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Epoxy · vinylester · hybrid
Chemical anchors – injection mortars
Injection mortars with threaded rods – the flexible, high-load solution.
التفاصيل والجداول →
Solution · Chemical anchors
Chemical anchors – when the concrete is already there
Bonded anchors and post-installed rebar in epoxy, vinylester and hybrid mortars – for base plates on existing slabs, retrofits, starter bars and anchors close to edges – designed to EN 1992-4, ACI 318 and AS 5216 with approved systems.
- M8 – M30+
- Anchor rods Ø8 – Ø40 rebar
- 0
- Expansion force on the concrete close edges and spacing
- C1 / C2
- Seismic categories with approved products
- ETA · ESR
- Approved systems only
What a chemical anchor is – and why it is used
A chemical anchor is a threaded rod or reinforcing bar set in a drilled hole filled with a two-part resin mortar. Once cured, the mortar bonds the steel to the concrete along the whole embedment depth. Because nothing expands in the hole, the anchor does not push the concrete apart – so it can sit close to an edge or to another anchor, and it seals the hole against water.
That makes chemical anchors the standard answer whenever steel has to be fixed to concrete that is already hardened: a new column on an existing slab, a cast-in bolt that was missed or set in the wrong place, a starter bar for an extension, a heavy machine or a seismic retrofit. World Steel designs, supplies and installs approved systems with the bolts and anchor bolts of our steel packages.
Post-installed range
Chemical and mechanical anchors
Each system has its own page with types, approvals and ordering data.
Glass · foil capsule
Chemical capsule anchors
Pre-measured capsules for repetitive anchors at a fixed depth.
التفاصيل والجداول →5.8 · 8.8 · A4
Anchor rods & internally threaded sleeves for chemical anchors
Anchor rods and internally threaded sleeves matched to the approval.
التفاصيل والجداول →Ø8 – Ø40
Post-installed rebar connections
Starter bars and lap splices bonded into existing concrete.
التفاصيل والجداول →Wedge · sleeve · screw
Mechanical anchors – wedge, sleeve & screw
For loads needed now – no cure time.
التفاصيل والجداول →
Cast-in
Anchor rods ASTM F1554 – Grade 36, 55 & 105
For new foundations – cast-in anchor rods and cages.
التفاصيل والجداول →When to use them
Typical chemical anchor jobs
Hardened concrete, a steel member to fix and no cast-in bolt – the classic chemical anchor situation.
base plates
New columns on existing slabs
Mezzanines, canopies, extensions and racking on a finished floor.
rebar
Starter bars and extensions
New walls, slabs and stairs connected to existing concrete.
repair
Missing or misplaced bolts
Replacing cast-in anchors that were forgotten, cut or set out of position.
heavy duty
Machines and equipment
Vibrating plant, cranes rails and tanks with high or dynamic loads.
close spacing
Near edges and in groups
Parapets, beams and narrow piers where expansion anchors would split the concrete.
C1 / C2
Retrofit and seismic
Strengthening of existing buildings with approved seismic systems.
التطبيقات
Why engineers choose chemical anchors
01
Small edge distance & spacing
No expansion stress – anchors fit where mechanical anchors would split the concrete.
02
High loads
Bond along the full depth; embedment can be increased for more capacity.
03
Sealed, corrosion-safe hole
Mortar fills the gap – water cannot reach the rod.
04
Flexible positions
Drill through the base plate after the steel is set – holes always line up.
05
Rebar connections
Post-installed bars designed like cast-in reinforcement.
06
Cracked concrete & seismic
Approved products qualified for cracks and earthquake loading.
المعايير والامتثال
Design and approval codes
Chemical anchors are designed with the characteristic values in the product approval:
Vietnam & Asia
- EN 1992-4 · ETAUsed in practice for design and approval
- TCVN 5574Concrete and reinforced concrete structures
- QCVN 02:2022/BXDNatural conditions – seismic zoning
United States
- ACI 318-19 Ch. 17Anchoring to concrete
- ACI 355.4Qualification of adhesive anchors
- ICC-ES AC308Acceptance criteria – ESR reports
- ACI/CRSIAdhesive anchor installer certification
Australia / NZ
- AS 5216Post-installed and cast-in fastenings
- AS 3600Concrete structures
- NCC Volume OneStructural provisions
Europe
- EN 1992-4Design of fastenings in concrete
- EAD 330499Bonded fasteners – ETA
- EAD 330087Post-installed rebar with mortar
- EOTA TR 049Seismic categories C1 / C2
ملخص للاسترشاد فقط – تسري مواصفات المشروع وإصدار المعيار المعتمد والجهة المختصة.
