Cempoxy Mortar Paste


Cemix® Cempoxy Mortar Paste is a two part thixotropic epoxy mortar/paste. It is gunable and trowelable. It has excellent adhesion to most materials including concrete, metals, brick, ceramic, and glass etc. Cemix® Cempoxy Mortar Paste is non-shrink and has excellent chemical resistance.

Typical Application / Uses:

  • Bedding and joining of precast concrete units.
  • Grouting of horizontal starter bars and bolts.
  • Repair of spalling concrete and protection of reinforcing.
  • Fabrication of concrete pipe intersections.
  • Tiling adhesive.
  • Bonding of aggregates to concrete and other surfaces for decorative finishes.
  • As a general epoxy adhesive.


  • Versatile and durable.
  • High compressive strength.
  • High bond strength.
  • Non-shrink.
  • Good chemical resistance.
  • Gunable and trowelable.

5kg (3.1L)

Substrate Preparation:

Thoroughly clean the joining surfaces of all extraneous matter, especially oil and grease. Laitance should be removed from concrete surfaces mechanically or by acid etching. For best results, steel surfaces should be prepared by sand blasting or grinding. Remove all old surface coating, including paint, etc. from bonding surfaces.

Movement / Control Joints:

Honour any control joints in the concrete substrate – do not apply product over control joints. Create control joints in the mortar as required especially in long thin sections.


Mix product as per the whole units supplied or in a ratio of 2:1 if units need to be broken down. Ensure this amount can be used within its pot life. Mix thoroughly for a minimum of three minutes using a low speed drill (600rpm) and a mixing paddle. Keep the paddle below the surface material to avoid entrapment of air. Proper mixing may take 3 - 5 minutes. Thorough mixing of both components is important to obtain optimum results. Carefully scrape the sides and bottom to ensure thorough mixing. Mix until a uniform grey colour is achieved.


For jointing and as a general adhesive, apply a thin layer of Cemix® Cempoxy Mortar Paste to both surfaces and then press together. Support joint as required and do not disturb within 8 hours or until such time that the epoxy has gained sufficient strength. When using as a filling compound, apply a thin layer of Cemix® Cempoxy Mortar Paste to the surface of the area to be filled. Build up in layers as required. For patching or leveling, apply with a spatula or a trowel. To obtain a smooth surface keep the face of the trowel wet when finishing.

Technical Data:

Appearance - Grey

Strength (MPa) - 35 - 40 MPa @ 1 day; 55 - 65 MPa @ 7 days.

Application Temp – 10ºC – 35oC

Mix Ratio: 2:1 by weight.

Pot Life: Approx. 1 hour at 20ºC.

Bond Strength: 11MPa.

Specific Gravity (SG): 1.8

Viscosity – Thixotropic paste. Non-slump up to 15 – 20mm on vertical surface.

The data shown above reflects typical results based on laboratory testing under controlled conditions. Reasonable variations may occur on site.


  • Protect mortar from extreme temperatures, rain & water after application.
  • Do not allow mortar to drop below 10ºC until it has reached its minimum compressive strength.
  • Mix whole packs at a time; do not mix part packs.
  • Avoid entrapping air during mixing.
  • Larger volumes will generate heat & reduce pot life.


One (1) year in original unopened containers. Do not store opened containers.


Clean all tools & equipment before product hardens with Cemix® Cleaning and Thinning Solvent. Clean hands & skin with soap & warm water.


Do not apply product on to surfaces less than 10oC or more than 35oC. Do not use product in temperatures less than 10oC or more than 35oC.