Cekol C-40 Plasterboard joint compound

  • Does not require the use of tape
  • Contains fibres
  • For persistent cracks
  • Flexible
Cekol C-40

Patching mortar for grouting of plasterboard panels

• CEKOL C-40 is an excellent material for pointing of plasterboard panels without using a strengthening tape.
• It is also used to refill cracks and scratches formed on the surface of walls and ceilings.
• It contains special cellulose and polyamide fibres.
• CEKOL C-40 is recommended for indoor use only.
• It is a dry compound of top quality plaster stones, white mineral fillers and modifiers.
• CEKOL C-40 meets the requirements of EN 13963 type 4B as a mixture with a standard setting time.


Preparation of the substrate

Using a spatula, remove the remains of emulsion and oil paints, and loose grains of sand. The substrate should be clean, tight, free of grease. Before pointing the plasterboard panels, the groove should be carefully cleaned.


Highly absorbent substrates and cut-to-size pieces of plasterboard panels should be primed with CEKOL DL-80 GOLD deep penetrating primer.

Preparation of the mortar

The mortar should be prepared by pouring 1 kg of powder to about 0.45 l of water. Leave for 2 minutes, then mix thoroughly.


The mortar should be used within 30 minutes. Consumption: about 7 linear meters of joint from 1 kg of powder. Temperature of application +5 ÷ +25°C.

Further works

Final smoothing of the surface may be done with abrasive paper or grinding mesh, after full setting.

Technical data

  • Meets requirements EN 13963 Type 4B
  • Proportions of the mixture 0.45 l of water for 1 kg of dry powder
  • The mortar should be used within 30 minutes
  • Consumption about 7 linear meters of joint from 1 kg of powder
  • Working temperature +5 ÷ +25°C
  • Adhesion to substrate plasterboard panel: ≥0.4 - concrete: ≥1.0
  • Joint strength >350 N
  • Setting time 60 minutes
  • Reaction to fire A1
  • The product has a hygienic approval

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