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Float flat glass

Preface

This standard is revised on the basis of the original national standard GB 11614-1989 "Float Glass".

The GB11614-1989 "Float Glass" national standard is divided into high-quality products, first-class products, and qualified products. This standard was classified according to the use of float glass when revised, and it was divided into mirror-making grade , automotive grade and architectural grade. And according to different purposes, different quality indicators have been determined to facilitate the user's choice and better meet the needs of users.

In terms of technical requirements, this standard refers to the standards of JIS R3202:1996 "Float and Polished Flat Glass" and EN572-2: 1994 "Float Glass". The allowable deviation of size and thickness is higher than the original national standard, and the appearance quality The indicators are stricter than the Japanese and European standards. At the same time, the requirements for the diagonal difference of the glass have been increased, and the inspection method has also been added and appropriately modified.

This standard replaces GB11614-1989 from the date of implementation.

This standard was proposed by the National Building Materials Industry Bureau.

This standard is under the jurisdiction and interpretation of Qinhuangdao Glass Research and Design Institute of the State Building Materials Industry Bureau.

Drafting organizations of this standard: Standardization Research Institute of State Building Materials Industry Administration, Qinhuangdao Glass Research and Design Institute of State Building Materials Industry Administration.

The main drafters of this standard: Wu Qingtao, Wang Yulan, Tan Jingya, Liu Zhifu, Tian Chunxiang

 

1 Scope

This standard specifies the classification, requirements, inspection methods, inspection rules, marking, packaging, transportation and storage of colorless and transparent float glass.

This standard applies to float glass used in mirrors, automobiles and buildings.

2. Reference standards

The clauses contained in the following standards constitute the clauses of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards will be revised, and all parties using this standard should explore the possibility of using the latest version of the following standards.

GB/T 1216-1985 Outside micrometer (neq ISO 3611:1978)

GB/T 2680-1994 Determination of visible light transmittance, direct sunlight transmittance, total solar transmittance, ultraviolet transmittance and related window glass parameters of architectural glass (neq ISO 9050:1990)

GB/T 8170-1987 Numerical rounding rules

JB/T 7979-1995 feeler gauge

3. Classification

3.1 Float glass is divided into mirror grade, automotive grade, and architectural grade according to its purpose.

3.2 Float glass is divided into the following categories according to thickness:

2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 15mm, 19mm.

4. Requirements

4.1 Float glass should be square or rectangular. The allowable deviation of its length and width dimensions should meet the requirements of Table 1.

 

Table 1

Allowable deviation of size mm

Allowable deviation of thickness

Size less than 3000 size 3000-5000

2, 3, 4 ±2-

5, 6 ±3

8, 10 +2, -3 +3, -4

12, 15 ±3 ±4

19 ±5 ±5

 

4.2 The allowable deviation of the thickness of float glass should meet the requirements of Table 2. The thickness difference of the same piece of glass is 0.2mm for thickness of 2mm and 3mm; thickness of 4mm, 5mm, 6mm, 8mm, 10mm, 0.3mm.

4.3 The appearance quality of architectural-grade float glass should meet the requirements of Table 3.

 

Table 2

 

Thickness tolerance mm

Thickness tolerance

2, 3, 4, 5, 6 ±0.2

8, 10 ±0.3

12 ±0.4

15 ±0.5

19 ±1.0

 

table 3

 

Architectural-grade float glass appearance quality

Defect types and quality requirements

Allowable range of bubble length and number

Length, L

0.5mm≤L≤1.5mm length, L

1.5mm<L≤3.0mm length, L

3.0mm<L≤5.0mm length, L

L>5.0mm

5.5×S, each 1.1×S, each 0.44×S, each 0,

Allowable range of length and number of inclusions

Length, L

0.5mm≤L≤1.0mm length, L

1.0mm<L≤2.0mm length, L

2.0mm<L≤3.0mm length, L

L>3.0mm

5.5×S, each 1.1×S, 0.44×S, each 0, each

Point defect

Bubbles with a concentration length greater than 1.5mm and inclusions with a length greater than 1.0mm; the distance between bubbles and bubbles, inclusions and inclusions, or bubbles and inclusions should be greater than 300mm

