GB 18045-2000Safety glass for railway rolling stock (English PDF)

3.1 Tempered Laminated Glass

When the laminated glass product that is composed of more than two glass plates has at

least one tempered glass, it is called tempered laminated glass.

3.2 Insulated Safety Glass

The product, that is made of two or more sheets of laminated or tempered glass,

juxtaposed with uniform clearance which is filled inside with dry air close to air pressure

outside or other gases, and sealed along its perimeter.

3.4 Datum Edge

The lower edge of the glass fitted to a vehicle.

4.1 The type and mark of safety glass for railway rolling stock are shown in Table 1.

4.2 Example of Marking

5.1 Requirements of Tempered Glass

5.1.1 Thickness

The thickness of tempered glass and its allowable tolerance shall comply with Table 3.

5.1.2 Dimensional Tolerance

5.1.2.1 The allowable dimensional tolerance of rectangular or square tempered flat glass

is shown in Table 4; however, it shall be negotiated by both the buyer and the seller in case

that it complies with any of the provisions 1) ~4).

5.1.2.2 The allowable dimensional tolerance of tempered flat and bent glass of other

shapes but rectangles and squares is shown in Table 5; however, it shall be negotiated by

both the buyer and the seller in case that it complies with any of the provisions 1) ~3).

5.1.5 Appearance

The appearance quality of tempered glass is shown in Table 7.

5.1.6 Transmittance

Three test pieces shall be taken for test. The transmittance of every test piece must be

more than 50%. The transmittance of colored glass shall be negotiated between the buyer

and the seller.

in a 100mm×100mm square with this part included must be more than 160.

5.2 Requirements of Laminated Glass

5.2.1 Thickness

The nominal thickness of laminated glass is the sum of the nominal thickness of both pane

glass and the interlayer, and shall be agreed on by the buyer and the seller.

The thickness of laminated glass and its allowable tolerance are shown in Table 9.However,

for the bent laminated glass, the laminated glass made up of more than 3 panes, the

tempered laminated glass and the laminated glass with a nominal thickness more than

13mm, the thickness and their allowable tolerance shall be agreed upon by the buyer and

the seller.

5.2.2.2 The allowable dimensional tolerance of flat and bend laminated glass of the shape

other than rectangles and squares is shown in Table 11.However, the allowable

dimensional tolerance of the laminated glass made up of more than 3 panes, the laminated

glass with a nominal thickness more than 13mm and the laminated glass with the length

of its one side over 2400mm shall be agreed upon by the buyer and the seller.

5.2.11 Penetration Resistance

Six test pieces are taken for the test. The falling ball shall be 4m high and shall not

penetrate the test pieces within 5s after the impact. If the 6 test pieces comply, then it is

qualified; if 4 or less comply, then it is not qualified.

If 5 test pieces comply, another 6 fresh test pieces shall be taken for the test. If all of the 6

fresh test pieces comply, then it is qualified.

5.3 Requirements of Insulated Safety Glass

5.3.1 Thickness

The thickness of insulated safety glass is the sum of the nominal thickness of both pane

glass and the air layer, and shall be agreed on by the buyer and the seller.

The allowable thickness tolerance of insulated safety glass is shown in Table 14.However,

for the products with more than 2 air layers or the products whose pane glass is 15mm in

one sheet, the bent insulated glass and the products made up of more than 2 layers of

laminated glass, then their allowable thickness tolerance shall be agreed upon by the buyer

and the seller.

5.3.2.2 The allowable dimensional tolerance of insulated safety glass of the shape other

than rectangles and squares is shown in Table 16.However, the allowable dimensional

tolerance of the products with its length over 2200mm or with more than 2 air layers shall

be agreed upon by the buyer and the seller.

6.1 Test Methods of the Thickness and Dimensions of Safety Glass

6.1.1 Determination of Thickness

A micrometer in conformity with GB 1216 or any other instrument of the equivalent

accuracy is adopted to measure the midpoint of every side of the glass. The arithmetic

mean value of the measuring results is the thickness value, rounded to 2 decimal places

in mm.

6.1.4 Determination of Curvature Tolerance

Take bent products as test pieces for determination of curvature tolerance. Put the test

piece on the test mold as shown in Figure 1.Use a clearance gauge accurate to 0.1mm to

measure the clearance between the glass test piece and the test mold.

6.2 Test Methods of Appearance of Safety Glass

Take the products as test pieces. Under the conditions of good natural light or scattering

illumination, conduct a visual test at 500mm away from the glass surface. In determining

the length or diameter of apparent defects, a metal ruler, accurate to 0.5mm as required

by JB 2546, shall be used.

6.3 Test Methods of Basic Characteristics

6.3.1 Transmittance Test

Take the product or the test piece as the sample, and carry out determination according to

GB/T 5137.2.

6.3.2 Optical Distortion Test

Take the product as the test piece, and carry out determination according to GB/T 5137.2.

6.3.4.3 Test Procedure

6.3.5 Fragmentation Test

6.3.5.1 Test Piece

Sampled from the products.

6.3.5.2 Test Rig

Exposure and printing equipment; hammer or punch with a tip curvature radius at

0.2mm±0.05mm.

6.3.5.3 Test Procedure

6.3.6.1 Test Piece

The size of test pieces is 350mm×500mm.

6.3.6.3.2 Test Rig

Use the container of steel sheet as shown in Figure 3 and bar thermometers (1°C in a

gradation, and with a range from +30°C to -70°C) or temperature indicators of the same

accuracy as above.

6.3.6.3 Test Procedure

6.3.8 Radiation Resistance Test

The laminated glass, whose test piece size is 76mm×300mm, follows GB/T 5137.3 to carry

out the test.

6.3.9 Penetration Resistance Test

The laminated glass, whose test piece size is 300mm×300mm, follows GB/T 5137.3 to

carry out the test.

7.1 Classification of Inspection

The inspection includes exit-factory inspection and type inspection.

7.1.1 Exit-factory inspection. the inspection item includes thickness, dimensional tolerance,

appearance, warpage, curvature tolerance and dew point. Any request for additional

inspection items shall be agreed upon by the buyer and seller.

7.2 Lot Grouping and Sampling Rules

7.2.1 The test of products on their thickness, dimensional tolerance, appearance, warpage,

curvature tolerance and dew points shall make random sampling according to Table 22.If

the lot range of dew point test is less than 15 pieces, at least 5 pieces shall be sampled for

the test.

7.2.2 For other technical performance required for the product, if tested by the product, it

shall be sampled in number as required by the test item. If the test uses test pieces, the

test pieces shall be prepared under the same process conditions.

7.3 Determination Rules

If the rejection number of thickness, dimensional tolerance, appearance, warpage and

curvature tolerance is greater than or equal to that as specified in Table 22, then the lot of

the products is deemed as unqualified in respect of the thickness, dimensional tolerance,

appearance, warpage and curvature tolerance respectively.

8.1 Packaging

The product shall be packed in containers or wooden crates. Every sheet of glass shall be

packaged with paper or furnished with other protective measures. Between the glass and

the packing case, it shall be filled with light and soft materials, such as scratches, that will

not cause apparent defects to glass. The detail requirements shall comply with JC/T 512.

8.2 Marking

The marking shall comply with the relevant provisions set forth in the JC/T 512.Every

packing case shall be marked outside with the words "upward, handle with care" as well

as the glass thickness, type, manufacturer name or trademark.

8.3 Transportation

......