BORNIT® Grundbit

bitumen | polymer | primer | base coat | solvent-free | interior
short information
  • environmentally friendly because solvent-free
  • outstanding bond strength (on metal)
  • frictional adhesion
  • economical use
  • reclosable packaging
5 ltr. / bucket
sufficient for:
EAN code
euro pallet
approx. 25 m²
4 017228 00292 7
60 bucket
10 ltr. / bucket
sufficient for:
EAN code
euro pallet
approx. 50 m²
4 017228 00293 4
44 bucket
25 ltr. / bucket
sufficient for:
EAN code
euro pallet
approx. 125 m²
4 017228 00294 1
18 bucket
approx. 0.2 l/m² (depending on the absorbency of the substrate)
storage note
  • not tempered below +2 °C to max. +30 °C
  • sensitive to frost!
  • in originally sealed containers storable for 12 months


Wetting tools with water before and during use considerably extends their service life! Stir briefly before application.

status technical data sheet
09 November 2020

areas of application
BORNIT® Grundbit is used as a bonding agent for priming substrates prior to applying welded sheets or as primer for subsequent bitumen emulsion coatings (e.g. BORNIT® Flexbit, BORNIT® Unibit or BORNIT® Dachbit). The product can be used indoors and outdoors on substrates common in construction which are bitumen- compatible (e.g. concrete, masonry, plaster, metal or old bitumen sheets).
BORNIT® Grundbit corresponds to the requirements according to the “Flat roof guidelines” of ZVDH and the “Technical rules ABC for bitumen sheeting” of vdd.
Note: According to a circular of Bau-BG (building trade association) (11/05), using emulsion-based bitumen primers (BORNIT® Grundbit) is expressly recommended for work in interior spaces!

type and properties
BORNIT® Grundbit is a polymer modified bitumen primer with excellent adhesive properties on substrates common in construction.

The product is environmentally friendly, since it does not contain any solvents.

BORNIT® Grundbit is QNG-compliant in accordance with QNG requirements catalogue appendix document 313.

  • solvent-free, hence environmentally friendly
  • excellent adhesive strength (also on metal)
  • strong adhesion
  • economical consumption
  • resealable containers

The surface must be clean and free from oil and grease. Loose particles are removed, damaged areas, cracks and holes should be repaired before. The surface may be slightly damp, but not wet.
Observe when use on metal surfaces necessarily: The surface must be clean, dry and oil- and grease-free. If necessary degrease and roughen the metal.

BORNIT® Grundbit is processed cold. Stir briefly before application.
The primer can be applied to the substrate by brushing it on, rolling it on or spraying it on. It is recommended to moisten the tool slightly prior to and during processing.
The product must not be processed at ambient and object temperatures below +5 °C and above +30 °C. BORNIT® Grundbit must never be applied in case of rain, too high air humidity (mist) or frost (sensitive to frost!). Until complete drying, the coating must be protected from rain and frost.
Clean the tools with water immediately after use.
Prior to applying the welded sheeting, make sure that BORNIT® Grundbit is completely and thoroughly dry.
The drying time depends on the weather, the ambient and substrate temperatures as well as the absorbency of the substrate. At +20 °C, it is approx. 2 hours.
On metal substrates, the drying time can be prolonged, depending on the weather.

approx. 0.2 l/m² (depending on the absorbency of the substrate)

product data in brief
product type
bitumen emulsion
elastomers, bitumen, additives
density at +20 °C
approx. 1.00 g/cm³
11.0 - 11.5
thin liquid
fresh brown, dried black
pressure sprayers, spraying equipment, wide brush, roller
processing temperature (ambient and substrate)
+5 °C up to +30 °C
in the fresh state with water, in the hardened state with BORNIT® MultiClean Spray, BORNIT® MultiClean or BORNIT® Bitumen Cleaner
not tempered below +2 °C to max. +30 °C sensitive to frost!
shelf life
in originally sealed containers storable for 12 months
GISCODE link comp. A
hazard class according to ADR
health and fire protection, occupational safety
To ensure safe handling of the product, the physical, safety, toxicological and ecological information provided online, the information in the current safety data sheet and the additional information on the label must be read and followed before purchasing or using the product! The applicable regulations, ordinances and laws must be complied with.

In case of doubt, please contact the BORNIT® application technology department or the BORNIT® service hotline on +49 375 2795 123.

BORNIT® Grundbit must be protected from frost! Heat exposure above +30 °C and direct solar irradiation must be avoided. Shelf life in the originally sealed container 12 months.

disposal note
Only recycle completely empty containers. Material residues can be disposed of according to AVV-ASN: 080410 (adhesive and sealing compound residues, except for those falling under 080409).

The above information replaces all previous technical information about the product. Thus, this information is no longer valid. The details have been compiled according to the latest state of application technology. Please observe, however, that, depending on the state of the construction object, deviations from the method of application suggested in the datasheet may be required. Unless agreed otherwise in individual contracts, any information contained in the datasheet shall be non-binding and thus does not represent an agreed product constitution. We reserve the right to any changes in the information contained in this datasheet anytime.
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No dangerous good in sense of these transport regulations.

Hazard-determining components for labelling

EUH208: Contains 1,2-Benzisothiazol-3(2H)-on. May produce an allergic reaction.

recommended, personal protective equipment: