Corrosion-Resistant Fiberglass-Reinforced Plastic Material

1 . The use of glass reinforcing yarns of the following composition, expressed in molar percentages:

SiO 2

62-75

ZrO 2

 7-11

Na 2 O

13-23

R′O

 1-10

Al 2 O 3

0-4

B 2 O 3

0-6

Fe 2 O 3

0-5

CaF 2

0-2

TiO 2

0-4

in which:

R′O=alkaline-earth metal oxides+MnO+ZnO; and

the composition containing less than 0.1% K 2 O and/or Li 2 O to improve the resistance of plastics in contact with corrosive substances, especially bases or acids.

2 . The use as claimed in claim 1 , wherein the glass composition contains no K 2 O and Li 2 O.

3 . The use as claimed in claim 1 , wherein the glass has a working range defined by the difference between the forming temperature measured for a viscosity η equal to 10 3 poise (T logη=3 ) and the liquidus temperature (T liq ) of at least 40° C., preferably at least 100° C.

4 . The use as claimed in claim 1 , wherein the plastic is a thermoplastic or thermosetting organic material.

5 . The use as claimed in claim 4 , wherein the thermoplastic organic material is chosen from polyolefins, such as polyethylene, polypropylene and polybutylene, polyesters, such as polyethylene terephthalate and polybutylene terephthalate, polyamides, polyurethanes and blends of these compounds.

6 . The use as claimed in claim 4 , wherein the thermosetting organic material is chosen from epoxy resins, polyesters, vinyl esters, phenolic resins, polyacrylics and blends of these compounds.

7 . The use as claimed in claim 1 , wherein the glass yarn is in the form of a continuous or chopped strand, a continuous or chopped strand mat, a mesh, a veil, a woven or a knit.

8 . The use as claimed in claim 1 , wherein the glass content represents 10 to 75% by volume, preferably 20 to 60% by volume, of the composite.

9 . A composite formed from a plastic reinforced by 20 glass yams obtained as claimed in claim 1 .

10 . The composite as claimed in claim 9 , in the form of a pipe, a tank or a container, or a coating or a rebar.