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ET-HP® Epoxy Adhesive

We have discontinued our ET-HP product line and transitioned to ET-3G®. Find more information about this transition here.

ET-HP is a two-component, high-solids, epoxy-based system for use as a non-shrink anchor-grouting material. ET-HP is formulated for anchoring threaded rod and rebar into concrete (cracked and uncracked) and masonry (uncracked).

Key Features

  • Jobsite versatility — can be specified for dry and damp conditions when in-service temperatures range from -40°F (-40°C) to 150°F (65°C)
  • Permissible for use with metric threaded rod and rebar
  • Multiple State and DOT approvals
  • Easy hole-cleaning — no power-brushing required
  • Manufactured in the USA using global materials
Mix Ratio/Type 1:1 epoxy
Mixed Color Gray
Base Materials Concrete — cracked and uncracked
Masonry — uncracked
Unreinforced Masonry (URM) — uncracked
Base Material Conditions Dry, water-saturated
Anchor Type Threaded rod or rebar
Substrate Installation Temperature 50°F (10°C) to 100°F (38°C)
In-Service Temperature Range -40°F (-40°C) to 150°F (65°C)
Storage Temperature 45°F (7°C) and 90°F (32°C)
Shelf Life 24 Months
Volatile Organic Compound (VOC) 3 g/L


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


  • Surfaces to receive epoxy must be clean.
  • Base material temperature must be 50°F (10°C) or above at the time of installation. For best results, material should be 70°F (21°C) to 80°F (27°C) 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 or use microwave to facilitate warming.
  • Mixed material in nozzle can harden in 30 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 ET-HP adhesive performance.
  • For full instructions, see Adhesive Anchoring Installation Instructions.

Test Criteria

  • ET-HP has been tested in accordance with ICC-ES AC308, AC58, AC60, ACI 355.4 and applicable ASTM test methods.

Cure Schedule

Base Material
Temperature °F
Base Material
Temperature °C
Gel Time (mins.) Cure Time (hrs.)
1. For water-saturated concrete, the cure times must be doubled.
50 10 45 72
60 16 30 24
80 27 20 24
100 38 15 24

ET-HP Typical Properties

Property Class B Class C Test Method
(40°–60°F) (>60°F)
Consistency Non-sag Non-sag ASTM C881
Bond Strength, Slant Shear Hardened to Hardened Concrete, 2-Day Cure1 1,300 psi 2,300 psi ASTM C882
Hardened to Hardened Concrete, 14-Day Cure1 1,750 psi 2,400 psi
Fresh to Hardened Concrete, 14-Day Cure2 2,800 psi 2,800 psi
Compressive Yield Strength, 7-Day Cure2 11,800 psi 16,300 psi ASTM D695
Compressive Modulus, 7-Day Cure2 453,000 psi 595,000 psi ASTM D695
Heat Deflection Temperature, 7-Day Cure2 133°F (56°C) ASTM D648
Glass Transition Temperature, 7-Day Cure2 121°F (49°C) ASTM E1356
Decomposition Temperature, 24-Hour Cure2 500°F (260°C) ASTM E2550
Water Absorption, 24-Hours, 7-Day Cure2 0.34% ASTM D570
Shore D Hardness, 24-Hour Cure2 86 ASTM D2240
Linear Coefficient of Shrinkage, 7-Day Cure2 0.001 in./in. ASTM D2566
Coefficient of Thermal Expansion2 2.1 x 10-5 in./in.°F ASTM C531
  1. Material and curing conditions: Class B at 40° ± 2°F, Class C at 60° ± 2°F.
  2. Material and curing conditions: 73° ± 2°F.

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.

Related Literature

Code Reports & Compliance