Drying up your damp crawlspace with crawlspace encapsulation is the first step towards a clean and healthy environment ready for living, storage, and play. Waters Basement Services can turn your musty, humid, wet crawspace into a bright order-free space.
The Rockwell hardness test is the most used and versatile of the hardness tests. For soft materials such as copper alloys, soft steel, and aluminum alloys a 1/16 diameter steel ball is used with a 100-kilogram load and the hardness is read on the B scale.
The surface roughness is evaluated by the height, Rt and mean roughness index Ra of the micro-irregularities. Surface roughness number Represents the average departure of the surface from perfection over a prescribed sampling length, (usually selected as 0.8 mm) Surface roughness number (Ra) is expressed in microns.he surface roughness is evaluated by the height, Rt and mean roughness index Ra of the micro-irregularities. Surface roughness number Represents the average departure of the surface from perfection over a prescribed sampling length, (usually selected as 0.8 mm) Surface roughness number (Ra) is expressed in microns.