YS/T 95.2-2016Aluminum foil for air conditioner - Part 2: Precoated aluminum foil (English PDF)

3.1 Product classification

3.1.1 Coating structure

See Figure 1 for coating structure.

3.1.4 Marking

The marking of the precoated foil is expressed in the order of product name,

standard number, product model, function code, designation, state, and size

specifications. Marking examples are as follows.

3.2 Chemical composition

The chemical composition of the precoated foil (except Cd, Pb, Hg, Cr6+) shall

comply with the requirements of YS/T 95.1.The limits of harmful elements or

harmful substances in the precoated foil shall comply with the requirements of

Table 2.

3.4 Adhesion

The precoated foil shall be easy to expand over the entire length of the roll, no

sticking or tearing when unfolded.

3.5 Mechanical properties, process performance

The tensile mechanical properties and process properties of the precoated foil

shall meet the requirements of YS/T 95.1.

3.7 Appearance quality

3.7.1 The surface color of the precoated foil is determined by both parties. There

shall be no obvious chromatic aberration, leakage coating, corrosion, holes, etc.,

which affect the performance of the coating and the defects of the user. Defects

such as subtle color points, imprints, etc. that do not affect the use are allowed.

4.1 Chemical composition

4.2 Size deviation

The size deviation of precoated foil is inspected according to YS/T 95.1.

4.3 Adhesion

Adhesion is inspected by unrolling the precoated foil roll.

4.6 Hydrophilicity

Hydrophilicity is tested according to the method specified in GB/T 22638.9.The

type of no-clean volatile oil used in the process of hydrophilic angle detection is

negotiated between the supplier and the purchaser and specified in the order

form (or contract). When the purchaser has special requirements on drying

temperature and drying time, it shall be indicated in the order form (or contract).

4.7 Anti-cupping

Carry out the test according to the provisions of GB/T 9753.Indentation depth

is 5mm.

4.9 Bending resistance

Make the end of the sample (in the length direction, the area 13mm~20mm from

the end) bend 180°, that is, bend to the two planes of the sample (0T as shown

in Figure 2). Make the two flat fitting parts of the sample bend 180° (1T as shown

in Figure 2). After the folded portion of the sample is bent by 180° (2T as shown

in Figure 2), the bending shall be continued for 180° (3T as shown in Figure 2).

Adhesive tape with adhesion greater than 10N/25mm is covered on the curved

surface of the top of the folded portion of the sample (end point along the length

of the sample). Press to remove the air under the adhesive tape. Quickly pull

up the tape. Observe the coating for delamination.

4.11 Heat and humidity resistance

The test method for heat and humidity resistance is carried out in accordance

with the provisions of GB/T 1740.The determination level is in accordance with

the provisions of GB/T 6461.The defect area and corresponding protection

level generated by the test are shown in Table 4.

4.17 Solvent resistance

Wrap a 1kg hammer with at least six layers of gauze. The diameter of the

contact surface between the hammer and the sample is 14mm ± 0.5mm. After

the iron wrapped with the gauze is filled with methyl ethyl ketone, the surface

of the sample is rubbed along the same straight path along the same straight

path, at a rate of one round trip per second. Wipe one back and forth as one

time, 30 times in total. Observe whether the bottom is exposed. The gauze shall

be kept moist during the test.

4.19 Coating antibacterial property

Antibacterial property of precoated foil is inspected according to GB/T 21866.

4.20 Inspection method of appearance quality

Appearance quality is visually inspected.

5.1 Check and acceptance

5.1.1 The precoated foil shall be inspected by the supplier to ensure that the

product quality complies with the provisions of this Part (or order contract). And

fill in the quality certificate.

5.3 Weighing

The product shall be weighed according to actual weight.

5.4 Inspection items

Each batch of precoated foil shall be subject to the inspections of chemical

composition (except Cd, Pb, Hg, Cr6+), tensile strength, elongation after break,

cupping value, size deviation, adhesion, joint, appearance quality, initial

hydrophilic angle, anti-cupping, adhesion, bending resistance.

5.6.4 If the inspection result of harmful elements or harmful substances in any

sample or the inspection result of coating performance is unqualified, this batch

of products shall be determined as unqualified.

5.6.5 If the appearance quality of any product is unqualified, the product

represented by the sample shall be determined as unqualified.

6.1 Marks

6.1.1 Product mark

Mark (or label) the precoated foil on each roll that has passed the inspection.

The following information shall be marked.

6.1.2 Packaging box mark

The packaging box mark for precoated foil shall comply with GB/T 3199.

6.2 Packaging, transport, storage

Precoated foil roll packaging is divided into packaging box and simple

packaging. The packaging method shall be agreed by the supplier and the

purchaser and shall be indicated in the order form (or contract). Transport and

storage are in accordance with GB/T 3199.

6.3 Quality certificate

Each batch of precoated foil shall have quality certificate that meet the

requirements of this Part, indicating the following information.