Adhesive tapes can be classified by their functions into high-temperature tapes, double-sided tapes, insulating tapes, special tapes, pressure-sensitive tapes, and die-cut tapes. Different functions are suitable for the needs of different industries. An adhesive tape is composed of two parts: a base material and an adhesive, and it connects two or more non-connected objects together through bonding. There is an adhesive layer coated on its surface. Regarding adhesive tapes, what concerns people the most should be the quality of their adhesiveness. According to the application scenarios of adhesive tapes, there are strict regulations on the magnitude of their adhesiveness. Therefore, it is particularly important to conduct some tests on adhesive tapes. The following will introduce the standards for adhesive tape testing from the aspects of initial tack, holding power, and peel strength.

Peel Strength Test
Peel strength refers to the force required to peel a unit-width adhesive tape from a specific bonding surface at a certain angle and rate.

There are two methods for peel testing. The first is the 180° peel method, and the second is the 90° peel method. Here, the first method, the 180° peel method, will be introduced.

Stick an adhesive tape onto a stainless steel plate. Fix the stainless steel plate on one fixture of a tensile testing machine. The other fixture of the testing machine clamps the free end of the adhesive tape, forming a 180° angle with the stainless steel plate. Pull the adhesive tape apart at a specified rate, and measure the peel force by the force required to continuously peel the adhesive tape from the stainless steel plate. Then convert it into peel strength.

Holding Power Test
Holding power refers to the durability of the adhesion of a pressure-sensitive adhesive tape on an adherend when a certain weight of a weight is vertically suspended in the length direction of the adhesive tape. If the holding power is very poor, the tape is likely to fall off and fail to achieve the purpose of bonding. If the holding power is too great, it is likely to cause damage to the adherend when it is separated from the adhered object.

Initial Tack Test
Initial tack is a property of an adhesive. It enables the adhesive to form a measurable bonding strength immediately under low pressure after it comes into contact with the adherend. The quality of the initial tack directly affects the quality of the adhesive and has very important practical significance for certain applications.