JY/T 0430-2011Teaching glassware (English PDF)

3.1 Product Classification

Divided into phi25mm, phi35mm, phi45mm, phi60mm, phi80mm, phi90mm, phi100mm, phi120mm, phi150mm, Ten specifications of phi 180mm.

3.2 Model Nomenclature

The model name of the product is in accordance with the provisions of JY 0026-1991.

The model name of the watch glass is.

L - BMM - Y - 25

Product specifications (outer diameter), unit. mm Product feature code, round Product name Pinyin prefix, watch glass Product model classification code, glass instrument Model example.

L-BMM-Y-60. Round watch glass with outer diameter phi 60mm.

4.1 Materials

It should be made of colorless transparent borosilicate glass with an average linear thermal expansion coefficient of not more than 4.0 x 10-6K-1.

4.2 Specifications

Specifications, dimensions and tolerances shall conform to Table 1 and Figure 1.

Table 1 Dimensions and tolerances in millimeters

Part

name

Specifications and tolerances phi 25 phi 35 phi 45 phi 60 phi 80 phi 90 phi 100 phi 120 phi 150 phi 180

1 Dish diameter D 25 ± 2 35 ± 2 45 ± 3 60 ± 3 80 ± 3 90 ± 3 100 ± 4 120 ± 5 150 ± 5 180 ± 5 Dish surface Curvature radius R 40 ± 3 50 ± 3 60 ± 3 60 ± 3 75 ± 3 105 ± 5 105 ± 5 135 ± 5 160 ± 5 160 ± 5

Figure 1 Watch glass

4.3 Appearance

The allowed appearance defects are shown in Table 2.

Table 2 Permitted appearance defects

Serial number defect Specifications phi 25 ~ phi 60 Specifications phi 80 ~ phi 120 Specifications phi 150 ~ phi 180 Maximum diameter mm Quantity Maximum diameter mm Quantity Maximum diameter mm Quantity 1 bubble 2 3 3 3 4 3 2 nodules 1 2 1 3 1 4

3 Stones 0.5 1 0.8 1 1 1 Air bubbles, nodules, stones Allowed total-<=4-<=5-<=6 5 2 stripes, should not be concentrated 6 maximum diameter of chipping notch <= 1mm, 1

4.4 The appearance defect that should not exist should conform to JY/T 0423-2011 Section 5.1.1.

4.5 Dish Mouth

The mouth of the dish should be smoothed and polished.

4.6 Wall thickness uniformity

The thickness ratio should not be greater than 5. 2.

4.7 Internal stress

The internal stress should not be greater than 180 nm/cm.

4.8 Chemical stability

Should meet water resistance HGB level 1, acid resistance H1 level, alkali resistance A2 level.

4.9 Thermal shock

The thermal shock resistance (quenching temperature difference) should not be lower than 180 ° C.

4.10 Environmental test items

Should be in accordance with JY/T 0423-2011 Chapter 8.

6.1 Inspection classification

The inspection of this product is divided into factory inspection, type test and quality supervision inspection.

6.2 Inspection items and methods

The inspection items and inspection methods for factory inspection and type inspection shall comply with Table 3.

Table 3 Inspection items and inspection methods for defect classification, factory inspection and type inspection

No. Inspection Content Defect Classification Factory Inspection Type Inspection

1 Geometry and fit

1.1 Dimension A -

1.2 Wall thickness B -2 appearance requirements

2.1 Appearance defect B -

2.2 Color C -

2.3 Oral treatment B -

3 Physical and chemical properties

3.1 Internal stress A -

3.3 Chemical stability B--

3.4 Thermal shock resistance A -

4 Material A--

5 Environmental test

5.1 Stacking Code B--

5.2 Vibration A--

5.3 Free fall A--

Note. "-" in the table means full inspection for batch products, "-" means sample inspection for batch products, and "-" means no inspection.

6.3 Lot rules and sampling methods

6.3.1 The factory inspection shall be based on the natural batch of delivery, and the type inspection shall be based on the inventory array.

6.3.2 When leaving the factory, all the inspection items should be inspected first, and then samples should be taken from the qualified products of all inspection items.

test.

6.3.3 The samples for type inspection shall be taken from the products that passed the factory inspection.

6.3.4 The sampling methods for factory inspection and type inspection shall be in accordance with GB/T 2828.1-2003, with a normal sampling once inspection plan and inspection level.

For General II.

6.4 Non-conformance determination

6.4.1 The classification of defects A, B and C shall conform to Table 3.

6.4.2 The criteria for a single sample shall be in accordance with Table 4. B defects and C defects are allowed to coexist.

Table 4 Single sample determination rules

Classification A defect B defect C defect Pass 0 <= 2 <= 4 Failed > 1 > 2 > 4

6.4.3 The quality of the inspection lot shall be determined in accordance with GB/T 2828.1-2003, a normal sampling once inspection plan, AQL value. internal stress and thermal shock Take 1.5 for performance, 6.5 for external dimensions, and 2.5 for the rest.

6.5 Review rules

The re-inspection shall implement the transfer rules in accordance with GB/T 2828.1-2003.

6.6 Quality supervision inspection

Press JY 0002.

7.1 Signs

Should comply with the provisions of Chapter 11 of JY 0001-2003.

7.2 Packaging, transportation and storage

7.2.1 It shall comply with the provisions of Chapter 12 of JY 0001-2003.

7.2.2 The products shall be separated by earthquake-resistant packaging materials and fixed in the packing box.

7.2.3 The outer packaging box shall be provided with a "fragile article" pictogram in accordance with GB 191-2008.