5. Bitumen-APP waterproofing coatings
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Composition
APP is atactic polypropylene. It is a by-product of the manufacture of conventional polypropylene (which is a crystalline form of PP). Its use was developed in Italy.
As with SBS, the addition of APP to bitumen increases (but to a lesser extent) the bitumen's flexibility at high and low temperatures. It also improves waterproofing and UV resistance. Above all, the addition of 15-30% APP to bitumen raises the softening point to 145-150°C, thus preventing hot creep and slippage on slightly sloping roofs (figure 9 and table 13 ).
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Bitumen-APP waterproofing coatings
Standards
- Roches, poudres et fines d'asphalte naturel - NF B 13-001 - Décembre 1977
- Mastic asphalt for waterproofing – Definitions, specifications and test methods - NF EN 12970 - Décembre 2000
- Bitumes et liants bitumineux. Détermination de la pénétrabilité à l'aiguille - NF EN 1426 - Décembre 1999
- Bitumen and bituminous binders and binders – Determining the softening temperature – Ball-and-ring method - NF EN 1427...
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