How to detect the wall thickness and inner diameter of the Heat Shrinkable Tube?

The size of the Heat Shrinkable Tube we know ranges from a few tenths of a millimeter in the smallest size to a few hundred millimeters in the largest size. So how is the size of the Heat Shrinkable Tube judged?

Heat Shrinkable Tube can be divided into many types according to materials, characteristics and application fields, including single-wall Heat Shrinkable Tube, double-walled Heat Shrinkable Tube with adhesive, Teflon Heat Shrinkable Tube, busbar Heat Shrinkable Tube, silicon Rubber Heat Shrinkable Tube and more. Various types of heat-shrinkable tubes are slightly different in packaging and state. Some are packed in flattened packages, and some are packaged in tubes. Uniform measurement standard for pipe sizes.
How to divide the specifications of Heat Shrinkable Tube The professional and accurate method is: use a wall thickness gauge or projector to check, which can avoid human errors. Heat shrinkage itself has a certain degree of elasticity, so a vernier caliper is generally used for measurement. However, it is necessary to master the measurement technology during the measurement process, and the rigor of the technology will obviously affect the detection results. In the heat shrinkable tube wall thickness industry, calculate the average wall thickness: average wall thickness = (highest value + lowest point).
How to detect the inner diameter of the heat shrinkable tube: the inner diameter is commonly used with plug gauges (or mandrels). Place the plug gauge into the tube and visually check that there are no gaps around, the mandrel should be easy to place in and out of the tube. The outside diameter of the plug gauge is the inside diameter of the casing. The inner diameter value of the heat shrinkable tube usually only retains one decimal place (in mm), which is also used for the detection of projector equipment. The empirical formula for measuring the inner diameter of a larger size casing is: inner diameter ≈ folding diameter ÷ 1.57 (the folding diameter refers to the width of the casing folded in half).