Chemical anchor
A post-installed anchor using epoxy, hybrid resin, or polyester capsule to bond a threaded rod into concrete. AS 5216:2021. Hole prep is critical.
Ask Chalkline about this →A chemical anchor is a post-installed anchor system in which a two-part resin (epoxy, hybrid vinyl ester, or polyester) is injected into a pre-drilled hole in concrete or masonry before the threaded rod or rebar is inserted. As the resin cures, it forms a bond between the drilled-hole surface and the rod, transferring loads by adhesion rather than mechanical expansion. This avoids the radial expansion stress that can crack concrete near edges or in thin sections.
Chemical anchors come in two delivery systems: injectable cartridges (epoxy or hybrid mortar injected by a cartridge gun with a static mixer nozzle) and pre-packaged glass capsules (the rod is spun in to break the capsule and mix the resin). Injectable systems generally provide higher load capacity and more flexibility in hole diameter and depth. Epoxy resins are the strongest option and can be used in cracked, wet, or flooded holes when using a product rated for those conditions (e.g. Hilti HIT-RE 500 V4).
Hole preparation is the critical installation step: the drilled hole must be blown out and brushed clean before resin injection. Dust or water film between the resin and the concrete surface reduces pull-out capacity significantly. The anchor must not be loaded until the full manufacturer-specified cure time has elapsed.
For structural applications, chemical anchors must be designed in accordance with AS 5216:2021 by a qualified engineer. Products require prequalification to AS 5216 Appendix A, or a current European Technical Assessment (ETA) compatible with Appendix B.
Also known as: adhesive anchor, resin anchor, epoxy anchor, bonded anchor.
Category: Fixings and fasteners
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Last updated: 2026-05-11. Verified: 2026-05-11. Quarterly review for currency.