Chemical Anchors – Expandet

Chemical Anchoring

When to use Chemical Resin Anchors   

If you need to fix something close to the edge of a brick or stone because you intend to hang a gate or add a small fixing, anchors that expand can cause strength-ruining splits and cracks in the masonry. If the structure is subject to dynamic loads, vibration or wind, then chemical anchoring is preferable over mechanical anchoring. These resin anchors will take massive loads, but preparation is important.

How to use Chemical Resin Anchors

To use chemical resin and anchors together, ensure that you make an appropriate hole as recommended by the manufacturer’s catalogue in terms of diameter, depth and spacing.

If your drilled holes are likely to have voids (frequent in hollow blocks or bricks), you’ll need resin injection anchor sleeves to control the flow of resin and provide a secure fix to the substrate.


  • Remove any loose material from the hole to get the best hold against a debris-free surface. Use a resin hole brush to do this. Also use a tube to blow air into the hole to get rid of more debris.

  • Using an applicator gun, inject the resin into the hole.




It is important to make sure it’s mixing properly before you inject it into the holes. It’s advised to let some out first to allow it to mix.

Always ensure that the nozzle width and length are correct, and make sure to slowly withdraw the nozzle, so trapped air pockets don’t happen.

For deeper holes use a resin nozzle extension tube on the end of a mixer nozzle.

  • In general filling about 70% of the hole will suffice to get complete coverage.
  • Mask the Threaded Stud With Electrical Tape– Make sure that the tape goes over the part required to take the nut, to avoid resin contamination, which might block the threads.

  • As you push the stud in the hole, twist it a few times to break any air bubbles up. It also pushes the resin into any voids in the hole.

If the stud keeps pushing itself back out it may need a few more twists. All the threads should have an even covering.

  • Once all the studs are in, you’ll have to leave them alone. How long this takes will depend on the brand of resin as well as the temperature. Resin tubes will have a guide on the label: a gel time and full cure time. Don’t load the studs until the full cure time.

EXPANDET Injection Mortar

Styrene free injection mortar for fixing of:
Threaded rods, internally threaded sockets etc in concrete & other building materials
Threaded rods & sleeves in solid brick, hollow brick, aerated concrete and Leca
Post-installed reinforcement bars in concrete.
Can be used close to the edge and with a small spacing.
For fixing of signages subject to wind loads
Suitable for underwater fixing
Can be used with a standard Silicon Gun.
Anchorages can be designed in Expandet Anchor Calculation
Programme. For download go to

ETA approved in Option1 for Cracked and Non Cracked Concrete applications.

Download Catalogue

Injection Gun

Threaded Rod Chemical Anchor

Threaded rod for fixing with Styrene free injection mortar and Chemical Anchor.

Available in zinc plated.
Hot dipped galvanised & SS A4 available on request.

Socket Anchor with Internal Thread




Download Product Catalogue