Fire retardant compositions and cable separators formed thereof
A fire retardant composition is disclosed. The composition includes polyvinyl chloride, a plasticizer, a brominated fire retardant additive, a fire retardant synergist, and a metal stabilizer. Cable separators formed of the fire retardant composition are also disclosed.
1. A fire retardant composition comprising:
polyvinyl chloride;
about 10 parts to about 40 parts, by weight, of a plasticizer comprising one or more of a trimellitate ester and a phosphate ester;
about 0.1 part to about 25 parts, by weight, of a brominated fire retardant additive;
about 25 parts to about 75 parts, by weight, of a fire retardant synergist comprising a metal hydroxide;
about 1 part to about 10 parts, by weight, of a mixed metal stabilizer; and
wherein the fire retardant composition is substantially free of a halogenated plasticizer.
2. The fire retardant composition of claim 1 , wherein the trimellitate ester comprises one or more of tris-(octyl, decyl)-trimellitate, tri (heptyl, nonyl) trimellitate, and linear trinonyltrimellitate.
3. The fire retardant composition of claim 1 , wherein the phosphate ester comprises phosphoric acid dodecyl ester diphenyl ester.
4. The fire retardant composition of claim 1 , wherein the plasticizer further comprises a phthalate plasticizer comprising diundecyl phthalate.
5. The fire retardant composition of claim 1 , wherein the brominated fire retardant additive comprises ethylene bis(tetrabromo phthalimide).
6. The fire retardant composition of claim 1 , further comprising about 0.1 part to about 25 parts, by weight, of a second fire retardant additive comprising one or more of antimony trioxide and zinc hydroxystannate.
7. The fire-retardant composition of claim 1 , wherein the fire retardant synergist comprises aluminum hydroxide.
8. The fire-retardant composition of claim 1 , wherein the mixed metal stabilizer comprises calcium-zinc metal carboxylate.
9. The fire retardant composition of claim 1 , further comprising about 0.1 part to about 1 part of a lubricant.
10. The fire retardant composition of claim 1 , further comprising about 40 parts or less of a smoke suppressant.
11. The fire retardant composition of claim 10 , wherein the smoke suppressant comprises ammonium octamolybdate.
12. The fire retardant composition of claim 1 has a limiting oxygen index of about 50% or greater.
13. The fire retardant composition of claim 1 has a dielectric constant of about 3.4 or less when measured at about 10 MHz.
14. The fire retardant composition of claim 1 has a dissipation factor of about 0.020 or less when measured at about 10 MHz.
15. The fire retardant composition of claim 1 is foamed and has a foam rate of about 30% or less.
16. A cable comprising a cable separator formed of the fire retardant composition of claim 1 .
17. The cable of claim 16 passes the requirements of National Fire Protection Association (“NFPA”) standard 262.
18. A fire retardant composition comprising:
polyvinyl chloride;
about 10 parts to about 40 parts, by weight, of a plasticizer comprising one or more of a trimellitate ester and a phosphate ester;
about 0.1 part to about 25 parts, by weight, of a brominated fire retardant additive;
about 0.1 to about 25 parts, by weight, of a second fire retardant additive comprising antimony trioxide about 25 parts to about 75 parts, by weight, of a fire retardant synergist comprising a metal hydroxide;
about 1 part to about 10 parts, by weight, of a mixed metal stabilizer; and
wherein the fire retardant composition is substantially free of a halogenated plasticizer.