Extended coverage flexible thin-set mortar

  • For interior and exterior application – freeze/thaw stable
  • Superior non-sag characteristic, exceeding industry standards
  • New mortar lightweight generation with easy trowel technology and extended bucket time
  • For all approved substrates and covering materials
  • Improved flexural strength
  • Excellent-sag characteristics for large format tile exceeding industry standards
  • Neutral mortar color
  • Interior and exterior and submergible applications
  • Extended coverage; minimum 30% more than a standard 50lbs bag
  • Self-curing
  • 38% post-consumer recycled content
  • Real multipurpose properties
  • SuperTec-technology for dense mortar matrix

A new generation of cement-based flexible, acrylic polymer, thin-set mortar with extended coverage, excellent bonding strength and easy handling according to EN 12 004 C2 TE-S1 and ANSI A 118.4.. For almost all substrates in interior and exterior applications. For almost all covering materials, including ceramic and quarry tile installations, porcelain stoneware, porcelain and glass mosaic, clinker and brick tile. Because of its high polymer content, the adhesive can also be used over substrates such as in-situ concrete (at least 3 months old), prefabricated concrete elements, gypsum fiberboard, sheetrock, heated screed (follow corresponding regulations and data sheets), poured mastic asphalt and autoclaved aerated concrete (AAC) as well as balconies, patios and exterior walls. Servolight can also be used for underwater installations (swimming pools), even of glass mosaic and can be used to fill holes and level substrates up to ¾“ (15 mm) thickness.


The substrate must be ready for use, clean and stable. Prime absorbent surfaces with Okatmos® DSG or Okatmos® UG 30 indoors. Prime calcium sulphate screeds with Okatmos® DSG or Okapox GF when exciding mortar thickness over 5 mm/3/16”.

Expansion joints shall be provided through the tile work from all construction or expansion joints in the substrate. Follow recent TTMAC and ANSI specification A108.01-3.7 “Requirements for Movement Joints: Preparations by Other Trades” or Tile Council of North America (TCNA) detail EJ-171 “Movement Joints—Vertical & Horizontal.” Do not cover expansion joints with mortar.

Thoroughly clean non-absorbent substrates, e.g. Terrazzo, old ceramic coverings with Okamul GR Basic Cleaner, allow to dry and prime with Okatmos® DSG or Okatmos® UG 30*.

Thoroughly clean old, firmly adhering homogeneous VCT coverings in a dry indoor area with Okamul GR Basic Cleaner, allow to dry, sand and vacuum with an industrial vacuum cleaner. Then prime with Okatmos® UG 30 or Okatmos® DSG. Check local building laws/recommendations when dealing with asbestos-based VCT.

Mix Servolight with clean, cool water to a smooth texture using a proper amount of water. If necessary, adjust mortar consistency by adding small quantities of water. Allow mixture to slake for approx. 5 minutes and stir again. Use appropriate notched trowel (see table) to apply mortar onto a substrate, slide the covering material into the adhesive bed within 30 minutes and press tightly. Depending on the absorbency of the substrate/covering corrections can be made within 25 minutes.


light grey


interior, exterior and underwater, walls and floors **


max. 9/16“ (15 mm)

Application temperature

41 °F to 77 °F (+5°C to +25°C) (substrate)

Temperature tolerance

-4 °F to 176 °F (-20°C to +80°C)

Water demand

approx. 2.1 US gal./bag (approx. 8,0 l/15 kg powder)

Slake time

approx. 5 minutes (re-mix)

Processing time*

approx. 3 hours

Processing time*

approx. 30 minutes

Walkable after grouting*

after approx. 12 hours

At 68 °F (+20 °C) and 65 % relative humidity. Higher temperature and low humidity decreases, lower temperature and high humidity increases this value respectively

Coverage depends on the substrate condition and other factors.

Tile dimensions Square notched trowel size Coverage (powder)
up to 2“ (< 50 mm) 1/8“ x 1/8“ x 1/8“ notch (3 mm)

230 sqft. per bag (approx. 0,7 kg/m2)

4 - 8“ (109 - 200 mm) ¼“ x ¼“ x ¼“ NTCA G3 (6 mm)  124 sq ft. per bag (approx. 1,3 kg/m2)
over 8“ (> 200 mm) 5/16“ x 5/16“ x 5/16“ or equivalent or larger (min. 8 mm) 

90 sq ft. per bag (approx. 1,8 kg/m2)

Coverage is approximate and is given for estimating purposes only. It may vary according to substrate conditions and other factors.

Clean tools and tile surfaces immediately with water.

Description Item No. EAN
54x 15 kg / 33 lbs. paper bags80010

The aforementioned information, especially the proposals for processing and utilizing our product, is based on our knowledge and experience. We recommend that you carry out your own tests in every case to ensure the suitability of our products for the intended process and processing purposes because of the different materials and the working conditions which lie beyond our area of influence. No liability can be derived from this advice or from verbal advice, unless we are responsible for (criminal) intent or gross negligence in this respect.