Shore durometer The basic test requires applying the force in a consistent manner, without shock, and measuring the hardness (depth of the indentation). If a timed hardness is desired, force is applied for the required time and then read. The material under test should be a minimum of 6 mm (0.25 inches) thick. The ASTM D2240 standard recognizes twelve different durometer scales using combinations of specific spring forces and indentor configurations. These scales are properly referred to as durometer types; i.e., a durometer type is specifically designed to determine a specific scale, and the scale does not exist separately from the durometer.
Michigan Shore-to-Shore Trail Michigan Shore-to-Shore Trail The Michigan Shore-to-Shore Trail (also known as the Michigan Riding and Hiking Trail) is a trail that runs between Empire on Lake Michigan and Oscoda on Lake Huron across the Lower Peninsula of Michigan. It is open to horseback riders and hikers but not bicycles. The trail's western end is located within the Sleeping Bear Dunes National Lakeshore. The trail, going from west to east, travels through the Boardman River valley and follows the Au Sable River for about . The trail was developed by trail riders in 1962 and travels through mixed hardwood and conifer forests.