d7e42f72_ES__INC____Roofing_Terminology__VALLEY
(1) Index of a fluid's internal resistance to flow, measured in centistokes (cSt) for bitumens. (Water has a viscosity of roughly 1 cSt; light cooking oil 100 cSt.); (2) The resistance of a material to flow under stress. For bitumen, measured in centipose. See VISCOUS. [VALLEY] 
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ARMKO INDUSTRIES, INC. - Roofing Terminology
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