GB/T 4851-2014Measurement of static shear adhesion for adhesive types (English PDF)

3.1 Static shear adhesion

It is the resistance of the pressure sensitive adhesive against shear when forces are

exerted parallel to the bonding surface.

3.2 Roughness average

It is the arithmetic average deviations of surface roughness profile, i.e. the arithmetic

average of surface roughness profile offset absolute values within the sampled length.

3.3 Test assembly

It is the assembly formed after the adhesive tape to be tested is applied to the test

-- diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone), non–residual grade;

-- methanol;

-- methyl ethyl ketone;

-- acetone;

-- n-heptane;

-- isopropyl alcohol;

-- 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 dispensing

system.

5.3 Apparatus

5.3.1 Test piece cutter

A test piece cutter shall hold two single edge razor blades in parallel planes a precise

distance apart, to form a cutter of exact test piece width; two cutters, 12 mm and 24

mm cutting width, shall be available or appropriate alternatives which will not cause

edge damage. The precision of the razor blade separation shall be the nominal width

± 0.1 mm.

5.3.2 Stainless steel panels

These shall be perfectly flat, at least 125 mm long and 50 mm wide and at least 1,1

mm thick, stainless steel (hereinafter referred to as steel panel) type in accordance

with the 06Cr19Ni10 quality defined in GB/T 3280-2007, having a bright annealed

finish with a surface roughness (GB/T 2523-2008) of 50 nm ± 25 nm.

Panels showing stains, discoloration or many scratches are not acceptable. New

panels shall be cleaned prior to use as described in 5.5.2. Between uses the panel test

surface shall be protected from scratches and contamination and the panels shall be

stored in the conditions described in 5.4.1.

5.3.3 Roller mechanically or hand operated

5.3.3.1 A cylindrical steel roller (hereinafter referred to as roller) 85 mm ± 2.5 mm in

diameter and 45 mm ± 1.5 mm in width, covered with rubber approximately 6 mm in

thickness, having a Shore A durometer hardness of 80 ± 5. The surface shall be a true

cylinder, void of any convex or concave deviations. The mass of the roller shall be 2

kg ± 0.1 kg.

5.3.3.2 No part of the apparatus shall increase the mass of the roller during use. The

5.4.6 Apply the test pieces within 5 minutes after unwinding.

5.5 Procedure

5.5.1 Standard test conditions

Standard test conditions shall be the same as 5.4.1 for test pieces and test samples

conditioning.

5.5.2 Preparation of the panel

5.5.2.1 Dispense one of the solvents listed in 5.2.2 on to the panel, wiping it to

dryness with fresh absorbent cleaning material. Repeat for a total of three washes with

this solvent.

Final wipe shall be with methyl ethyl ketone or acetone. The panel should be allowed

to dry for at least 10 min. Panels not used within 10 h should be recleaned.

In order to obtain consistent results a new panel shall be wiped at least ten times with

final solvent before use.

NOTE. Discard plates showing stains, discoloration, or many scratches. Avoid

contacting panel surface with fingers. During storage panel should, be protected from

damage or contamination.

5.5.3 Shear adhesion

5.5.3.1 Test piece preparation

Centre the test piece at one end of the test panel and apply without added pressure to

cover an area of 12 mm ± 0.5 mm by 12 mm ± 0.5 mm, unless other dimensions are

specified. The exposed adhesive of the free area of the test piece may be masked.

To prevent damaging the test piece by the end of the panel during roll down, place

another panel of the same or slightly lesser thickness under the free masked end of

the test piece, and in contact with the end of the panel prior to roll down. Roll down the

applied test area twice, once in each lengthwise direction.

Prepare at least 3 test pieces. Individually prepare each test piece and begin test within