Mortar for tongue-and-groove blocks PHL

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Product description

Fescon Mortar for Tongue-and-groove Blocks PHL is a dry mortar for the thin-jointing of lightweight aggregate blocks. The maximum grain size is 1.2 mm. Fescon Stone Adhesive is used for the thin-jointing of sand-lime bricks. 

  • Easy to use
  • Good workability characteristics
  • Frost-resistant
  • Low water absorption capacity


  • For thin-joint masonry both indoors and outdoors
The product is listed in the portal for building products that can be used in Nordic Swan Ecolabelled buildings.
GTIN code Product name Product number Package size
6416841530196 Mortar for tongue and groove blocks PHL 53019 25 kg
6416841330161 MORTAR FOR TONGUE-AND-GROOVE BLOCKS PHL 33016 500 kg
6416841330192 MORTAR FOR TONGUE-AND-GROOVE BLOCKS PHL 33019 1000 kg

Refer to the bag for how much water the plaster requires. Add the dry material to the water and mix with a concrete mixer for around ten minutes. With a power mixer or a drill paddle, around two to three minutes of mixing is sufficient. Allow the plaster to stand for around ten minutes and mix it again for a short while. Find the correct consistency at this stage by gradually adding the rest of the water. We do not recommend adding all of the water right at the start. The finished plaster remains workable for around three hours.

Work instructions

The lowest working temperature is +5°C. The temperature of the stones must be above 0°C. Follow the instructions of the designers and official regulations in masonry work. National Building Code of Finland B5 and National Building Code of Finland B8, and RYL 2000 instructions.

Storage and handling of waste
See the separate storage and disposal instructions

Material usage

0.5 kg/H-75

1.5 kg/UH-100…UH-150

2.5 kg/RUH-200…RUH-380

Water requirement 3.5 l / 25 kg bag
Finished compound 13 - 14 l / 25 kg bag
Type powder
Colour gray
Maximum grain size

1.2 mm

Package size 25 kg, 500 kg and 1000 kg

storage time in a dry location approx. 1 year

Lowest usage temperature


Workability time 3 h
Strength class M 10
Nominal shear resistance

> 0.354 N/mm2

Reaction to fire A1
Heat conductivity 0.83 W/mK
Frost resistance yes
Water vapour permeability

µ 15/35