GB/T 19766-2016Building slab of natural marble (English PDF)

4.1 Classification

4.1.1 Classified by mineral composition.

a) Calcite marble (code FL);

b) Dolomite marble (code name BL);

c) Serpentine marble (code SL).

4.1.2 Classified by shape.

a) Polished board (code MG);

b) Standard type plate (code PX);

c) Arc plate (code HM);

d) Irregularly shaped plate (code YX).

4.1.3 According to surface finish, it is divided into.

a) Mirror panel (code name JM);

b) Coarse panel (code CM).

4.2 Level

They are classified into three grades. A, B, and C, based on processing quality and appearance quality.

4.3 Marking

4.3.1 Name. The name or number shall be in accordance with the standard GB/T 17670.

4.3.2 Sequence. Name, Category, Specifications, Grade, Standard Number

4.3.3 Example

The following is an example of a 600mmx600mmx20mm standard, grade A, mirror-finish slab processed from Fangshan white marble blocks.

6.1 Processing quality

6.1.1 The flatness tolerance and thickness deviation of the roughened board shall conform to the provisions of Table 2.

6.1.2 The allowable deviations in the dimensions of standard steel plates shall conform to the provisions of Table 3.

6.1.3 The minimum wall thickness of the arc plate should not be less than 20mm. The allowable deviations in specifications and dimensions are shown in Table 4. The names of the various parts of the arc plate are shown in Figure 1.

6.1.4 The allowable tolerance for flatness of the standard plate is shown in Table 5.

6.1.5 The allowable tolerances for the straightness and profile of the arc plate are shown in Table 6.

6.1.6 The allowable tolerances for the angle of the standard plate are shown in Table 7.

6.1.7 Allowable tolerance for the end face angle of the arc plate. 0.4mm for grade A, 0.6mm for grade B, and 0.8mm for grade C.

6.1.8 The included angle between the front and side of the joint of a standard panel shall not exceed 90°.

6.1.9 The side angle alpha of the arc plate (see Figure 5) should not be less than 90°.

6.1.10 The specular gloss of mirrored panels should not be less than 70 gloss units. For curved panels, the specular gloss and gloss levels may vary depending on specific requirements.

The agreement is determined through negotiation between the supply and demand parties.

6.1.11 The inspection items, deviations, and methods for irregularly shaped panels shall be determined through negotiation between the supplier and the buyer.

6.2 Appearance Quality

6.2.1 The color tones of boards from the same batch should be basically harmonious, and the patterns should be basically consistent.

6.2.2 The appearance defects on the front of the sheet material shall conform to the provisions of Table 8.

6.2.3 The boards are allowed to be bonded and repaired. Bonding and repair should not affect the decorative effect of the boards or reduce their physical properties.

6.3 Physical Properties

The physical properties of the board material should conform to the specifications in Table 9. If the project has special requirements for the physical properties and indicators of the board material, those requirements shall apply. implement.

7.1 Processing quality

7.1.1 Flatness of the roughened board

Place a 1000mm steel straightedge with a flatness tolerance of 0.1mm naturally at a distance of 50mm from the edge of the board and on both sides of the surface being inspected.

On the diagonal, use a feeler gauge to measure the gap between the gauge face and the board surface. When the length of the side being inspected or the diagonal length is greater than 1000mm, use a steel straightedge along the edge.

The length and diagonal sections should be inspected separately, with the overlap not less than 1/3 of the steel straightedge length. The plane of the roughened board is represented by the measurement of the maximum gap.

The tolerance is 0.1 mm, and the measured value is accurate to 0.1 mm.

7.1.2 Thickness of the roughened board

Measure the thickness of the roughened board using vernier calipers or other measuring instruments that meet the required precision, measuring the midpoints of the four sides (see Figure 3).

Do not use the deviation between the maximum and minimum measured values and the nominal values to represent the dimensional deviation of the roughened board thickness; the measured values are accurate to 0.1 mm.

7.1.3 Standard Plate Specifications and Dimensions

Use vernier calipers or other measuring instruments that meet the required precision to measure the length, width, and thickness of the sheet metal. The length and width should be measured at [value missing] of the sheet metal.

