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Chemical anchor in hollow masonry

Find out how to fix metal anchor in hollow masonry substrate with Ceresit CF 850 or Ceresit CF 920.

Crucial to know

clean the hole before adhesive application

make a trial squeeze of the adhesive


Tools needed

a hammer drill

a hand pump

Step 1

A hole for a metal anchor

Drilling a hole

Holes to be drilled perpendicular to the surface of the base material by using a hard-metal tipped hammer drill bit. Drill a hole with nominal drill hole diameter and bore hole depth acc. to the size and embedment depth required be the selected anchor. In case of aborted drill hole the drill hole shall be filled with mortar.

  • Blow out from the bottom of the drill hole two times. Attach the appropriate sized brush (larger than the hole clearance) to a drilling machine or a battery screwdriver and brush the hole two times. Finally blow out the hole again two times.
  • Insert the sleeve flush with the surface of masonry. Use sleeves that have the right length only. Never cut the sleeve except the sleeve 16×130/330.

For installing the sleeve 16×130/330 measure the required length of sleeve, cut the sleeve from the top and set the cap on it before pushing it through the fixed element.

Step 2

Mortar application

Remove the cap and attach the supplied static-mixing nozzle to the cartridge and load the cartridge into the correct dispensing tool.

  • Cut off foil clip before use. For every working interruption longer than the recommended working time as well as for new cartridges, a new static-mixer shall be used.
  • Prior to dispensing into the drill hole, squeeze out separately a minimum of three full strokes and discard non-uniformly mixed adhesive components until the mortar shows a consistent grey colour.
  • Starting from the bottom or back of the hole, fill the hole up with adhesive. For quantity of mortar attend cartridges label or installation instructions. The position of the embedment depth shall be marked on the threaded rod.

Observe the gel-/working time.

Step 3

Metal anchor installation

Push the threaded rod into the drill hole while turning slightly to ensure positive distribution of the adhesive until the embedment depth is reached. The anchor shall be free of dirt, grease, oil or other foreign material.

  • Allow the adhesive to cure to the specified time prior to applying any load or torque.
  • Do not move or load the anchor until it is fully cured.

After full curing, the add-on part can be installed with the max. torque.

Tips & Tricks

For professionals

What types of chemical anchors are available on the market? 

Chemical Anchoring is based on two different types of chemical systems:

Reaction resin mortar for use in solid natural stones, concrete substrates and in hollow bricks, with fast curing time (Ceresit offer).

Epoxy system for concrete use only and with slower curing time.

products used

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    CERESIT CF 850
    Polyester chemical anchor is a two-component, quick-setting adhesive based on reactive resins. 
  • ${/content/heliux/adhesive/ceresit/com/en/products/mortars-and-auxiliaries/central-pdp#/ceresit-cf-920/SAP_0201VIC013P9/searchResult.productFields.MainImageAltText}
    CERESIT CF 920
    Two-component, fast-setting injection mortar for anchoring based on reactive resins, styrene free. It is characterized by high load carrying capacity. 

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