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1. WO2010079348 - FLAME RETARDANT MATERIAL AND A CABLE HAVING A CABLE SHEATH COMPOSED OF THE SAME

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CLAIMS

1. A flame retardant material comprising :

- a polymer; and

- at least two high purity, fine precipitated A1(OH)3 flame retardant fillers, one having, in isolation, a specific surface area of at least 130% that of another.

2. A flame retardant material comprising :

- a polymer; and

- at least two high purity, fine precipitated A1(OH)3 flame retardant fillers, characterised by a first AL(OH)3 filler having, in isolation, a specific surface area of 4 to 8 m2/g and a second AL(OH)3 filler having, in isolation, a specific surface area of 8 to 14 m2/g.

3. A material according to claim 2 wherein the first AL(OH)3 filler has, in isolation, a specific surface area of 6 to 8 m2/g.

4. A material according to claim 2 or claim 3 wherein the second AL(OH)3 filler has, in isolation, a specific surface area of 10 to 12 m2/g.

5. A material according to any preceding claim wherein the second AL(OH)3 filler has, in isolation, a specific surface area of at least 150% that of the first AL(OH)3 filler.

6. A material according to any preceding claim wherein the first AL(OH)3 filler is subjected to a vinyl-silane treatment and wherein the second AL(OH)3 filler is not so subjected.

7. A material according to any preceding claim wherein the ratio of the first to second filler is between 1 : 1.27 and 1 : 1.67.

8. A material according to claim 7 wherein the ratio of the first to second filler is between 1 :1.37 and 1 :1.57.

9. A material according to claim 7 wherein the ratio of the first to second filler is 1 : 1.47.

10. A material according to any of the preceding claims wherein the combined content of the first and second fillers in the material is between 50% and 70%.

11. A material according to claim 10 wherein the combined content of the first and second fillers in the material is between 55% and 65%.

12. A material according to claim 10 wherein the combined content of the first and second fillers in the material is 60%.

13. A material according to any of the preceding claims wherein the first filler is Martinal 107A.

14. A material according to any of the preceding claims wherein the second filler is Martinal 11 ILE.

15. A material according to any preceding claim wherein the polymer is a low density polyethylene co-polymer or a blend thereof.

16. A cable having a cable sheath composed of material according to any of the preceding claims.