Measurements were taken at three locations (see Figure 2), and the thickness was measured at the midpoints of the four sides (see Figure 3). The maximum and minimum measured values were compared with the nominal values.

The deviation between values represents the dimensional deviation of length, width, and thickness, with the measured values accurate to 0.1 mm.

7.1.4 Specifications and dimensions of the arc plate

Measure the chord length, height, and minimum wall thickness of the arc plate using vernier calipers or other measuring instruments that meet the required accuracy. At both ends of the arc plate... The chord length is measured at the surface (see Figure 1). The wall thickness is measured at the end face and side face of the arc plate (see Figure 1); the height of the arc plate is measured at the location shown in Figure 4.

The dimensional deviations of chord length, height, and wall thickness are expressed by the deviations between the maximum and minimum measured values and the nominal values, with the measured values accurate to 0.1 mm.

7.1.5 Flatness of Standard Plates

Place a 1000mm steel straightedge with a flatness tolerance of 0.1mm naturally on both sides of the surface being inspected, 10mm from the edge of the board.

On the diagonal, use a feeler gauge to measure the gap between the gauge face and the board surface. When the side length or diagonal length of the inspected surface is greater than 1000mm, use a steel straightedge along... The side length and diagonal are inspected in segments, and the overlap should not be less than 1/3 of the length of the steel straightedge. The plane of the plate is represented by the measurement of the maximum gap.

The tolerance is 0.1 mm, and the measured value is accurate to 0.1 mm.

7.1.6 Straightness of the arc plate

Place a 1000mm steel straightedge with a flatness tolerance of 0.1mm along the generatrix of the arc plate on the surface to be inspected, and measure the surface with a feeler gauge.

The gap between the surface and the plate is measured as shown in Figure 4. When the height of the arc plate being inspected is greater than 1000mm, use a steel straightedge along the generatrix being inspected.

Segmented measurements should be taken, with the overlap not less than 1/3 of the steel straightedge length. The straightness tolerance of the arc plate is expressed as the measured value of the maximum gap. The value is accurate to 0.1 mm.

7.1.7 Circular arc plate profile

A circular arc template with an accuracy of 0.1mm is used to naturally conform to the arc surface being inspected. The ratio of the arc length of the template to the arc length of the arc surface being inspected should not exceed [the specified value].

If the ratio is less than 2.3, use a feeler gauge to measure the gap between the gauge face and the arc surface, as shown in Figure 4. The measured value of the maximum gap represents the arc surface.

The profile tolerance of the arc plate is measured to an accuracy of 0.1 mm.

7.1.8 Angle of Standard Plate

Use a 90° steel angle ruler with an interior angle perpendicularity tolerance of 0.13mm and an interior angle side length of 500mm x 400mm. Place the short side of the angle ruler against the board.

Place the short side of the board against the long side of the board, and use a feeler gauge to measure the maximum gap between the long side of the board and the long side of the square. Measure all four sides of the board.

Angle, expressed as the angular tolerance of the sheet metal, with the measurement of the maximum gap accurate to 0.1 mm.

7.1.9 Angle of the arc plate

Use a 90° steel angle ruler with an interior angle perpendicularity tolerance of 0.13mm and an interior angle side length of 500mm x 400mm. Place the short side of the angle ruler close to the circle.

On the end face of the curved plate, place the long side of a square against the edge of the curved plate, and use a feeler gauge to measure the maximum gap between the edge of the curved plate and the long side of the square. (Measure the circle...)

The angular tolerance of the arc plate is represented by the measured value of the maximum gap at the four corners, with the measurement accurate to 0.1 mm.

7.1.10 Angle between the front and side of a standard sheet

Using a 90° steel angle ruler with an interior angle perpendicularity tolerance of 0.13mm and an interior angle side length of 500mm x 400mm, place the short side of the angle ruler close to the decoration.

Place the long side of a square against the side and observe the position of the gap to determine the size of the included angle.

7.1.11 Angle alpha of the circular arc plate

Place the arc template against the decorative surface of the arc panel, ensuring that the extended radial scale line intersects the edge of the arc panel. Place a small ruler along the radial... Place the scale line on the arc template and measure the angle between the side of the arc plate and the small ruler (see Figure 5).

