Oil field mats

Claim 2

A protective mat comprising an oil-resistant elastomer with d.c. proof test voltage in excess of 70,000 volts comprising the formulation of 1503 type rubber, a cold polymerized styrene butadiene with a fatty acid emulsifier formed by acid coagulation, 23.5% target bound styrene, with a nominal Mooney viscosity of 52 (ML 1+4) 212° F. and is non staining (80 parts); CIS-4-1203, a solution butadiene dry rubber with CIS content of 93% and having a nominal Mooney viscosity (ML 1+4, 100° C.) of 45 (20 parts); Ca CO3 (25 parts); Mineral Rubber (50 parts); Zinc Oxide (10 parts); Stearic acid (1 part); Octamine (1 part); Sunproof wax (2 parts); PbO (2 parts); 90% of the zinc salt of 2-mercapto-benzo thiazole and 10% hydrocarbon wax (21/2 parts); tetramethyl thiuram monosulphide (2.3 parts); and Sulfur (1.8 parts); which material provides a scorch test of 9.5 minutes at 280° F. and has a Shore A hardness of 56.

Claim 3

A protective mat comprising a first layer composed of an oil-resistant elastomer with proof test voltage in excess of 70,000 volts in combination with a second, oil-resistant elastomer layer of greater mechanical strength than and of lesser insulating capacity at high voltage than said first layer, said second elastomer layer firmly attached to the top of said first layer, and wherein said first layer comprises a composition composed of 1503 type rubber, a cold polymerized styrene butadiene with a fatty acid emulsifier formed by acid coagulation, 23.5% target bound styrene, with a nominal Mooney viscosity of 52 (ML 1+4) 212 degrees F. and is non staining (80 parts); CIS-4-1203, a solution butadiene dry rubber with CIS content of 93% and having a nominal Mooney viscosity (ML 1+4, 100 degrees C.) of 45 (20 parts); CA CO3 (25 parts); Mineral Rubber (50 parts); Zinc Oxide (10 parts); Stearic acid (1 part); Octamine (1 part); Sunproof wax (2 parts); PbO (2 parts); 90% of the zinc salt of 2-mercapto-benzo thiazole and 10% hydrocarbon wax (21/2 parts); tetramethyl thiuram monosulphide (2.3 parts); and Sulfur (1.8 parts); which material is compounded to provide a scorch test of 9.5 min. at 280 degrees F. and has a Shore A hardness of 56; and said second layer comprises a composition composed of polychloroprene with Mooney viscosity (ML 1+2.5, 212 F.) 50, (100 parts); carbon black, particle size average mu, 19, surface area average m 2 /gm 140, DBP 113, (30 parts); Stearic Acid, (1 part); Zinc Oxide, (5 parts); Magnesium Oxide, (4 parts); Phenyl-beta- naphthyl amine, (2 parts); a napthenic oil ASTM D 2226 Type 103, sp. gr. 0.9194, aromatic 42.9%, liq. visc. 156 SUS at 100° F. Flash pt. 330° F. VGC 0.878 aniline pt. 156° F., (4 parts); Coumarone indene resin, (4 parts); Petrolatum, (2 parts); Tetra methylthiuram monosulfide, (0.6 parts); Diphenyl-guanidine, (0.6 parts); and Sulfur, (1 part); which material provides a Scorch test (at 250° F. (121° C.)+5), 30.0; Shore A Hardness 66; and Specific Gravity 1.34.

Claim 4

A protective mat comprising a first layer composed of an oil-resistant elastomer with proof test voltage in excess of 70,000 volts in combination with a second, oil-resistant elastomer layer of greater mechanical strength than and of lesser insulating capacity at high voltage than said first layer, said second elastomer layer firmly attached to the top of said first layer, and wherein said first layer comprises a composition composed of 1503 type rubber, a cold polymerized styrene butadiene with a fatty acid emulsifier formed by acid coagulation, 23.5% target bound styrene, with a nominal Mooney viscosity of 52 (ML 1+4) 212 degrees F. and is non staining (80 parts); CIS-4-1203, a solution butadiene dry rubber with CIS content of 93% and having a nominal Mooney viscosity (ML 1+4, 100 degrees C.) of 45 (20 parts); CA CO3 (25 parts); Mineral Rubber (50 parts); Zinc Oxide (10 parts); Stearic acid (1 part); Octamine (1 part); Sunproof wax (2 parts); PbO (2 parts); 90% of the zinc salt of 2-mercapto-benzo thiazole and 10% hydrocarbon wax (21/2 parts); tetramethyl thiuram monosulphide (2.3 parts); and Sulfur (1.8 parts); which material is compounded to provide a scorch test of 9.5 min. at 280 degrees F. and has a Shore A hardness of 56; and said second layer comprises a composition composed of polychloroprene with Mooney viscosity (ML 1+2.5, 212 F.) 50, (100 parts); carbon black, particle size average mu, 19, surface area average m 2 /gm 140, DBP 113, (30 parts); Stearic Acid, (1 part); Zinc Oxide, (5 parts); Magnesium Oxide, (4 parts); Phenyl-beta- naphthyl amine, (2 parts); a napthenic oil ASTM D 2226 Type 103, sp. gr. 0.9194, aromatic 42.9%, liq. visc. 156 SUS at 100° F. Flash pt. 330° F. VGC 0.878 aniline pt. 156° F., (4 parts); Coumarone indene resin, (4 parts); Petrolatum, (2 parts); Tetra methylthiuram monosulfide, (0.6 parts); Diphenyl-guanidine, (0.6 parts); and Sulfur, (1 part); which material provides a Scorch test (at 250° F. (121° C.)+5), 30.0; Shore A Hardness 66; and Specific Gravity 1.34.

Claim 5

A mat as in claim 2 comprising also an electrically conductive metallic mesh between and attached to said first and second layers.

Claim 6

A mat as in claim 2 comprising a third, oil-resistant, elastomer layer below and attached to the bottom of said first layer, said third layer having a greater mechanical strength than said first layer.

Claim 7

A mat as in claim 4 wherein said third layer is an electrically conductive elastomer.

Claim 8

A mat as in claim 4 with an electrically conductive metallic mesh between said first and second layers and a separate electrically conductive mesh between said first and third layers.

Claim 9

A mat as in claim 2 comprising a third oil-resistant elastomer layer above and attached to the top of said second layer, said third layer having a dielectric strength at high voltage greater than the elastomer of the second layer.

Claim 10

A mat as in claim 7 comprising a conductive metallic mesh between said first layer and said second layer and a separate conductive metallic mesh between said third layer and said second layer.