BORNIT^® 2C Flex Bitumen Thick Coating

status technical data sheet

25th June 2025

areas of application

BORNIT^® 2C Flex (Thick Bitumen Coating) is used for permanent, highly flexible external waterproofing of building structures in the area in contact with the ground and is applied with a trowel or spraying equipment. The product is suitable for application on horizontal and vertical surfaces.
BORNIT^® 2C Flex (Thick Bitumen Coating) can also be used for intermediate waterproofing (under screed) of floor slabs, balconies and terraces as well as for adhering insulating and drainage panels (Styrofoam^®, Styrodur^® and foam glass) to bituminous and mineral substrates in the area in contact with the ground.
BORNIT^® 2C Flex (Thick Bitumen Coating) adheres well to all dry and mineral substrates as well as bituminous substrates with sufficient stability (e.g. old cold and hot coatings or thick coatings).

type and properties

BORNIT^® 2C Flex (Thick Bitumen Coating) is a 2-component, polystyrene-filled and polymer-modified thick bitumen coating (PMBC).
The product is solvent-free and environmentally friendly. BORNIT^® 2C Flex (Thick Bitumen Coating) consists of a bitumen emulsion and a reactive powder. The chemical reaction of these components following mixing effects quick rain-fastness and an accelerated drying process. Once fully dried, it forms a solid yet highly flexible foundation coating.
The coating is highly flexible, crack-bridging and resistant to any aggressive substances occurring in natural soil.

BORNIT^® 2C Flex (Thick Bitumen Coating) is suitable for waterproofing according to DIN 18533 W1-E, W2.1-E, W3-E and W4-E.

BORNIT^® 2C Flex (Thick Bitumen Coating) complies with QNG requirements as specified in Appendix 313 of the QNG requirements catalogue.

BORNIT^® 2C Flex (Thick Bitumen Coating) has been tested in accordance with PG-FBB. The test certificate can be requested by email
(anwendungstechnik@bornit.de).

advantages

surface

Step 1: The substrate must be free from ridges or sharp-edged unevennesses as well as soil.
Step 2: Unfilled or badly filled depressions like masonry joints, mortar pockets or surface defects larger than 5 mm must be repaired with suitable mortar. With fully and flushly grouted masonry, no plaster layer is required. Voids smaller than 5 mm as well as pores in the substrate can be closed by applying a thick layer of bitumen coating in a scraping manner. Especially for concrete surfaces, application in a scraping manner is likewise recommended in order to avoid the formation of bubbles.
Step 3: It must be observed that the substrate is firm, clean, free from dust and free from separating substances. The substrate should be dry and absorbent. The surface temperature must be at least 3 Kelvin above the dew point temperature of the ambient air.
Step 4: A pre-coat with BORNIT^® Basement Primer or BORNIT^® Unibit (1:2 diluted with water) must be applied onto the substrate. For solidification of sanding substrates, priming with BORNIT^® Solidificator SB3 (diluted with clean tap water in the mixing ratio 1:1) is recommended. Upon application of the thick bitumen coating in a scraping manner, the primer must be applied in advance. A scratch coat does not replace the primer. After drying of the primer, the substrate is prepared for application of the scratch coat or the thick coating, resp.
Important: During the construction phase, thick bitumen coatings can be damaged by water affecting their rear side. In principle, it must be ensured that the coating is not damaged by water affecting the adhesive side. If necessary, water-impermeable intermediate layers of mineral waterproofing slurry (e.g. BORNIT^® Slurry SF) must be applied, which cannot be detached from the substrate by water pressure.

processing

When processing BORNIT^® 2C Flex (Thick Bitumen Coating), the current DIN 18533 must always be observed. The application of PMBC depends on the respective water exposure of the building. Therefore, it is important to ensure that the water exposure class is clearly specified by the planner before starting the workBORNIT^® 2C Flex (Thick Bitumen Coating) is ready for use after the two components are mixed to a homogeneous consistency and is applied to the prepared surface using a notched trowel, smoothing trowel, or suitable spraying equipment. It is not possible to apply the bitumen component alone without adding the reaction powder! Before use, the emulsion should first be briefly stirred with a slow-moving mechanical stirrer until it liquefies. The powder is then added in portions. Both components are mixed thoroughly with the stirrer until a homogeneous, lump-free mass is achieved (mixing time approx. 2 to 3 minutes). Components A and B are precisely matched in quantity. The working time is approximately 1.5 hours at a material temperature of +20°C. At high summer temperatures, the reaction time will be faster.

