weberxerm 847N epoxy resin



The substrate must be sufficiently solid, load-bearing, clean, dry, sound and free from cement laitance, dirt, oil, grease or any other adhesion-diminishing particles.

The residual moisture content of mineral substrates must be less than 4% by weight (measured with carbide hygrometer).

Completely remove stains of oil, grease, wax and cleaning agents with webersys 894 (ADEXIN ZE). Light stains of grease or wax (due to the use of household cleaners) must be removed with webersys 992 (thinner AX).

Check the bonding of weberxerm 847 on pretreated or factory-supplied non-glazed tiles and slabs in a pretest. If adhesion is insufficient, then roughen the substrate through sanding or sandblasting and check the adhesion again.

Larger cavities (honeycombs) or damaged areas must be repaired beforehand. Steel substrates must be treated with an anti-corrosion product. Afterwards it must be milled and cleaned.

Aluminum and stainless steel must receive a thin scratch layer of weberxerm 847. Afterwards the tiles are laid fresh-in- fresh onto the tile adhesive layer.


weberxerm 847 is delivered in 2 components (component A = resin base and component B = hardener).

The quantities of the components are precisely matched to each other in the factory.

Avoid using partial quantities whenever possible.

Pierce the larger container part at two spots with a steel drift to discharge the hardener completely into the resin base within the smaller container part. Both components are thoroughly mixed within the lower part of the container mechanically with a slow-speed electric drill and the webersys stirrer No. 2 or 8, depending on container size. Attention must be paid to bottom and walls of the container during mixing. This will prevent any inaccurate dosage. After mixing, no colour difference should be visible in the mixture.

The mixing time is at least 2 minutes.

When decanting the mixed components into an empty container after mixing and when mixing again for one more minute, the mixing will be improved. When using partial quantities, the mixing ratio given on the container label must be observed.

Immediately after mixing, the product must be applied.


• All characteristics are based on a temperature of +23°C without draught and relative humidity rate of 50 %.
• Higher temperatures and lower humidity accelerate, lower temperatures and higher humidity delay the course of the reaction.
• For installation the instructions specified in DIN 18157, the current ZDB leaflets as well as the applicable guidelines must be complied with. The respective maximum residual substrate moisture at the time of installation should not be exceeded.
• Do not install tiles, slabs, or natural stones that have been stored damp, wet, or too cold.

• In case of embedding rain gutter metal hanging fixtures on balconies and terraces, the fixtures must be fixed mechanical- ly with the substrate.
• weberxerm 847 is not convenient on existing ceramic coverings in outdoor areas (for ex. balconies or terraces) that are located above heated premises.
• High-quality reactive resins demand a compressive strength of ≥ 30 N/mm² and a pull-off strength of ≥ 1,5 N/mm² for concrete substrates.
• The temperature of the substrate must be at least 3°C above the dew point to reduce risk of condensation.

Apply weberxerm 847
a) either on the still tacky primer (without silica sand) or

b) or (if waiting times are longer) on the cured primer which has been strewn with kiln-dried silica sand (grain size 0.1 - 0.5 mm).

Apply weberxerm 847 in one coat on horizontal, vertical or inclined surfaces with the weber rake with the notched triangular blade No. 2 and immediately thereafter smooth in a uniform 0,2 mm thickness with the flat side of the rake. Consumption: approx. 2,4 kg/m2.

After approx. 24 to 48 hours (depending on air and substrate temperature) lay the ceramic tiles in thin-bed method with weberxerm 847. The notch size of the trowel may not exceed 6 mm.

For horizontal surfaces, weberxerm 847 may also be applied in the middle-bed method.

If ceramic tiles are subsequently laid with weberxerm 852, or weberxerm 858 Blue Comfort or weberxerm 853 F in the thin- bed or middle-bed method, then strew the fresh layer weberxerm 847 with weber kiln-dried silica sand (grain size 0,7-1,2 mm).

Sand off vertical surfaces with oil-free compressed air.

If the sealing tapes webertec 828 DB 75 or webertec 828 DB 150 are bonded with weberxerm 847, then the overlapping parts must first be cleaned with webersys 992 (thinner AX). Wait for evaporation of solvents before bonding.

Clean tools immediately after use with webersys 992 (thinner AX).


With official test certificates (FRG) according to EN 12004 (class R2 TE). 
With certification Det Norske Veritas for use on American cruiseliners.


Informasjonen som er gitt i dette datablad bygger på vår nåværende kunnskap og erfaring om produktet. All ovenstående informasjon må betraktes som retningsgivende. Det er brukerens ansvar å påse at produktet er egnet for tilsiktet anvendelse, samt utføre egenkontroll. Brukeren står ansvarlig dersom produktet blir anvendt til andre formål enn anbefalt, eller ved feil utførelse. Vi står gjerne til rådighet for veiledning i bruk av våre produkter.

Materialforbruk Consumption as waterproofing: Approx. 2.4 kg/m² 

Consumption as adhesive: 
With 4 mm notched trowel: approx. 1.7 kg/m² and per mm layer thickness. 
With 6 mm notched trowel: approx. 2.1 kg/m² 
With 8 mm notched trowel: approx. 2.4 kg/m²
Blandingsforhold A:B Comp. A: 10,0 kg. Comp. B: 1,2 kg
Påføringstemperatur +10°C to +35°C (air and substrate)
Brukstid Approx. 25 minutes
Herdetid før fuging At least 24 hours
Herdetid før gangtrafikk After 24 - 48 hours
Herdetid før full belastning After 7 days
Materiale 2-component epoxy resin
Konsistens Trowel-grade (non-sag)
Densitet App. 1,2 kg/dm³
Lagring The product can be stored dry, cool and in its original sealed packaging for at least 12 months.