditions Dry, water-saturated, water-filled holes
Anchor Type Threaded rod or rebar
Substrate Installation Temperature 23°F (-5°C) to 104°F (40°C)
In-Service Temperature Range -40°F (-40°C) to 320°F (160°C)
Storage Temperature 41°F (5°C) and 77°F (25°C)
Shelf Life 18 months
Volatile Organic Compound (VOC) 41 g/L
Model No. Option Packaging Qty. Carton Qty. Compatible Tools
AT3G10 9.5 oz. coaxial cartridge
Includes AMN19Q mixing nozzle
1 6 CDT10S dispensing tool / AMN19Q mixing nozzle


  • Threaded rod anchor and rebar dowel installations in cracked and uncracked concrete under a wide variety of environmental installation and use conditions
  • Installation in downward, horizontal and upwardly inclined (including overhead) orientations
  • Installation down to 0 F (-18 C)
  • Qualified for use in structures assigned to Seismic Design Categories A through F


  • Surfaces to receive adhesive must be clean per approved hole cleaning method.
  • Base-material temperatures must be 23°F (-5°C) or above at the time of installation.
  • To warm cold adhesive, store cartridges in a warm, uniformly heated area or storage container. Do not immerse cartridges in water or use microwave to facilitate warming.
  • Mixed material in nozzle can harden in 2-3 minutes at temperatures of 70°F (21°C) and above.
  • Use only Simpson Strong-Tie mixing nozzles in accordance with Simpson Strong-Tie instructions. Modification or improper use of mixing nozzle may impair AT-3G adhesive performance.
  • For full instructions, see Adhesive Anchoring Installation Instructions.

Clean Up

  • Uncured material — Wipe up with cotton cloths.
  • Cured material — Chip or grind off surface.

Test Criteria

  • AT-3G has been tested in accordance with ICC-ES 308, ACI 355.4 and applicable ASTM test methods.

Cure Schedule

Base Material
Temperature °F
Base Material
Temperature °C
Gel Time (mins.) Cure Time (hrs.)
23 -5 50 5
32 0 25 3 1/2
41 5 15 2
50 10 10 1
59 15 6 40 min.
68 20 3 30 min.
86 30 2 30 min.
104 40 2 30
  1. For SI: 1°F = (°C x 9/5) + 32.
  2. For water-saturated concrete, the cure times should be doubled.
  3. For installation of anchors in concrete where the temperature is between 0°F and 23°F (-18°C and -5°C), the adhesive must be conditioned to a minimum temperature of 65°F (18°C).

AT-3G Typical Properties

Property Class A (35°–40°F) Class B (40°–60°F) Class C (>60°F) Test Method
Consistency Non-sag Non-sag Non-sag ASTM C881
Bond Strength, Slant Shear Hardened-to-Hardened Concrete, 2-Day Cure1 2,800 psi 2,800 psi 2,800 psi ASTM C882
Hardened-to-Hardened Concrete, 14-Day Cure1 3,200 psi 3,100 psi 3,250 psi
Compressive Yield Strength, 7-Day Cure2 10,300 psi 13,400 psi 15,000 psi ASTM D695
Compressive Modulus, 7-Day Cure2 1,400,000 psi 1,550,000 psi 1,650,000 psi ASTM D695
Heat Deflection Temperature, 7-Day Cure3 258°F (126°C) ASTM D648
Glass Transition Temperature, 7-Day Cure3 237°F (114°C) ASTM E1640
Decomposition Temperature, 24-Hour Cure3 480°F (250°C) ASTM E2550
Water Absorption, 24-Hours, 7-Day Cure3 0.90% ASTM D570
Shore D Hardness, 24-Hour Cure3 81 ASTM D2240
Linear Coefficient of Shrinkage, 7-Day Cure3 0.000 in./in. ASTM D2566
Coefficient of Thermal Expansion3 2.6 x 10-5 in./in.°F ASTM C531
  1. Material and curing conditions: Class A at 35° ± 2°F, Class B at 40° ± 2°F, Class C at 60° ± 2°F.
  2. Material and curing conditions: Class A at 0° ± 2°F, Class B at 40° ± 2°F, Class C at 60° ± 2°F.
  3. Material and curing conditions: 73° ± 2°F.

Related Literature

Code Reports & Compliance