BORNIT^® 2C Flex (Thick Bitumen Coating) must not be applied during frost or when rain is imminent. Application should take place at object and ambient temperatures of no less than +5°C and no more than +30°C. The thick coating should be applied in accordance with the current DIN 18533. For waterproofing against soil moisture and non-pressing water (DIN 18533 W1-E) and splash and capillary water (DIN 18533 W4-E), the layers can be applied wet-on-wet. For waterproofing against moderate water pressure (DIN 18533 W2.1-E) and non-pressing water on earth-covered ceilings (DIN 18533 W3-E), the first waterproofing layer must dry sufficiently before applying the second layer to avoid damage. An alkali-resistant glass mesh (BORNIT^® Glass Fabric 165) must be fully embedded in the first waterproofing layer. Special attention should be paid to the correct application of the waterproofing in areas such as joints, connections, terminations, and penetrations.

The fresh coating must be protected from rain and strong sunlight! The dried waterproofing must be protected from damage and UV radiation. Protective and drainage layers should only be applied after the waterproofing layer has completely dried (weather-dependent, 1 to several days). BORNIT^® 2C Flex (Thick Bitumen Coating) can be used for bonding insulation boards. Suitable protective layers include plastic dimpled membranes with sliding foil and filter fleece, as well as thermally or bitumen-bound drainage boards. The backfilling of the excavation should be carried out promptly. DIN 18533-1, section 14, must be observed during this process.

consumption

• for the water impact classes ground moisture / non-pressing water (DIN 18533 W1-E) as well as splash and capillary water (DIN 18533 W4-E)

approx. 4.2 l/m² = wet layer thickness 4.2 mm = dry layer thickness 3.0 mm

• for the water impact classes moderately pressing water (DIN 18533 W2.1-E) and non-pressing water on ceilings covered with earth (DIN 18533 W3-E):

approx. 5.6 l/m² = wet layer thickness 5.6 mm = dry layer thickness 4.0 mm

• insulating panel adhesion:
approx. 2-3 l/m² for point adhesion
approx. 3-4 l/m² for surface adhesion

The provided consumption figures are practical experience-based values.
The consumption for the required scratch coat depends on the roughness of the substrate and must be calculated separately.
The thickness allowance according to DIN 18533-3 must be taken into account.

layer thickness control

According to the current DIN 18533, a layer thickness check in the fresh state (wet layer thickness) at the execution object as well as an inspection of the thoroughly dried state at a reference sample located in the construction pit (e.g., a brick) must be performed. For waterproofing according to DIN 18533 W2.1-E and W3-E, the results of these examinations must be documented. Water impact classes W1-E and W4-E: Minimum dry layer thickness: 3 mm Water impact classes W2.1-E and W3-E: Minimum dry layer thickness: 4 mm

product type

bituminous two-component thick coating compound

base

polystyrene-filled and polymer-modified bitumen emulsion, reactive powder

solvent

none

density at +20 °C

approx. 0.72 g/m²

PH-value

11.0 - 11.5 (liquid component)

consistency

paste-like, suitable for trowel application

colour(s)

black

application

smoothing trowel, spraying equipment

processing temperature (ambient and substrate)

not below +5 °C and not above +30 °C

processing time

at 20 °C approx. 1.5 hours

thorough hardening time

2 to several days, depending on air humidity, temperature, layer thickness and substrate

cleaning

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

storage

frost-free without fail!

shelf life

in originally sealed containers storable for 12 months

GISCODE

BBP10
ZP1

GISCODE link comp. A

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

GISCODE link comp. B

https://www.wingisonline.de/showbetrandoc.aspx?gisbaunr=4/00000012207/000009&docid=2161&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

Water impermeability

waterproof according to slit pressure test acc. to DIN 52123

Possible layer thicknesses

up to 8 mm

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

BORNIT^® 2C Flex (Thick Bitumen Coating) 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), powder component according to AVV-ASN: 170101 (concrete).

note

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.

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: Liquid component: Contains 1,2-benzisothiazol-3(2H)-one. May produce an allergic reaction.

recommended, personal protective equipment:

GISCODE

ZP1

UN-number

No dangerous good in sense of these transport regulations.

Hazard pictograms

signal word

Danger

Hazard-determining components for labelling

Cement, portland, chemicals, Flue dust, portland cement, tin sulphate

H-records

H318: Causes serious eye damage.

EUH-records

EUH208: Contains Flue dust, portland cement. May produce an allergic reaction.

P-records

P102: Keep out of reach of children.
P280: Wear protective gloves/protective clothing/eye protection/face protection/hearing protection.
P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P332 + P313: If skin irritation occurs: Get medical advice/attention.

recommended, personal protective equipment: