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Chemical Anchors FAQs

Frequently Asked Questions

What is Chemical Anchoring?

Chemical anchoring is a method of fastening in which a metal insert is bonded to concrete. At Hilti we have two types of chemical anchors, Resin Epoxy and Hybrid Adhesives, that are designed to give the installer greater flexibility depending on the application.

Chemical anchors can be used in a variety of different applications but some of the most common ones are:

  • Rebar Doweling
  • Base Plate Installation
  • Hollow Block Fastenings
  • Fastening fixtures to Masonry

What is a Resin Epoxy Anchor?

Resin epoxy anchors are designed to harden (cure) slowly, which gives the installer more time to work and finish the installation.

When do you use a resin epoxy anchor?


Resin epoxy anchors are very useful when installing rebar or threaded rod into deep holes or embedments. With a longer working time, resin epoxy anchors provide the installer great flexibility and more time to fill the hole and insert the anchor element.  

Where do you use a resin epoxy anchor?

Resin epoxy anchors can be used in a variety of different applications, but the base material is usually concrete. Typical applications that utilize these anchors are rebar doweling and anchoring.

How do Hilti resin epoxy anchors work?

Resin epoxy anchors are a mixture of two chemical parts, Part A, the Epoxy Resin (larger part), and Part B, a hardener (smaller part), that when mixed creates a bond between the anchor element and the concrete.

How strong are resin epoxy anchors?

The strength of any chemical anchoring fastening point is determined by a multitude of factors. The main factors are: the diameter of the rod or rebar, the depth of the hole (embedment), and the condition of the concrete (wet or dry) at installation. These three factors affect bond strength and are critical in calculating the load capacity of any chemical anchor.

What are the cure times for resin epoxy anchors?

Cure time refers to lengths of time needed for chemical anchors to fully cure before you can place loads or remove concrete formwork. Resin epoxy anchors have slower cure times compared to hybrid adhesive anchors. 

What is a hybrid adhesive anchor?

Hybrid adhesive anchors are designed to harden (cure) quickly, reducing the time you have to wait before loading the anchor.

When do you use a hybrid adhesive anchor?

Hybrid adhesive anchors can be used in a variety of different applications and base materials. Base materials are usually concrete, grout-filled block, hollow block, and other masonry base materials depending on the hybrid adhesive selected for the application. Typical applications that utilize these anchors include rebar doweling and anchoring.

How do Hilti hybrid adhesive anchors work?

Hybrid adhesive anchors are a mixture of two chemical parts, Part A, a hybrid adhesive (larger part), and Part B, a hardener (smaller part), that when mixed creates a bond between the anchor element and the base material.

How strong are hybrid adhesive anchors?

The strength of any chemical anchoring fastening point is determined by a multitude of factors. The main factors are: the diameter of the rod or rebar; the depth of the hole (embedment), and the condition of the base material (wet or dry) at installation. These three factors affect bond strength and are critical in calculating the load capactiy of any chemical anchor.

What are the cure times for hybrid adhesive anchors?

Cure time refers to the length of time needed for chemical anchors to fully cure before you can place loads or remove concrete formwork. Hybrid adhesive anchors have faster cure times compared to resin epoxy anchors.

Additional Technical Resources

PROFIS Engineering

PROFIS Engineering

Our cloud-based anchor design software enables automatic and advanced calculating, easy specifying and integrated BIM modeling - increasing productivity and improving value.

Use PROFIS Engineering
Adhesive Anchor Volume Calculator

Adhesive Anchor Volume Calculator

The Hilti Adhesive Anchor Volume Calculator allows you to compare product options, and even modify your calculations based on the specific installation conditions at your job site.

Use the adhesive anchor volume calculator
Anchor Design Center

Anchor Design Center

The anchor design center contains resources for all your concrete anchoring applications from white papers, approvals/reports, technical data, submittals, CAD details, and case studies.

Use the anchor design center
Ask Hilti

Ask Hilti

Ask Hilti is an online community offering collaboratively edited expert advice and continuing education to engineers. All continuing education material has been accredited through NCSEA or AIA.

Get your questions answered with Ask Hilti

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