BORNIT^® Flexbit

status technical data sheet

11th June 2026

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 (roof pitch of at least 3%). 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 free from organic solvents (solvent-free) and, following thorough drying, forms a highly elastic, crack-bridging protective coating against water and moisture.

BORNIT^® Flexbit meets the requirements (Annex 313 / Items 10.1 and 10.2 – Bitumen-based building products) of the state quality label for sustainable buildings (Quality Label for Sustainable Buildings (QNG)). The label is issued by the German Federal Ministry for Housing, Urban Development and Construction.

Advantages

Surface

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%).

Processing

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/m² of slate chippings.

Consumption

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

Product type

protective bitumen-latex coating

Base

rubber-latex, bitumen emulsion

Solvent

none

Density at +20 °C

approx. 0.96 g/cm³

PH-value

11.0 - 11.5

Consistency

viscous, thixotropic

colour(s)

black

Dilution

water

Application

small or large brush or special spraying equipment (airless)

Processing temperature (ambient and substrate)

from +5 °C to max. +30 °C

Cleaning

in the fresh state with water, in the hardened state with BORNIT^® MultiClean Spray, BORNIT^® MultiClean or BORNIT^® Bitumen Cleaner

storage

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

BBP10

GISCODE link comp. A

https://www.wingisonline.de/showbetrandoc.aspx?gisbaunr=4/00000018210/000009&docid=1995&lang=de

Substances hazardous to health in terms of the ordinance on hazardous materials

none

Hazard class according to ADR

none

Boiling start and Boiling range

+100 °C

fracture strain

3,7

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.

Storage

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).

Note

The information set out above supersedes all previous technical information relating to the product. The previous information is therefore no longer valid. The details have been compiled in accordance with the latest state of the art in application technology. Please note, however, that depending on the condition of the building, it may be necessary to deviate from the working method recommended in this data sheet. Unless otherwise agreed in an individual contract, all information contained in this data sheet is non-binding and therefore does not constitute an agreed product specification. We reserve the right to make changes to the information contained in this data sheet at any time.

The product illustrations are to be understood as examples. No legally binding claim can be derived from them. We reserve the right to make changes to the product’s appearance.

Our packaging complies with the relevant legal requirements and with Regulation (EU) 2025/40 on packaging and packaging waste (PPWR). The technical documentation in accordance with Annex VII is available and can be provided on request by email to info@bornit.de.

GISCODE

BBP10

UN-number

No dangerous good in sense of these transport regulations.

Hazard-determining components for labelling

1,2-Benzisothiazol-3(2H)-on

EUH-records

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

Recommended, personal protective equipment: