GB/T 2792-2014Measurement of peel adhesion properties for adhesive tapes (English PDF)

3.1 Peel strength

It refers to the force required to peel a unit width of adhesive tape from a specific adhesive surface at a specified angle and speed, in unit of N/cm.

3.2 Test assembly

It refers to the assembly formed by pasting the adhesive tape to be tested behind the steel plate.

3.3 Roughness average

- methanol;

- methyl ethyl ketone;

- acetone;

- n-heptanone;

- a mixture of n-heptane and a fluorinated hydrocarbon, such as refrigerant (suitable when toxicity or flammability restrictions apply).

Solvents shall be of general purpose chemical grade and held in a suitable vessel.

5.3 Apparatus

5.3.1 Test piece cutter

An appropriate test piece cutter shall hold two single edge razor blades in parallel planes a precise distance apart, to form a cutter of exact specimen width; two cutters, 12mm and 24mm cutting widths, shall be available or appropriate alternatives which will not cause edge damage. The precision of the razor blade separation shall be the nominal width ± 0.1mm.

5.3.2 Testing machine

A constant rate of extension (CRE) tension tester shall be used. It is proposed to use an automatic recorder taking at least one reading per mm of the adhesive tape peeled. The tester shall have two clamps calibrated to the same centerline, parallel with the direction of the motion on the same plane and so aligned that they will clamp the specimen wholly. MOVE at a uniform rate of (5.0 ± 0.2) mm/s.

RECORD the load reading. The maximum permissible error shall be 2%.

5.3.3 Stainless steel plates

The surfaces of the stainless steel plates shall be perfectly flat, at least 125mm long, 50mm wide and 1.1mm thick. Stainless steel types shall comply with the

06Cr19Ni10 material specified in GB/T 3280-2007. The stainless steel plates (hereinafter referred to as “steel plates”) shall have a bright annealed finish with a surface roughness (GB/T 2523-2008) of (50 ± 25) nm.

The steel plates showing stains, discoloration or many scratches are not acceptable. The steel plates shall be cleaned prior to use as described in

Section 5.5.2. The steel plate test surface shall be protected from scratches and contamination during use, and shall be stored according to the conditions described in Section 5.4.1.

The standard test conditions are as follows: the ambient temperature shall be (23 ± 1) °C; the relative humidity shall be (50 ± 5) %.

5.5.2 Preprocessing of the steel plates

5.5.2.1 USE one of the solvents described in Section 5.2.2 to clean the steel plates. USE fresh absorbent cleaning material to wipe the steel plates to dryness. REPEAT for a total of three washes with the same solvent. USE methyl ethyl ketone or acetone for cleaning during the final wipe.

5.5.2.2 After washing, DRY the steel plates for at least 10min. The testing

steel plates that have not been used within 10h need to be cleaned again. In order to obtain consistent results, USE methyl ethyl ketone or acetone to clean new steel plates for at least 10 times before use.

Note: DISCARD the steel plates with stains, discoloration or many scratches. AVOID contacting the surfaces of the steel plates with fingers. During storage, the steel plates shall be protected from damage or contamination.

5.5.3 Sample preparation and test for the peel strength

5.5.3.1 Sample preparation

As described in Section 5.4.4, CUT a 300mm long test piece from the adhesive tape to be tested. FOLD 12mm at one end, adhesive surface to adhesive surface to form a tab. TOUCH the other end of the test piece to an end of the steel plate. HOLD the tabbed end of the test piece so that it does not make contact with the steel plate, but is positioned loosely above it. ROLL mechanically or by hand twice in each lengthwise direction, so as to prevent entrapment of air between adhesive surface and steel plate. Should this occur,

DISCARD the test piece, and MAKE preparation again.

Individually PREPARE each test piece. TEST within 1min.

Note: Peel strength increases with the dwell time of various adhesive tapes. If it is necessary to select longer dwell time, MAKE further indications.

5.5.3.2 Peel strength test

PEEL 25mm of the adhesive tape from the steel plate at the folded end of the adhesive tape. CLAMP one end of the steel plate into one of the jaws of the tensile testing machine. CLAMP the free end of the adhesive tape into the other jaw. CONDUCT continuous peeling at the rate of (5.0 ± 0.2) mm/s.

After the load jaw is in operation, DISREGARD the values obtained while the first 25mm of the adhesive tape is mechanically peeled. USE the average force preparation again. Individually PREPARE each test piece and DETERMINE the peel strength within 1min.

6.4.2.2 The peel strength test is same as Section 5.5.3.2.

6.5 Test results

As Section 5.6.

6.6 Test report

As Section 5.7.

7.1 Principle

The method 3 specifies the test method of the force required to peel the double- sided or transfer adhesive tape from the surface of the stainless steel plate being covered by a 25µm polyester film.

APPLY a length of double-sided or transfer adhesive tape to a steel plate. FIX the steel plate on one clamp of a tensile testing machine. USE the other clamp of the testing machine to clamp the free end of the adhesive tape. Continuously

PEEL the clamp from the free end at an angle of 180°. MEASURE the force required to peel the double-sided or transfer adhesive tape continuously from the steel plate. CONVERT to the peel strength afterwards. PAY attention that the line of separation shall be perpendicular to the direction of the applied force.

7.2 Materials

As Section 5.2.

- Polyester film with a thickness of 25µm, which is approximately 3mm wider than the test piece to be tested (the polyester film is typically 27mm wide).

7.3 Apparatus

As Section 5.3.

7.4 Test samples and test pieces

by hand, so as to prevent entrapment of air between adhesive tape and polyester film.

REMOVE the adhesion-resistant material of the adhesive tape. FOLD 12mm at one end, adhesive surface to adhesive surface to form a tab. TOUCH the other end of the test piece to an end of the steel plate. HOLD the tabbed end of the test piece so that it does not make contact with the steel plate, but is positioned loosely above it. ROLL mechanically or by hand once in each lengthwise direction, causing the roller to apply the adhesive tape to the steel plate. PAY attention to prevent entrapment of air between adhesive tape and steel plate.

Should this occur, DISCARD the test piece.

7.5.4.2 Peeling the test piece from the steel plate

As Section 5.5.3.2.

7.6 Test results

As Section 5.6.

7.7 Test report

As Section 5.7.

- The test report of the external or internal adhesive surface of the adhesive tape.

8.1 Principle

The method 4 specifies the test method of the force required for removing the adhesion-resistant material from the adhesive tape at an angle of 180°.

8.1.1 Double-sided adhesive tapes

APPLY a length of double-sided adhesive tape to the steel plate. CLAMP one end of the steel plate in one jaw of a tensile testing machine. USE the other jaw to clamp the free end of the adhesion-resistant material. PEEL the adhesion- resistant material from the adhesive tape at an angle of 180°. MEASURE the peel force by the force required to continuously peel the adhesion-resistant

Annex A (Normative)

Test method of peel strength for adhesive tapes at low temperature

A.1 Principle

This Annex specifies the test method of the force required to peel the adhesive tape from the object surface under selected low-temperature condition according to one of the methods in this Standard.

Before testing, APPLY the adhesive tape onto the test plate surface according to the method introduced in this Standard. PLACE for 16h to 24h under selected low-temperature condition.

A.2 Apparatus

- USE a suitable apparatus according to the test method;

- USE a suitable constant temperature and humidity incubator or environmental chamber according to the temperature requirements.

A.3 Test samples and test pieces

A.3.1 PLACE the test samples, test pieces and steel plates (after cleaning) at selected low temperature for 2h.

A.3.2 CONDUCT the test according to corresponding test method.

A.4 Test procedures

A.4.1 CONDUCT the entire test at selected low temperature.

A.4.2 CONDUCT the test according to corresponding test method. After peeling, PLACE the test pieces at low temperature for 16h to 24h.

A.5 Test report

As Section 5.7. INDICATE the test methods and temperatures specified in the annexes of this Standard.

category descriptions in the “Scope” of ISO standard in another paragraph so that the overview of the standard's technical contents can be explicit.

Section 5.2.2 ADD the “isopropanol” as cleaning agent.

In order to adapt to China's technical conditions.

Section 5.4.1

ADD the following content: PLACE the samples under standard environmental conditions for more than 24h.

INCREASE maneuverability, so as to facilitate the implementation of this

Standard.

Section 5.4.2

MODIFY the following note to paragraph: When the width of the test sample is less than 24mm, TEST in accordance with the actual width of the test sample.

Furthermore, MAKE indications in the test results.

According to the requirements of

GB/T 1.1-2009 and China's actual situation, INCREASE maneuverability, so as to facilitate the implementation of this Standard.

Section 5.4.4

ADD the following content: PREPARE at least three test pieces for each test.

INCREASE maneuverability, so as to facilitate the implementation of this

Standard.

Section 5.6

ADD the following content: There shall be at least 3 test pieces in each group.

INCREASE the data accuracy.

Section

7.5.3.1

MODIFY the following note to paragraph: The two passes of the roller in applying polyester film may be made by using a hand roller. The rolling rate may be increased to 50 mm/s.

According to the requirements of

GB/T 1.1-2009 and China's actual situation, INCREASE maneuverability, so as to facilitate the implementation of this Standard.

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