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ET-HP® Epoxy Adhesive


ET-HP® is a two-component, high-solids, epoxy-based system for use as a high-strength, non-shrink anchor-grouting material. Resin and hardener are dispensed and mixed simultaneously through the static mixing nozzle. ET-HP is formulated for anchoring threaded rod and rebar into concrete (cracked/uncracked) and masonry.

Key Features

  • Passed the demanding ICC-ES AC308 adverse-condition tests pertaining to elevated temperatures and long-term sustained loads
  • Code listed under the IBC/IRC for cracked and uncracked concrete per ICC-ES ESR-3372
  • Code listed under the IBC/IRC for masonry per IAPMO UES ER-241
  • Suitable for use under static and seismic loading conditions in cracked and uncracked concrete and masonry
  • Cure times: 24 hours at 70°F, 72 hours at 50°F
  • Easy hole-cleaning – no power-brushing required
  • Suitable for use in dry or water-saturated concrete
  • When properly mixed, adhesive will be a uniform gray color
  • Available in 22 oz. and 56 oz. cartridges for application versatility
  • Manufactured in the USA using global materials
Model No. Option Packaging Qty. Carton Qty. Compatible Tools
ET-HP22 22 oz. side-by-side cartridge 1 10 EDT22S, EDTA22CKT or EDTA22P dispensing tools / EMN22i mixing nozzle
ET-HP22-N 22 oz. side-by-side cartridge 1 10 EDT22S, EDTA22CKT or EDTA22P dispensing tools / EMN22i mixing nozzle
ET-HP56 56 oz. side-by-side cartridge 1 6 EDTA56P dispensing tool / EMN22i or EMN50 mixing nozzles
ETHP100KT 100 gal. kit 1 Metering pumps offered by third-party manufacturers.
ETHP10KT 10 gal. kit 1 Metering pumps offered by third-party manufacturers.
ETHP1KT 1 gal. kit 1 1 Metering pumps offered by third-party manufacturers.


  • Threaded rod anchoring and rebar doweling into concrete and unreinforced masonry
  • Suitable for horizontal, vertical and overhead applications
  • Multiple DOT listings

Product Includes

ET-HP22-N – One EMN22i mixing nozzle and one nozzle extension are supplied with each cartridge.


Resin – white, hardener – black. When properly mixed, ET-HP adhesive will be a uniform medium gray color.

Storage Conditions

For best results store between 45°F–90°F. To store partially used cartridges, leave hardened nozzle in place. To re-use, attach new nozzle.

Shelf Life

24 months from date of manufacture in unopened container


  • Surfaces to receive epoxy must be clean.
  • Base material temperature must be 50°F or above at the time of installation. For best results, material should be 70°–80°F at time of application.
  • To warm cold material, store cartridges in a warm, uniformly heated area or storage container. Do not immerse cartridges in water to facilitate warming.
  • Mixed material in nozzle can harden in 30 minutes at temperatures of 70°F and above.


  • The load tables list values based upon results from the most recent testing and may not reflect those in current code reports. Where code jurisdictions apply, consult the current reports for applicable load values.
  • Use only Simpson Strong-Tie® mixing nozzles in accordance with Simpson Strong-Tie instructions. Modification or improper use of mixing nozzle may impair ET-HP adhesive performance.

Clean Up

Uncured material — Wipe up with cotton cloths. If desired scrub area with abrasive, waterbased 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 ET-HP® adhesive have been tested in accordance with ICC-ES Acceptance Criteria for Post-Installed Adhesive Anchors in Masonry Elements (AC58) and Adhesive Anchors in Concrete Elements (AC308).

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 133°F (56°C)
Glass transition temperature ASTM D648 168°F (76°C)
Bond strength (moist cure, 60°F) ASTM C882 2,300 psi (2 days)
2,440 psi (14 days)
Water absorption ASTM D570 0.34% (24 hours)
Compressive yield strength (cured 60°F) ASTM D695 16,300 psi (7 days)
Compressive modulus ASTM D695 595,500 psi (7 days)
Gel time ASTM C881 10 minutes – 60 gram mass
30 minutes – thin film
Shore D Durometer ASTM D2240 87
Volatile Organic Compound (VOC) 3 g/L

Suggested Specifications

Anchoring adhesive shall be a two-component high solids epoxy based system supplied in manufacturer's standard side-by-side cartridge and dispensed through a static-mixing nozzle supplied by the manufacturer. Epoxy shall meet the minimum requirements of ASTM C-881 specification for Type I, II, IV, and V, Grade 3, Class B and C, except gel time, and must develop a minimum 13,390 psi compressive yield strength after 7 day cure. Epoxy must have a heat deflection temperature of a minimum 168°F (76°C). Adhesive shall be ET-HP™ adhesive from Simpson Strong-Tie, Pleasanton, CA. Anchors shall be installed per Simpson Strong-Tie instructions for ET-HP™ adhesive.

ET-HP® Design Information

Cure Schedule

Base Material
Temperature °F
Base Material
Temperature °C
Cure Time
For water-saturated concrete, the cure times must be doubled.
50 10 72 hrs.
60 16 24 hrs.
80 27 24 hrs.
100 38 24 hrs.

In-Service Temperature Sensitivity

Base Material
Temperature °F
Base Material
Temperature °C
Allowable Load
1. Refer to temperature-sensitivity chart for allowable bond strength reduction for temperature. See Anchoring and Fastening Systems for Concrete and Masonry catalog, “Supplemental Topics for Anchors.”
2. Percent allowable load may be linearly interpolated for intermediate base material temperatures.
3. °C = (°F-32) / 1.8
40 4 100%
70 21 100%
110 43 100%
135 57 85%
150 66 69%

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