الهندسة
Bond instead of expansion
Cast-in anchors bear on their head; expansion anchors wedge against the hole; undercut anchors key into a cone. A bonded anchor transfers load by bond stress along its full embedment – which is why it works close to edges and other anchors, and why its capacity grows with depth.
الهندسة
Which mortar for which job
Epoxy mortars give the highest bond, long working time and the broadest approvals for rebar and seismic use, but cure slowly in the cold. Vinylester and hybrid mortars cure fast and handle a wide temperature range; polyester is an economical choice for light, non-structural fixings and masonry. Capsules pre-measure the resin for repetitive work.
الهندسة
Installation decides the capacity
Drill, clean, prime the mixer, inject from the bottom, insert the rod, wait for the cure. Hole cleaning – blow, brush, blow – is the step that most often goes wrong: dust left in the hole acts like a release agent and can take away most of the bond.
Our crews install to the manufacturer's printed instructions, record every anchor and carry out proof-load tests where the specification asks for them.
الهندسة
Designed against every failure mode
Steel failure, bond pull-out, concrete cone, splitting, edge breakout and pry-out are all checked to EN 1992-4, ACI 318 Chapter 17 or AS 5216 using the characteristic bond strengths, edge distances and factors in the product approval – never a generic value from a catalogue.
الهندسة
Chemical, cast-in or mechanical?
Pour new foundations with cast-in anchor bolts. Fix to hardened concrete with chemical anchors when loads are high, edges close or rebar is involved. Use mechanical anchors where the load is needed immediately and space allows.
Take extra care with high service temperatures, fire exposure, sustained overhead tension and hollow masonry – approved products, certified installers and the right sleeves are required.
Reference data
Chemistries and leading brands
Product names below are trademarks of their owners and are listed for reference only. World Steel is not affiliated with these manufacturers; we supply and install the approved system specified by the engineer, or propose an approved equivalent. Always check the current ETA or ICC-ES report.
| Type | Cure | Load level | Approvals typically available | Best for |
|---|---|---|---|---|
| Epoxy | Slow (hours – days, temperature-dependent) | Highest | Cracked concrete, seismic C1 / C2, rebar, sustained load | Heavy structural anchors, deep embedment, rebar |
| Vinylester (styrene-free) | Fast (minutes – hours) | High | Uncracked and, for some products, cracked concrete | General structural work with quick turnaround |
| Hybrid (vinylester / cement, acrylic) | Fast | High | Cracked concrete, rebar (product-specific) | Base plates, rebar, cold or damp sites |
| Polyester | Fast | Light – medium | Mostly uncracked concrete and masonry | Non-structural fixings, masonry with sleeves |
| Capsule (glass / foil) | Fast | High | Per capsule system | Repetitive anchors at fixed depth |
| Cementitious mortar | Slow | High | Fire-resistant rebar connections (product-specific) | Rebar where fire resistance governs |
| Brand | Product | Type | Typical use |
|---|---|---|---|
| Hilti | HIT-RE 500 V4 | Epoxy | Heavy-duty anchoring and rebar, seismic |
| Hilti | HIT-HY 200-R V3 | Hybrid | Rebar connections and structural base plates |
| Hilti | HIT-RE 100 · HIT-HY 170 · HVU2 | Epoxy · hybrid · foil capsule | Anchoring in concrete and masonry; capsule anchoring |
| fischer | FIS EM Plus | Epoxy | High loads, rebar, cracked concrete |
| fischer | FIS V · FIS HB / FHB II | Vinylester · Highbond system | General anchoring; high-performance anchors and capsules |
| Simpson Strong-Tie | SET-3G · ET-3G | Epoxy | Threaded rod and rebar in cracked / uncracked concrete |
| Simpson Strong-Tie | AT-3G | Hybrid acrylic | Fast cure, cold and wet concrete |
