BORNIT® Flexbit

bitumen | latex | coating | solvent-free | flat roof | environmentally friendly
short information
  • solvent-free, highly flexible latex coating
  • high fracture strain of 370 %
  • excellent for all roof and weldable sheetings
  • strong adhesive power - also adheres to sheet metal (aluminum, copper, etc.)
  • grit adhesive for all bitumen sheeting (including polymer)
  • for indoor and outdoor use
5 ltr. / bucket
sufficient for:
EAN code
euro pallet
approx. 10 m²
4 017228 00281 1
88 bucket
10 ltr. / bucket
sufficient for:
EAN code
euro pallet
approx. 20 m²
4 017228 00289 7
45 bucket
25 ltr. / bucket
sufficient for:
EAN code
euro pallet
approx. 50 m²
4 017228 00285 9
18 bucket
approx. 0.5 litres/m² (per coat - at least 2 coats)
storage note
  • At moderate temperatures, not below +2 °C, up to +30 °C. Sensitive to frost!
  • in originally sealed containers storable for 12 months

complementary products

Wetting tools with water before and during use considerably extends their service life!

status technical data sheet
13 August 2020

areas of application
BORNIT® Flexbit is used for maintaining aged, bituminous flat-roof coatings as well as for protecting new concrete roof surfaces (e.g., prefabricated garages) against adverse weather conditions. The product can be used on concrete, plaster, solidly filled masonry or bituminous substrates. BORNIT® Flexbit is not suitable for corrugated bituminous sheets. BORNIT® Flexbit can also be used for protecting components in contact with the ground from ground moisture (not for structural waterproofing according to DIN 18533) as well as for intermediate waterproofing under screed on horizontal surfaces, as, e.g., balconies, terraces, basement floors and tiling. BORNIT® Flexbit is suitable for polymer-bitumen sheeting and also serves as an adhesive (for gravel surfacing) for fastening spread out slate chippings or other suitable mineral spreading materials on roofs with a pitch of up to 25 %. By applying a new layer of chippings on weathered, bituminous roofing membranes, a higher resistance against weather impacts and an attractive appearance are achieved.

type and properties
BORNIT® Flexbit is a high-quality, rubber-latex-modified bitumen emulsion for seamless, resilient and waterproof protective coatings for most different areas of application in building construction and civil engineering. In its hardened state, the coating is weather- and UV-resistant and may be used inside as well as outside. The product is solvent-free and, following thorough drying, forms a highly elastic, crack-bridging protective coating against water and moisture.

  • highly elastic and crack-bridging
  • universally applicable and manufactured ready for use
  • high fracture strain of 370 %
  • solvent-free, hence environmentally friendly
  • also suitable for polymer-bitumen sheeting

The substrate must be firm, stable, clean and free from any separating substances (oil, grease, dust, etc.). It may be slightly moist, but not wet. Standing water must be removed. For use on flat roofs, there must be a sufficient roof pitch (at least 3°).

BORNIT® Flexbit is manufactured ready for processing – it might have to be stirred up briefly. Apply with a previously moistened polyamide-yarn paint roller, broom, small or large brush or suitable spraying equipment (airless). In case of highly absorbent and sanding substrates, prime with BORNIT® Grundbit. Coating is undertaken with undiluted BORNIT® Flexbit in at least 2 layers. The second coat is applied following drying of the previous one. BORNIT® Glass Fabric 58 embedded into the coating increases stability against mechanical stress. Following thorough drying, BORNIT® Flexbit is waterproof and weather-resistant. BORNIT® Flexbit must never be applied in case of rain, too high air humidity (mist) or frost (sensitive to frost!). During processing, the substrate and ambient temperatures must not undercut +5 °C and should not exceed +30 °C. Clean work equipment with water immediately after use. Protect the fresh coating from rain. Until complete and thorough hardening, protect BORNIT® Flexbit from frost.
Upon spreading out slate chippings, these must be spread out in a generous layer and rolled-in. Remove excess material only after complete setting. Consumption amounts to approx. 2-4 kg of slate chippings.

approx. 0.5 litres/m² (per coat - at least 2 coats)

product data in brief
product type
protective bitumen-latex coating
rubber-latex, bitumen emulsion
density at +20 °C
approx. 1.00 g/cm³
11.0 - 11.5
viscous, thixotropic
small or large brush or special spraying equipment (airless)
processing temperature (ambient and substrate)
from +5 °C to max. +30 °C
in the fresh state with water, in the hardened state with BORNIT® MultiClean Spray, BORNIT® MultiClean or BORNIT® Bitumen Cleaner
At moderate temperatures, not below +2 °C, up to +30 °C. Sensitive to frost!
shelf life
in originally sealed containers storable for 12 months
GISCODE link comp. A
substances hazardous to health in terms of the ordinance on hazardous materials
hazard class according to ADR
boiling start and Boiling range
+100 °C
fracture strain
370 %

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.

In originally sealed containers storable for 12 months. Protect from frost!

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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Kein Gefahrgut im Sinne der Transportvorschriften.

Hazard-determining components for labelling

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

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