The thread should not be visible to the naked eye according to 5.3.1

Scratch length and width allowable range and number

0.5mm wide, 60mm long, 3×S, strip

Incident angle of optical distortion: 2mm 40°; 3mm 45°; 50° above 4mm

Surface cracks should not be visible to the naked eye according to 5.3.1

Sectional defects, burst edges, bumps, missing corners, etc. should not exceed the thickness of the glass plate

 

Note: S is the area of ​​the glass plate in square meters, with two decimal places reserved. The allowable range of the number of bubbles and inclusions and the number of scratches is the value obtained by multiplying each coefficient and S, which should be rounded to an integer according to GB/T 8170

 

4.4 The thickness of automobile-grade float glass is mainly 2mm, 3mm, 4mm, 5mm and 6mm. Its appearance quality should meet the requirements of Table 4.

4.5 The thickness of mirror-grade float glass is mainly 2mm, 3mm, 5mm, and 6mm. Its appearance quality should meet the requirements of Table 5.

4.6 The diagonal difference of float glass should not be more than 0.2% of the average diagonal length.

4.7 The curvature of float glass should not exceed 0.2%.

4.9 The float glass with special requirements shall be negotiated by the supplier and the buyer.

 

Table 4

 

Appearance quality of automotive-grade float glass

Defect types and quality requirements

Allowable range of bubble length and number

Length, L

0.3mm≤L≤0.5mm length, L

0.5mm<L≤1.0mm length, L

1.0mm<L≤1.5mm length, L

L>1.5mm

3×S, each 2×S, each 0.5×S, each 0, each

Allowable range of length and number of inclusions

Length, L

0.3mm≤L≤0.5mm length, L

0.5mm<L≤1.0mm length, L

L>1.5mm

 

2×S, each 1×S, each 0, each

 

Point defect

Bubbles with a concentration length greater than 1.0mm and inclusions with a length greater than 0.5mm; the distance between bubbles and bubbles, inclusions and inclusions, or bubbles and inclusions should be greater than 300mm

The thread should not be visible to the naked eye according to 5.3.1

Scratch length and width allowable range and number

Width 0.2mm, length 40mm, 2×S, strip

Optical distortion angle of incidence: 2mm 45°; 3mm 50°; 4mm, 5mm, 6mm above 60°

Surface cracks should not be visible to the naked eye according to 5.3.1

Sectional defects, burst edges, bumps, missing corners, etc. should not exceed the thickness of the glass plate

 

Note: S is the area of ​​the glass plate in square meters, with two decimal places reserved. The allowable range of the number of bubbles and inclusions and the number of scratches is the value obtained by multiplying each coefficient and S, which should be rounded to an integer according to GB/T 8170

 

table 5

 

Appearance quality of mirror-grade float glass

Defect types and quality requirements

The length and number of bubbles 2mm allowable range 3mm, 5mm, 6mm length and number

Allowable range

Length, L

0.3mm≤L

≤0.5mm length, L

0.5mm≤L

≤1.0mm length, L

1.0mm<L≤1.5mm length, L

L>1.5mm length, L

0.3mm≤

L≤0.5mm length, L

0.5mm<L≤1.0mm length, L

1.0mm<L≤1.5mm length, L

L>1.5mm

2×S, each 1×S, each 0.5×S, each 0, each 3×S, each 2×S, each 0.5×S, each 0, each

Inclusions 2mm glass length and number allowable range 3mm, 5mm, 6mm glass length and number allowable range

Length, L

0.3mm≤L

≤0.5mm length, L

0.5mm<L

≤1.0mm length, L

L>1.0mm length, L

0.3mm<L≤0.5mm length, L

0.5mm<L≤1.0mm length, L

L>1.0mm

2×S, each 0.5×S, each 0, each 1×S, each 0.5×S, each 0, each

Point defect

The distance between bubbles and inclusions with a concentration length greater than 0.5mm should be greater than 300mm

The thread should not be visible to the naked eye according to 5.3.1

Scratch length and width allowable range and number

0.1mm wide, 30mm long, 2×S, strip

Optical distortion angle of incidence: 2mm 45°; 3mm 55°; 5mm, 6mm 60°

Surface cracks should not be visible to the naked eye according to 5.3.1

Sectional defects, burst edges, bumps, missing corners, etc. should not exceed the thickness of the glass plate