| DEWALT | Pure110+ · Pure220+ | Epoxy | ICC-ES ESR-3298 / ESR-5144 anchoring and rebar |
| DEWALT | AC100+ Gold · AC200+ | Fast-cure adhesive | ICC-ES ESR-2582 / ESR-4027 general anchoring |
| Sika | Sika AnchorFix-3001 · AnchorFix-3+ | Epoxy-based | Structural anchoring and rebar |
| Ramset (AU / NZ) | ChemSet Reo 502 Plus | Epoxy | Anchor studs and rebar to AS 5216 |
| Würth | WIT-PE 500 · WIT-VM 250 | Epoxy · vinylester | Rebar and heavy anchoring · general anchoring |
| Rawlplug | R-KEX II · R-KER II | Epoxy · vinylester | Heavy-duty and general anchoring |
| Question | Why it matters |
|---|---|
| Cracked or uncracked concrete? | Tension zones and seismic design need a product qualified for cracked concrete. |
| Loads, edge distances, spacing? | Decide rod size, embedment and whether bonded anchors are needed at all. |
| Rebar or anchor? | Post-installed rebar needs an EAD 330087 / ACI 318 rebar approval. |
| Hole condition? | Dry, damp, water-filled or diamond-cored holes change the approved capacity. |
| Base and service temperature? | Sets gel and cure time, and the long-term temperature range. |
| Sustained tension, overhead? | Creep-qualified product and, under ACI 318, a certified installer. |
| Fire resistance? | Use the product's fire test data or protect the fixing. |
المواصفات
What we supply
- Mortars
- Epoxy, vinylester, hybrid, polyester, capsules – approved systems from leading manufacturers
- Rods
- M8 – M30+ in 5.8, 8.8, A4-70 / A4-80, HCR; rods and sleeves
- Rebar
- Ø8 – Ø40 starter bars and laps – post-installed rebar
- Design
- EN 1992-4, ACI 318 Ch. 17, AS 5216 calculations with the product approval
- Installation
- Trained crews, drilling and cleaning tools, installation records
- Testing
- On-site proof-load (tension) tests where specified
- With the steel
- Base plates drilled to suit, bolts and anchor bolts in the same package
العملية
How we deliver chemical anchors
- 1
Survey
Concrete class, cracks, edges, reinforcement scan.
- 2
Design
Anchor layout to EN 1992-4 / ACI 318 / AS 5216.
- 3
System
Approved mortar and rods for the conditions.
- 4
Install
Drill, clean, inject and set to the MPII.
- 5
Cure & test
Cure time, torque, proof-load tests.
- 6
Records
Anchor log, approvals and test reports.
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FAQ
الأسئلة المتكررة
What is a chemical anchor (bu lông hoá chất)?
A threaded rod or rebar bonded into a drilled hole in hardened concrete with a two-part resin mortar. The bond along the whole embedment carries the load without expanding against the concrete.
When should I use a chemical anchor instead of a mechanical one?
When loads are high, anchors are close to edges or each other, rebar has to be connected, the concrete may be cracked or seismic, or the hole must be sealed. Mechanical anchors are better when the load is needed immediately.
How long before a chemical anchor can be loaded?
Until the full cure time in the product table for the base temperature – from under an hour for fast mortars in warm concrete to a day or more for epoxies in cold concrete.
Are chemical anchors suitable for fire exposure?
Resins lose strength at high temperature. Where fire resistance is required, use the product's fire test data, a fire-rated mortar or protect the fixing.
Which brand is best?
The best system is the one approved for your conditions – cracked or uncracked concrete, rebar, seismic, hole condition and temperature. We work with the system the engineer specifies, or propose an approved equivalent.
Can chemical anchors be used in brick or block?
Yes, with mortars approved for masonry and perforated sleeves in hollow units – capacities are much lower than in concrete.
Fixing to existing concrete?
Send the loads, the anchor layout and photos of the concrete – we return the anchor design, approved system and an installed price.