weber.xerm 850 Plus

Colour:
natural grey

Bed thickness:
up to 10 mm

Water demand:
approx. 8.0 - 9.0 liters / 25 kg

Storage:
The product can be stored at least 18 months in its original unopened packaging, if kept dry and protected from moisture.

Fields of application

weber.xerm 850 Plus is used to fix floor and wall ceramic tiles indoors and outside. Particularly used for all common tiles and non-moisture (discoloration)-sensitive natural stones.
As a flexible thin-bed or medium-bed adhesive it is a system component of the Weber bonded waterproofing solutions weber.tec 822 (1-comp. liquid foil), 824 (1-comp. cement-based slurry), Superflex D 2 and weber.xerm 844 (1-comp. quick-setting and reactive compounds) and also weber.tec 825 (waterproofing membrane).
Hence, for use in damp, wet-duty and cold storage rooms.
The following substrates among others are allowed: cement and anhydrite screeds (heated and nonheated), gypsum paperboards, gypsum fiberboards, cement and lime-cement plasters/renders, gypsum plasters and rigid foam boards.
For use indoors (walls and floors) and outdoors (walls).

Main features

• EMICODE EC 1: low emission of volatile substances
• class C2 TE: C2: pull-off strength ≥ 1.0 N/mm2 after all storage conditions– T: thixotropic, slip ≤ 0,5 mm – E: extended open time ≥ 30 minutes
• can be applied as a thin- or medium-bed adhesive
• no maturing time after mixing
• extended bonding open time
• very good slip resistance
• suitable on top of Weber bonded waterproofing systems
• convenient on several substrates and for numerous coverings
• convenient on heated floor constructions
• for levelling out unevenness and defects up to 10 mm thickness

General notes

• Limits of use: do not use weber.xerm 850 Plus for bonding “tile on tile” outdoors, in permanently wet areas and in areas permanently underwater (without waterproofing): in these cases, use the epoxy resin adhesive weber.xerm 847.
• For fixing ceramic tiles and natural stones on lightweight concrete, we recommend the flexible lightweight tile adhesive weber.xerm 854; check the compatibility of the natural stones on a trial area.
• weber.xerm 850 Plus is convenient for fixing tiles up to 30 x 60 cm.
• For bonding tiles > 30 x 30 cm on walls, use a tile adhesive of class “S 1”.
• For bonding tiles > 30 x 30 cm on floors also use a tile adhesive of class “S 1” and, if necessary, with flow-grade properties.
• For full information relating to allowed substrates and tile coverings, refer to the Weber “Overview of Tile Adhesives”.
• All characteristics mentioned in this data sheet are based on a temperature of +23 °C without draught and a relative humidity rate of 50%.
• Higher temperatures and lower humidity rates accelerate, lower temperatures and higher humidity rates delay the setting process.
• Comply with the national standards and/or guidelines, for ex. DIN 18157 “Execution of tilings and coverings” and the leaflets of ZDB (Central Association of German Construction Industry); if not issued and if necessary, request technical advice.
• For the installation of natural stone slabs, follow the supplier’s recommendations. If in doubt, carry out preliminary tests.
• Respect the maximum residual moisture content of the substrate at the time of installation of ceramic coverings and natural stones; it should not exceed 2.0% CM-% (by weight) in case of heated or non-heated cement screeds, 0.5% CM-% (by weight) in case of heated or nonheated anhydrite screeds, 1.0% CM-% (by weight) in case of gypsum plasters, and air-dry
  for cement and cement-lime renders/plasters. The moisture content must be measured with a carbide hygrometer (CM) as a rule.
• Do not install tiles, slabs or natural stones that have been stored damp, wet, or too cold.
• Protect the structure from moisture until the tile adhesive has completely set.
• Do not use a material that has already stiffened.

Special notes

• When levelling substrates with low compressive strength and bulk density (e.g. gypsum plasters, lightweight plasters, aerated concrete, etc.) or calcium sulphate screeds, apply the tile adhesive in a maximum thickness of 3 mm.
• Do not use in contact with non-ferrous metals, such as aluminium, copper, lead or zinc. Used stainless steel components, e.g. rails and edge protector angles.