mineral black

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Related to mineral black: Mineral blue

mineral black

[′min·rəl ¦blak]

(materials)

Black pigment made from ground slate, shale, coke, coal, or slaty coal; used in inks, plastics, and coatings.

mineral black, slate black

Black pigment obtained from crushing and grinding black earth deposits, such as slate, coal, coke, or shale.

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Sorbitan mono- stearate NF 1 1 1 1 Mineral black 25 -- -- -- N-990 -- 30 -- -- N-762 -- -- 20 -- N-550 -- -- -- 20 Tensile, psi 1,800 2,600 2,900 3,100 Elongation, % 260 250 250 240 Hardness, type A 73 74 72 75

Ca [(OH).sub.2], MgO) (1-5 PHR) * Improve compression set - Mineral black; higher peroxide/ coagent levels; cure activator (i.e.

A unique type of fluorocarbon elastomer

Table : Table 1 - chemical and physical properties of mineral black 325BA Specific gravity, raw material 1.22 325 Mesh, wet screen, % through 99.9% 500 Mesh, wet screen, % through 99.5% Average particle diameter 5-6 [micro] m Moisture 1.0% Max Volatile matter 17.0-18.0% Fixed carbon 75.00% Ash 6.0-7.0% Total sulfur .60-1.20% Free sulfur <.05% Oil absorption 50# Oil/100# 325BA pH 7.0

Several practical compounds utilizing common polymers have been chosen to illustrate the application of mineral black in actual recipes.

Table : Table 4 - test results-tread base compound using mineral black 325BA to lower pound-volume costs and decrease hysteresis Recipe Control B C 100%- 70%- 50%- N-660 N-660 N-660 30%- 50%- 325BA 325BA Nat.

The compression set remains the same or is reduced slightly upon the substitution of the mineral black for the N-550 material.