WELA Handelsgesellschaft mbH

Flammstop resin systems

Halogen-free WELA fire protection with reactive and non-reactive fillers for epoxy resin high-performance composites.
WELA fire protection solutions turn your high-performance compositions from epoxy or vinyl ester resins into flame-retardant composite materials.

Halogen-free, flame-retardant, self-extinguishing, non-dripping, low smoke gas content, low toxicity

The WELA Flammstop system was principally developed for use in rail vehicles on public transport networks. Other applications are being developed. It fulfils various national and international fire protection standards while maintaining the stipulated processing technologies. Nationally tested in accordance with DIN 54837 (draft 01.91) observing the “Principles for testing and classifying the fire behaviour of materials and components in rail vehicles in accordance with DIN 5510, Part 2” (draft 06.01). The requirements for S 4, SR 2 and ST 2 are fulfilled with sufficient safety for various fibre composite systems with WELA Flammstop. The Flammstop system was tested in the NBS smoke density chamber in accordance with ASTM 662, and the demand for low-toxicity smoke gases was met. The demands of Airbus Industries regarding smoke density as defined by FAR Part 25.853 (d) and ABD 0031 as well as toxicity as defined by ABD 0031 were met.

Following application and gelling-on of the WELA Flammstop EP gelcoat work can continue without a solid flame protection agent, e.g. with the RTM methods. Processing with commercial common EP prepregs is also possible. To achieve greater flame protection efficiency with material characteristic values, reactive liquid flame protection agents can be used. Good bonding of the epoxy resin on the EP gelcoat has been proven in tests.

WELA Gelcoat 547 (brushable)
Type Resin/hardener Mixing ratio
WELA Gelcoat 547: WELA 28
Pack sizes  
Minimum order size: Upon request
WELA Gelcoat 547 Resin   30 kg, 200 kg Branche Schienenfahrzeuge Branche Windenergie Branche Bootsbau Branche Automotive
WELA 28 Hardener 100 : 14,3 10 kg, 25 kg Branche Schienenfahrzeuge Branche Windenergie Branche Bootsbau Branche Automotive

Legend:

  • Branche Flugzeugbau Aircraft construction
  • Branche Schienenfahrzeuge Rail vehicles
  • Branche Windenergie Wind power
  • Branche Bootsbau Boat building
  • Branche Automotive Automotive
WELA Gelcoat 784 (sprayable)
Type Resin/hardener Mixing ratio
WELA Gelcoat 784: WELA 183
Pack sizes  
Minimum order size: Upon request
WELA Gelcoat 784 Resin   30 kg, 200 kg Branche Schienenfahrzeuge Branche Windenergie Branche Bootsbau Branche Automotive
WELA hardener 183 Hardener 100 : 32,3 10 kg, 25 kg Branche Schienenfahrzeuge Branche Windenergie Branche Bootsbau Branche Automotive

Legend:

  • Branche Flugzeugbau Aircraft construction
  • Branche Schienenfahrzeuge Rail vehicles
  • Branche Windenergie Wind power
  • Branche Bootsbau Boat building
  • Branche Automotive Automotive

Properties of the WELA-Flammstop system

The formulated EP/EH system displays little shrinkage. The high portion of filling material consisting of flame protection additives reduces shrinkage even further. This almost eliminates the tendency toward stress cracking.
The WELA EP Gelcoat does not split off any low-molecular reaction products. This means that the micro-porosity is very low in the gelcoat layer. The density of the EP Gelcoat is 1.42 g/cm³.

EP wet laminates

Flammstop EP-NasslaminateCan be brushed on with WELA Flammstop 547/28 or sprayed with WELA Flammstop SG 1/SH 2.
With S4, SR 2 and ST 2 approval, tested in accordance with DIN 54837 (E 1/1991), classified in accordance with DIN 5510, Part 2.
Fulfils the requirements of Airbus Industries in accordance with ABD 0031 and the regulations for smoke density and toxicity in accordance with FAR 25.853 (d) and ABD 0031.

EP sandwich laminates with WELA-Flammstop 784/183

Flammstop EP-SandwichlaminateWith S4, SR 2 and ST 2 approval, tested in accordance with DIN 54837 (E1/1991), classified in accordance with DIN 5510, Part 2, fulfils the requirements of Airbus Industries in accordance with ABD 0031 and the regulations for smoke density and toxicity in accordance with FAR 25.853 (d) and ABD 0031.

zurück zur Produktübersicht