7.1.12 Specular gloss

The gloss meter with an incident angle of 60° and an aperture diameter of not less than 18 mm was used for testing in accordance with the provisions of GB/T 13891.

7.2 Appearance Quality

7.2.1 Pattern Color Tone

Place the protocol board and the board to be inspected side by side on the ground, and stand 1.5m away from the board for visual inspection.

7.2.2 Defects

Use a vernier caliper or other measuring instrument that meets the accuracy requirements to measure the length and width of the defect, with the measurement accurate to 0.1 mm.

7.3 Physical Properties

7.3.1 Lithofacies Analysis

The test methods are conducted according to Appendix A of GB/T 18601-2009, and the stone types are classified based on the main mineral components and structure.

7.3.2 Bulk density and water absorption rate

Test according to the provisions of GB/T 9966.3; when the specimen size specified in GB/T 9966.3 cannot be met, a representative plate should be used.

Prepare a 50mm x 50mm x plate thickness sample from the material product; the remaining procedures shall be carried out according to GB/T 9966.3. When using this method, it should be noted that... Specify the sample dimensions in the report.

7.3.3 Compressive Strength

Test according to the provisions of GB/T 9966.1; when the specimen size specified in GB/T 9966.1 cannot be met, a specimen with a size not smaller than [missing information] may be used.

The test should be conducted on a typical 20mmx20mmx20mm specimen, and this method should be noted in the report.

7.3.4 Bending strength

Test according to the provisions of GB/T 9966.2.

7.3.5 Abrasion resistance

Perform according to Method A in GB/T 9966.4.

8.1 Factory Inspection

8.1.1 Inspection Items

The inspection items include.

a) The roughened board is subject to thickness deviation, flatness tolerance, specular gloss, and appearance quality;

b) For standard plates, the specifications include dimensional deviations, flatness tolerances, angular tolerances, specular gloss, and appearance quality.

c) For the arc plate, the dimensional deviations, angle tolerances, straightness tolerances, line profile tolerances, and appearance quality are as follows.

d) For irregularly shaped panels, the processing quality items and appearance quality shall be determined by the supplier and the buyer through negotiation.

8.1.2 Batching

A batch of boards of the same variety, category, grade, and supply batch is considered as one batch, or boards from consecutive installation locations are considered as one batch.

8.1.3 Sampling

Samples were drawn according to Table 10.

8.1.4 Determination

If all the test results of a single board meet the corresponding grade in the technical requirements, then the board is deemed to meet that grade.

Based on the sample inspection results, if the number of nonconformities of grade 1 or higher found in the sample is less than or equal to the acceptance number (Ac), then the batch is deemed to be compliant.

If the number of nonconformities found in the sample is greater than or equal to the rejection number (Re), then the batch is deemed not to meet the grade.

8.2 Type Testing

8.2.1 Inspection Items

All inspection items shall be inspected in accordance with the provisions of Chapter 6.

8.2.2 Inspection conditions

Type testing shall be conducted under any of the following circumstances.

a) The new factory went into operation;

b) Significant changes have been made to raw materials and production processes;

c) During normal production, this is done once a year.

8.2.3 Batching

Same as factory inspection.

8.2.4 Sampling

Sampling for processing quality and appearance quality is the same as that for factory inspection; for other items, samples are randomly selected from the inspection batch to prepare double the number of samples.

8.2.5 Determination

If the test results for bulk density, water absorption, compressive strength, flexural strength, and abrasion resistance all meet the corresponding requirements in Chapter 6, then the product is deemed to be... If any of the above items in a batch of boards are qualified, then the batch of boards is deemed unqualified if two or more items fail to meet the corresponding requirements in Chapter 6; if any item fails to meet the requirements, then the batch of boards is deemed unqualified.

When the requirements of Chapter 6 are met, the item shall be re-inspected using a spare sample. If the re-inspection result is qualified, the above items of the batch of boards shall be deemed qualified; otherwise... If the result is negative, the batch of boards is deemed unqualified. The judgment of other test results is the same as that of the factory inspection.

9.1 Marking

9.1.1 The outer packaging of the sheet material shall indicate. the company name, trademark, and logo; […]