Placi din amestecuri de fibre non-azbest

Asbestos-free fibre mixture gasket sheets (AF)

Compressed fibre materials are based upon production techniques initially used for compressed asbestos fibres, the so called IT techniques (gumI asbesT). After the banning of asbestos, there has been no direct equivalent due to its unique chemical properties. Compressed fibre materials can be an alternative to the solution, but the range of use is much smaller than that of the asbestos and is much more dependent on the fibre mixture used during manufacturing.

Asbestos-free sealing plates are bonded during manufacturing by using elastomers. This provides more safety when cutting, and flexibility for handling and assemblage. During its usage, especially with temperatures above 100 C, the elastomer will bind. Even though this does not necessarily affect the integrity of the gasket at its place, it can affect its ability to offer a reliable performance regarding temperature and pressure. Usually, good quality gaskets contain a small quantity of binder. Nowadays, aramide, carbon, glass fibres are being used in order to replace the asbestos ones, and for the growth of density – mineral fibres.

Standard size 1500 mm x 1500 mm; 1500 mm x 3000 mm.

Standard thickness: 0,5 mm; 0,8 mm; 1 mm; 1,5 mm; 2 mm; 2,5 mm; 3 mm; 4 mm; 5 mm; 6 mm.

Upon client request, the plates can be reinforced or graphited on both sides (AF 302 – ZS, AF 302 – 2G, respectively AF 302 – ZS – 2G).

Main types of asbestos-free sealing sheets:

Name

AF-302

AF 302 ZS

AF-200 UNIVERSAL

AF-200 Universal ZS

AF-Oil

AF-Oil ZS

Grafex Carb

Composition

Mineral fibres + Natural fibres+ NBR

Mineral fibres + Aramid fibres  + NBR

Aramid fibres  + Mineral fibres + NBR

Carbon fibres + NBR

Sheet type

No insertion

Wire mesh insertion

No insertion

Wire mesh insertion

No insertion

Wire mesh insertion

No Insertion

Pmax

(bar)

30

40

60

80

100

120

100

Tmax

(0 C)

180

230

300

350

350

380

450

Tmax continuous

(0 C)

150

200

220

270

300

350

250

Tmax steam

(0 C)

130

130

180

180

230

230

200

Working fluids

Water, steam, oil, solvents, etc

Water, steam, oil, solvents, etc

Water, steam, oil, solvents, weak acid or base solutions etc

Water, steam, oil, solvents, weak acid or base solutions, etc

Water, steam, oil, solvents, weak acid or base solutions, etc

Water, steam, oil, solvents, weak acid or base solution, etc

Water, steam, oil, solvents, acid or base solution, etc