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06/Dec/2019
Pinfa Workshop “Fire Safety Challenges in Automotive Plastics” in Darmstadt, Germany
Pinfa (the phosphorus, inorganic and nitrogen flam
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09/Oct/2019
Foam Expo Europe and Composite Europe 2019 in Stuttgart
Last year, the two trade fairs COMPOSITES EUROPE a
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14/Aug/2019
Pinfa Workshop “Electromobility & Fire Safety Challenges” in Tokyo, Japan
On July 1, 2019, the hotel "The Westin"
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29/May/2019
Electrified future
Also in 2019, renowned companies such as Henkel, S
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23/May/2019
Design for Fire Safety in Greener Electronics
pinfa North America held its sixth industry da
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08/May/2019
Cultural heritage in flames
The pictures of the fire of the Parisian church No
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Intumescent flame retardant systems

Mode of action: formation of a voluminous, insulating protective layer through carbonization and simultaneous foaming

Intumescent systems puff up to produce foams. They are used to protect combustible materials such as plastics or wood, and those like steel, which lose their strength when exposed to high temperatures, against the attack of heat and fire.

Basically, intumescent flame retardant systems consist of the following:
1. "Carbon" donors (e.g. polyalcohols such as starch, pentaerythritol)
2. Acid donors (e.g. ammonium polyphosphate)
3. Spumific compounds (e.g. melamine)


Process of intumescent mechanism


1. Softening of the binder/polymer (e.g. polypropylene)


2. Release of an inorganic acid (e.g. ammonium polyphosphate)


3. Carbonization (e.g. of polyalcohols)


4. Gas formation by the spumific compound (e.g. melamine)


5. Foaming of the mixture


6. Solidification through cross-linking reactions

The picture below shows how the foam looks in the end. This coating expanded from a 1 mm layer to a 100 mm foam.