GB/T 18915.1-2013Coated glass－Part 1: Solar control coated glass (English PDF)

3.1 Coated glass

Through physical or chemical methods, one layer or multiply layers of metal, metallic compound or nonmetallic compound coatings are applied on the glass surface to meet special requirements of glass products.

3.2 Solar control coated glass

Through the coating-layer, the optical property is changed. It refers to the coated glass that has the selective reflection and absorptive action against the sunlight with wavelength range of 300nm-2500nm.

3.3 Pinhole

Observed from the coating surface of coated glass, it refers to the transparent dot-shape defects that are caused by glass not attached with coating-layer or coating-layer too thin.

3.6 Dark stripe

Observed from the glass surface of coated glass, it refers to the strip-shape area of which the brightness or reflection color is different from the entirety.

5.1 Requirements and test methods for solar control coated glass

The corresponding chapter of the requirements and test methods for solar control coated glass are shown in Table 1.

5.2 Size deviation, thickness deviation, diagonal difference and curvature

5.2.1 Size deviation, thickness deviation, diagonal difference and curvature of non-tempered solar coated glass shall comply with the requirements of GB 11614.

5.3 Appearance quality

5.3.1 Appearance quality of solar control coated glass substrates shall comply with various substrates' own standard requirements.

5.3.2 The appearance quality of solar control coated glass shall comply with the provisions of Table 2.

5.6 Abrasive resistance

The absolute value of visible light transmittance difference value of specimen before and after the test shall not be greater than 4%.

5.7 Acid resistance

The absolute value of visible light transmittance difference value of specimen before and after the test shall not be greater than 4%. The coating-layer change shall be uniform and the local coating is not allowed to fall-off.

6.2 Determination of curvature

6.3 Determination of the appearance quality

6.3.1 Determination of pinholes, spots and scratches

In an environment not affected by the ambient light, put the specimen vertically at the position 600 mm away from the screen.

6.3.2 Determination of stains and dark stripes

Under uniform illumination of natural scattered light, vertically PLACE the glass specimen. The surface of glass faces the observer.

6.4 Determination of optical performance

6.4.1 Sampling methods

For non-tempered solar control coated glass, randomly DRAW 3 pieces of products

6.4.2 Determination methods

USE anhydrous ethanol to clean both surfaces of specimen. Test it according to the methods specified in GB/T 2680 after natural drying.

6.5 Determination of color uniformity

6.5.1 Measuring methods

MEASURE according to the methods specified in GB/T 11942. Color uniformity is expressed by chromatic aberration. The measured chromatic aberration shall be the chromatic aberration of reflection color.

6.5.2 Sampling methods

6.5.2.1 Monolithic chromatic aberration sampling

CUT out 100mmX100mm specimen from the 4 corners and central part of any piece of products, total 5 specimens. When sampling, the distance between the outer edge of specimen and product edge shall be 50mm (as shown in Figure 4).

6.6 Determination of abrasive resistance

6.6.1 Sampling methods

Randomly DRAW 3 pieces from the same batch of products. CUT out 100mmX100mm of specimen on each piece of product, total 3 pieces. For tempered and semi-tempered solar control coated glass, CUT out specimen from the non-tempered solar control coated glass made by the same process.

6.7 Acid resistance

7.1 Inspection classification

7.1.1 Ex-factory inspection

Ex-factory inspection items shall be visible light transmittances in 5.2, 5.3 and 5.4; and 5.5.

7.1.2 Type inspection

The inspection items are all the requirements specified in Chapter 5.

Type inspection shall be conducted in case of one of the following conditions. […]

7.2 Group-batch grouping and sampling

7.2.1 Group-batch

Continuously and stably produced products of the same process, same thickness, and same nominal value of visual light transmittance can compose as a batch.

7.2.2 Sampling

7.2.2.1 During ex-factory inspection, enterprises may prepare reasonable sampling plan to draw specimen, based on actual production conditions.

7.3 Decision rules

7.3.1 When measuring size deviation, thickness deviation, diagonal difference, curvature and appearance quality. For test results of each piece of glass, when all the above indicators comply with provisions of Chapter 5, it shall be qualified. For test results of a batch of glass, if the unqualified number is not more than the rejection number specified in Table 4, then the indicators of this batch are qualified; otherwise it is unqualified.

8.1 Packaging

8.1.1 Packaging wooden case or container and pallet shall respectively comply with the provisions of JC/T 513, GB/T 6382.1, and GB/T 6382.2.

8.2 Mark

There shall have manufacturer's name, trademark, product name, category, specification, quantity and color, nominal value of visible light transmittance (if any), production date, instructions, and signs of coating surface, handle with care, fragile, rain-proof, damp-proof, and stacking direction, etc. on the packaging case (pallet). […]

8.3 Storage and transportation