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AT Acrylic Adhesive


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AT is a high-strength, acrylic-based adhesive anchoring system, formulated for use as a high-strength anchor-grouting material in a wide range of temperature conditions. It is a two-part system, with the resin and initiator being simultaneously dispensed and mixed through the mixing nozzle.

Key Features

  • Code listed under the IBC/IRC for URM per ICC-ES ESR-1958
  • Cure times — 24 hours at 0°F (–18°C), 1 hour at 60°F (16°C)
  • Non-sag gel formulation ideal for horizontal, vertical and overhead applications
  • Easy hole-cleaning procedure — no power-brushing required
  • Suitable for use in damp or wet anchor sites
  • When properly mixed, adhesive will be a uniform gray color
  • Available in 12.5 oz. and 30 oz. cartridges for application versatility
  • Manufactured in the USA using global materials
Model No. Option Packaging Qty. Carton Qty. Compatible Tools
AT13 12.5 oz. side-by-side cartridge 1 10 ADT813S dispensing tool / AMN19Q mixing nozzle
AT30 30 oz. side-by-side cartridge 1 5 ADT30S, ADTA30CKT or ADTA30P dispensing tools / AMN19Q mixing nozzle


  • Threaded rod anchoring and rebar doweling into concrete, masonry and URM (red brick)
  • Multiple DOT listings

Product Includes

  • AMN19Q mixing nozzle and extension included

Storage Conditions

  • For best results store between 32°F–80°F. Partially used cartridges can be stored for a limited time by leaving nozzle in place. To re-use, attach new nozzle.

Shelf Life

  • 12 months from date of manufacture in unopened cartridge


  • Surfaces to receive adhesive must be clean.
  • Base material temperature must be 0°F (–18°C) or above at the time of installation.
  • For information on installations below 0°F (–18°C), contact Simpson Strong-Tie.
  • Mixed material in nozzle can harden in 5–7 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 adhesive performance.
  • For full instructions, see Adhesive Anchoring Installation Instructions.

Cure Schedule

Base Material
Temperature °F
Base Material
Temperature °C
Cure Time (hrs.)
0 -18 24
25 -4 8
40 4 4
60 16 1
70 21 30 min.
100 38 20 min.

In-Service Temperature Sensitivity

Base Material
Temperature °F
Base Material
Temperature °C
Percent Allowable
Load for TEMPinst = 0°F
Percent Allowable
Load for TEMPinst ≥ 70°F
1. Refer to in-service temperature sensitivity chart for allowable bond strength reduction for in-service temperature. See Anchoring and Fastening Systems for Concrete and Masonry catalog, “Supplemental Topics for Anchors.”
2. TEMPinst is the base material temperature during installation and curing of the adhesive.
3. Percent allowable load for TEMPinst = 0°F (-18°C) is to be used for TEMPinst between 0°F (-18°C) and 70°F (21°C).
4. Percent allowable load may be linearly interpolated for intermediate base material in-service temperatures.
5. °C = (°F-32) / 1.8
0 -18 100% 100%
32 0 100% 100%
70 21 100% 100%
110 43 82% 82%
135 57 74% 82%
150 66 38% 65%
180 82 22% 28%

Clean Up

Uncured material — Wipe up with cotton cloths. If desired scrub area with abrasive, water-based cleaner and flush with water. If approved, solvents such as ketones (MEK, acetone, etc.), lacquer thinner, or adhesive remover can be used. DO NOT USE SOLVENTS TO CLEAN ADHESIVE FROM SKIN. Take appropriate precautions when handling flammable solvents. Solvents may damage surfaces to which they are applied. Cured material — Chip or grind off surface.

Test Criteria

Anchors installed with AT adhesive have been tested in accordance with ICC-ES Acceptance Criteria for Anchors in Unreinforced Masonry Elements (AC60).

Property Test Method Result*
*Material and curing conditions: 73 ± 2˚F, unless otherwise noted.
Consistency ASTM C881 Non-sag/thixotropic paste
Heat deflection ASTM D648 142°F (61°C)
Bond strength (moist cure, 60°F) ASTM C882 2,960 psi (2 days)
3,567 psi (14 days)
Water absorption ASTM D570 0.25% (24 hours)
Compressive yield strength (cured 60°F) ASTM D695 10,930 psi (7 days)
Compressive modulus (cured 60°F) ASTM D695 502,330 psi (7 days)
Shore D hardness ASTM D2240 91
Gel time ASTM C881 5 minutes
VOC ASTM D2369 25 g/L
Shrinkage coefficient ASTM D2566 0.004 in./in.

Suggested Specifications

Anchoring adhesive shall be a two-component acrylic based system supplied in manufacturer's standard side-by-side or coaxial cartridge and dispensed through a static-mixing nozzle supplied by the manufacturer. Adhesive shall meet the physical requirements of ASTM C-881 for Type I and IV, Grade 3, Class A, B and C and must develop a minimum 10,210 psi compressive yield strength after 7 day cure. Adhesive must have a heat deflection temperature of a minimum 149°F (65°C). Adhesive shall be AT adhesive from Simpson Strong-Tie, Pleasanton, CA. Anchors shall be installed per Simpson Strong-Tie instructions for AT adhesive.

Related Literature

Code Reports & Compliance