Non conductive rubber hose

1. A method of making a non-conductive rubber hose comprising

blending a first composition comprising an ethylene propylene diene monomer (EPDM) polymer, wherein the EPDM polymer comprises low ethylene EPDM polymer having no more than 60 wt % ethylene by ASTM 3900 and high ethylene EPDM polymer having at least 69 wt % ethylene by ASTM 3900, in a weight ratio of about 10:1 to about 1:1, an electrically-resistive filler, and a silane-treated filler;

extruding the first composition onto a mandrel to form an EPDM rubber tube layer;

applying a textile braid over the EPDM tube layer to form reinforcement layer;

extruding a second composition over the reinforcement layer to form a cover layer in a green hose;

vulcanizing the green hose; and

expelling the hose from the mandrel.

2. The method according to claim 1 , wherein the first composition comprises a low ethylene EPDM polymer and a high ethylene EPDM polymer in a weight ratio of about 5:1 to about 2:1.

3. The method according to claim 1 , wherein the non-conductive rubber hose passes the dielectric strength test according to IEC 60974-7 (torch standard), and wherein the hose passes the insulation resistance and Hipot test to 30 kV peak for 1 minute.

4. The method according to claim 1 , wherein the second composition comprises one or more chloropolyethylene (CPE) polymers.

5. The method according to claim 4 , wherein the second composition comprises about 20-50 wt % of the one or more chloropolyethylene (CPE) polymers.

6. The method according to claim 1 , wherein the first composition further comprises a filler activator.

7. The method of claim 6 , wherein the filler activator is selected from the group consisting of a vinyl silane and a polysiloxane containing vinyl-, propyl- and ethoxy groups.

8. The method according to claim 6 , wherein the first composition comprises a weight ratio of the resistive filler to the filler activator from about 100:1 to about 5:1.

9. The method according to claim 6 , wherein the first composition further comprises an additional filler.

10. The method according to claim 9 , wherein the weight ratio of silane-treated filler to additional filler is from about 1:10 to about 10:1.

11. The method according to claim 1 , wherein the first composition further comprises each of a peroxide donor curative, a plasticizer, and an antioxidant.

12. The method according to claim 11 , wherein the first composition further comprises one or more of the group consisting of process aid, acid scavenger, paraffin wax, and zinc activator.

13. The rubber hose according to claim 1 , wherein the resistive filler is a carbon black filler having low surface area of from about 16-27 mg/g, or no more than 20 mg/g Iodine adsorption by ASTM D 1510.

14. The rubber hose according to claim 13 , wherein the resistive filler has medium to high structure of from 92-120 DBP cm3/100 g as determined by absorption of dibutylphthalate (DBP) by ASTM 2414-90.

15. The method according to claim 1 , wherein the reinforcement layer is a textile braid, wherein the textile is selected from the group consisting of aramid, rayon, nylon, cotton, and polyester braid.

16. The method according to claim 1 , wherein the first composition comprises

the EPDM polymer at 90-100 Pph;

the resistive filler at 30-60 Phr;

a filler activator at 0.1-10 Phr;

the silane-treated filler at 10-30 Phr; and

an additional filler at 20-80 Phr.

17. The method according to claim 1 , wherein the cured first composition exhibits one or more physical parameters selected from the group consisting of

Tensile strength of 2000-2500 psi when tested according to ASTM D412;

Percent elongation of 275-350% when tested according to ASTM D412;

100% Modulus of from 800-1000 psi when tested according to ASTM D412;

Shore A Hardness of from 75-80 pts when tested according to ASTM D2240; and

Minimum burst strength of 1200 psi or higher.