Friction lining

1. A clutch friction lining, comprising:

at least one layer containing at least hollow glass spheres,

wherein the hollow glass spheres consist of borosilicate glass,

wherein the hollow glass spheres account for an amount by weight of 2 to 15% of the weight of the friction lining,

wherein the hollow glass spheres have a diameter of less than 300 micrometers, and

wherein the wall thickness of the hollow glass spheres is between 5 and 50% of a sphere radius.

2. The friction lining of claim 1 , wherein the hollow glass spheres have an isostatic pressure stability of more than 10 MPa.

3. The friction lining of claim 2 , wherein the hollow glass spheres have a Mohs hardness of less than 5.

4. The friction lining of claim 2 , wherein the hollow glass spheres have a Mohs hardness of 3 to 4.

5. The friction lining of claim 3 , wherein the hollow glass spheres have a density of 0.6 to 0.8 g/cm 3 .

6. The friction lining of claim 3 , wherein the hollow glass spheres have a density of 0.7 g/cm 3 .

7. The friction lining of claim 5 , wherein the hollow glass spheres have a melting point of between 500° C. and 700° C.

8. The friction lining of claim 5 , wherein the hollow glass spheres have a melting point of 600° C.

9. The friction lining of claim 7 , wherein the hollow glass spheres consist of 50 to 80% by weight SiO 2 , less than 20% by weight Al 2 O 3 , less than 5% by weight Fe 2 O 3 , TiO 2 , K 2 O and CaO, 2 to 20% by weight B 2 O 3 and 20 to 40% by weight Na 2 O.

10. The friction lining of claim 7 , wherein the hollow glass spheres consist of 60 to 70% by weight SiO 2 , less than 5% by weight Al 2 O 3 , less than 1% by weight Fe 2 O 3 , TiO 2 , K 2 O and CaO, 2 to 10% by weight B 2 O 3 and 20 to 35% by weight Na 2 O.

11. The friction lining of claim 1 , wherein at least one friction lining carrier means is embedded in the friction lining.

12. The friction lining of claim 1 , wherein the friction lining is firmly bonded to at least one friction lining carrier means,

13. The friction lining of claim 1 , wherein the friction lining consists of 10-40% by weight resin, 5-20% by weight rubber, 0.5-3% by weight vulcanization additives, 8-20% by weight glass, 10-30% by weight baryte, 5-15% by weight carbon black, 0-10% by weight coke, 0-5% by weight graphite and 5-15% by weight metal, where the glass consists of glass fibers and/or ground glass and 2-15% by weight hollow glass spheres.

14. The friction lining of claim 1 , wherein the wall thickness of the hollow glass spheres is 10% of a sphere radius.