Answer: Heat shrink tubing can be divided into 6 types according to its use, including PE single wall heat shrink tubing, double wall heat shrink tubing with adhesive, high temperature heat shrink tubing, busbar heat shrink tubing, medium thick wall heat shrink tubing (which can be divided into thick wall heat shrink tubing with adhesive and thick wall heat shrink tubing without adhesive), and patterned heat shrink tubing.
PE single wall heat shrink tubing mainly has the function of insulation protection, is easy to shrink, is inexpensive, and comes in a variety of colors, including seven conventional colors such as red, blue, green, yellow, white, transparent, and black, with strong selectivity available. The busbar heat shrink tubing is generally made of PE single wall heat shrink tubing. The higher the pressure resistance level and the thicker the wall thickness, the better the insulation effect can be achieved. The specifications are relatively complete, ranging from Φ 0.5mm to Φ 250mm, with a wide range of choices available.
Double walled heat shrink tubing with adhesive layer on the inner wall has waterproof and moisture-proof functions. The hot melt adhesive on the inner wall melts when exposed to heat, filling the gap between the workpiece and the heat shrink tubing to prevent the entry of water vapor and moisture, achieving better protection and improving the service life of cables outdoors. There are fewer specifications, Φ2.4mm～Φ52mm， The yield ratio is 3:1 and 4:1, respectively.
High temperature resistant heat shrink tubing refers to heat shrink tubing with a working temperature of ≥ 150 ℃, divided into four grades: 150 ℃, 175 ℃, 200 ℃, 260 ℃, etc. The material of high temperature resistant heat shrink tubing is relatively special and can withstand oil and chemicals (some oil, some chemicals). Generally used in environments that require high temperature resistance. High temperature resistant shrink tubing is generally used as a protective sleeve for precision components, so specifications below Φ 40 are more common, and can be made up to Φ 0.8mm.

The heat shrink tubing of the busbar has extremely high insulation performance. Busbar heat shrink tubing is used for insulation protection of substation busbars and high and low voltage switchgear busbars. Busbar heat shrink tubing can make the structure of the switchgear compact (shorten the phase to phase distance) and prevent occasional short circuit accidents.
Thick walled heat shrink tubing, as the name suggests, has a thicker wall and excellent mechanical properties, including wear resistance and tensile strength; Thick walled pipes with adhesive have waterproof properties, while thick walled pipes without adhesive are generally used indoors. Thick walled heat shrink tubing is commonly used as an outer layer protection for communication cables, as well as for the connection and insulation protection of high-voltage cables. Thick walled heat shrink tubing serves as a protective sleeve for large objects, with specifications ranging from approximately 10mm to 300mm.

The function of patterned heat shrink tubing is anti slip decoration, mainly used in high-end selfie telescopic rods, fishing equipment, fitness equipment, daily necessities, various tools, kitchen appliance handles and other fields for anti slip decoration.