OTTOSEAL A 250_Dachdecker- und Spengler-Acryl_310 ml -Kartusche_Teaserbild


The roofers’ and tinsmiths’ acrylic

1-component acrylate copolymer plastic sealant
For indoor and outdoor application
  • Immediately rainproof
  • Compatible with bitumen
  • Also adheres to moist substrates
  • Weather and UV resistant
Technical datasheet

Product details

The roofers’ and tinsmiths’ acrylic OTTOSEAL® A 250 is ideal for sealing any joints and seams in the roof area as well as the edge sealing on chimneys. The sealant is immediately rainproof, compatible with bitumen and also adheres to moist substrates. In addition, it forms a barrier between building materials containing bitumen and adjacent sealants (e.g. of silicone).

Fields of application

  • Perfect sealing for roofers and plumbers
  • Sealing of air condition and ventilation systems
  • Sealing of joints and seams on the roof, including on damp substrates
  • Edge sealing of chimneys, metal profiles and parapet covers
  • Sealing of bitumen coats on masonry, concrete, etc.
  • Adhesion and joining of corrugated roofing tiles made from fibre cement, metal, PVC, polyester and bitumen (depending on the expected loads, e.g. wind suction, an additional mechanical attachment may be required)
  • Barrier of building materials containing bitumen for the subsequent silicone sealant


  • Immediately rainproof
  • Processable even in rain
  • Compatible with bitumen
  • Does not cause any incompatibilities
  • Very good adhesion on many materials
  • No pre-treatment required
  • Also bonding to damp surfaces
  • No lost working time due to drying of the substrates
  • Compatible with coatings according to DIN 52452
  • No interaction with existing and adjacent coatings
  • Can be painted and varnished – please observe application instruction in Technical Data Sheet
  • Optical adaptation and protective coating possible
  • Good UV-resistance
  • Long durability in exposed areas

Standards and tests

  • Suitable for applications according to IVD instruction sheet no. 12+31+35 (IVD = German industry association sealants)

Colours & form of delivery

310 ml cartridge
crystal clear
Units per packaging unit 20
Pieces per pallet 1200

Due to typographical reasons the colours shown below may differ from the original colours of the products.

Products, packaging Units and/or colours bearing order codes are available ex warehouse in standard commercial quantities.

Consumption calculator

Please note: This values are approximate and serve as a rough guide for rightangled joints. The depth of the joints is measured to the rear of the profile. Depending on the processing method, additional expenditure of up to 25% is possible.

Do you have questions about our OTTOSEAL® sealants?

Our application consultation is available Monday to Thursday from 8:00 a.m. to 4:00 p.m. and Friday from 8:00 a.m. to 2:00 p.m. and will be happy to receive your request.