 

Note: S is the area of ​​the glass plate in square meters, with two decimal places reserved. The allowable range of the number of bubbles and inclusions and the number of scratches is the value obtained by multiplying each coefficient and S, which should be rounded to an integer according to GB/T 8170

 

Table 6

 

Visible light transmittance of float glass

Thickness, mm visible light transmittance,%

2 89

3 88

4 87

5 86

6 84

8 82

10 81

12 78

15 76

19 72

 

5. Inspection method

5.1 Measurement of size

Use a steel tape with a minimum graduation of 1mm to measure the distance between the two parallel sides.

5.2 Thickness measurement

Use an external micrometer with an accuracy of 0.01 mm or an instrument with the same accuracy as specified in GB/T 1216 to measure at the midpoint of the four sides within 15 mm from the edge of the glass plate. The thickness difference of the same piece of glass is the maximum value of the four measured values The difference between the minimum values.

5.3 Appearance quality determination

5.3.1 Determination of bubbles, inclusions, lines, scratches and surface lines

Without being affected by external light, as shown in Figure 1, place the sample glass vertically at a distance of 600mm from the screen (installed with several 40W parallel fluorescent lamps with a spacing of 300mm, and a black matte screen), and turn on the fluorescent lamp. , Observe below 600mm away from the sample glass. The length of bubbles and inclusions is measured with a reading microscope with a magnification of 10 times and an accuracy of 0.1 mm.

 

5.3.2 Measurement of optical distortion

As shown in Figure 2, the sample is placed vertically in the pulling direction, and the line of sight is passed through the sample to observe the screen stripes. First, the stripes are obviously deformed, and then slowly rotate the sample until the deformation disappears. Record the incident angle at this time.

5.3.3 For the measurement of section defects, use a steel ruler to measure the distance between the burst edge and the largest part of the unevenness and the edge of the board. The missing angle is measured inward along the bisecting line of the original angle.

5.4 Use a steel tape with a minimum scale of 1mm to measure the diagonal difference to measure the distance between the vertices of the corresponding corners of the glass plate.

5.5 Measurement of visible light transmittance

The visible light transmittance of float glass is measured according to GB/T 2680.

5.6 Determination of curvature

Place the glass vertically, without applying external force, arbitrarily place a 1000mm long steel ruler along the surface of the glass, and measure the maximum gap between the edge of the ruler and the glass plate with a feeler gauge that conforms to JB/T 7979-1995.

6. Inspection rules

6.1 All items specified in Chapter 4 must be inspected when the glass leaves the factory.

6.2 Product inspection shall be randomly sampled according to the glass batch and sampling number specified in Table (7).

 

Table 7

 

Sampling table

Batch range sample size qualified judgment number unqualified judgment number

≤50 8 1 2

51~90 13 2 3

91~150 20 3 4

151~280 32 5 6

281~500 50 7 8

501~1000 80 10 11

 

6.3 Judgment rules

6.3.1 The inspection result of a piece of glass is qualified if all indexes meet the requirements of this grade.

6.3.2 For a batch of glass inspection results, if the number of unqualified pieces is greater than or equal to the number of unqualified pieces in Table 7, the batch of products is considered unqualified.

7. Marking, packaging, transportation and storage

7.1 The glass should be packed in wooden boxes or containers (racks), and the boxes (racks) should be easy to load, unload and transport. The packing quantity of each box (rack) should be compatible with the strength of the box (rack). One box (rack) should be equipped with glass of the same thickness, size and grade, and protective measures should be taken between the glasses.

7.2 The packaging box (rack) should be accompanied by a certificate of cooperation, indicating the name of the manufacturer or trademark, glass grade, size, thickness, quantity, date of production, the number of this standard, and the signs of light handling , fragile, rain-proof and wet-proof or Typeface.

7.3 The box (rack) should be prevented from tipping and sliding during transportation. Rainproof measures are required during transportation and loading and unloading.

7.4 The glass must be stored in a place where there is no condensation or rainproof facilities.

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