How to test the release force and residual adhesion rate?

Jan 12, 2026

1. Test Conditions

Ambient Temperature: 23±2℃
Ambient Humidity: 50%RH
Aging Temperature: 70℃
Aging Pressure: 3000g±50g

2. Sampling Requirements

Sampling Position: Take samples from three positions (left, middle, and right) of the test piece.
Sample Quantity: No less than 3 specimens per group; test results shall be based on the average value.
Sample Inspection: Visually check whether the samples have visible defects.
Sample Condition: Samples shall be flat and free of wrinkles.
Sample Retention: Retain the samples for subsequent retesting if necessary.

3. Test Methods

3.1 Rapid-release Force (20-minute Release Force)

a. Cut samples from different positions, attach 7475 adhesive tape to them, and roll the test piece back and forth 2–3 times with a roller.

b. Press the assembly with a 3 kg weight for 20 minutes.

c. Test the release force using a tensile testing machine and record the data.

3.2 Room-temperature Aging Release Force

a. Cut samples from different positions, attach 7475 adhesive tape to them, and roll the test piece back and forth 2–3 times with a roller.

b. Press the assembly with a 3 kg weight at room temperature for 20 hours, then remove the weight and let it stand for 2 hours.

c. Test the release force using a tensile testing machine and record the data.

3.3 High-temperature Aging Release Force

a. Cut samples from different positions, attach 7475 adhesive tape to them, and roll the test piece back and forth 2–3 times with a roller.

b. Place the assembly in an oven at 70℃, press it with a 3 kg weight for 20 hours, then remove the weight and let it stand for 2 hours.

c. Test the release force using a tensile testing machine and record the data.

3.4 Room-temperature Residual Adhesion

① Attach standard adhesive tape (Nitto 31B, 25mm in width) to the sample, roll it back and forth 2–3 times with a roller. Press the assembly with a 3 kg weight at room temperature for 20 hours, then remove the weight and let it stand for 2 hours.

② Peel off the standard adhesive tape obtained in Step ① and reattach it to a clean polyester film. Test the release force using a tensile testing machine and record the value as L1.

③ Attach a new piece of the same standard adhesive tape to a blank clean polyester film (must be the same material as used in Step ②). Test the release force using a tensile testing machine and record the value as L2.

④ Calculate the room-temperature residual adhesion rate using the formula:

3.5 High-temperature Residual Adhesion

① Attach standard adhesive tape (Nitto 31B) to the sample, roll it back and forth 2–3 times with a roller. Place the assembly in an oven at 70℃, press it with a 3 kg weight for 20 hours, then remove the weight and let it stand for 2 hours.

② Peel off the standard adhesive tape obtained in Step ① and reattach it to a clean polyester film. Test the release force using a tensile testing machine and record the value as L1.

④ Calculate the high-temperature residual adhesion rate using the formula:

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