Stone SX 20 trass Medium Bed Mortar

codex Stone SX 20 trass is a versatile, polymer-modified laying mortar for use in the centre-bed method. The addition of a proportion of trass reduces the tendency to efflorescence and discolouration.


For laying discolouration-resistant natural and concrete stone slabs as well as flooring with greater thickness tolerances or strongly profiled reverse sides.

  • For fine and rough ceramic tiles
  • For cotto, hand moulded and brick tiles
  • For concrete and natural stone slabs with low tendency to deformation and discolouration
  • On calcium sulphate and cement screed
  • On plaster, lime-cement and cement plaster and concrete
  • For indoor and outdoor use
  • For wall and floor coverings



  • For 3 - 20 mm mortar bed thickness
  • Trass additive against efflorescence and discolouration
  • Smooth and easy to apply
  • Load-bearing even with large and heavy panels
  • Waterproof and frost resistant
  • Extended open time
  • Meets the requirements C1 TE according to EN 12004

codex SX 20 trass is particularly suitable for laying natural and concrete stone.

Technical data

*At 23 °C and 50 % humidity.
Pack type

paper bag

Pack size

25 kg

Shelf life

12 months


light grey

Minimum working temperature

+ 5 to + 25 °C

Ideal working temperatures

+ 10 to + 25 °C

Water quantity required

5.5 - 6 litres/ 25 kg

Working Time/ Pot Life

approx. 4 hours*

Working time

30 minutes*

Set to foot traffic

after approx. 24 hours*

Ready for jointing

after approx. 24 hours*


after approx. 3 days*

Final strength

after approx. 28 days*


3.2 - 5.9 kg/m²

Ordering information

Article Article number Packsize Shipping unit
codex Stone SX 20 trass / 25 kg 62300 25 kg
Pallet :
42 bags

Quality seals and badges


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