JY/T 0441-2011Teaching glass instruments with test tubes (English PDF)

3.1 Product Classification

Divided into different specifications according to diameter and length, according to the position of the branch tube is divided into mouth with branch test tube and bottom with branch test tube.

3.2 Model designation

The model name of the product should comply with the provisions of JY 0026-1991.

Models with test tubes are named.

L - JZG - K/D - 15 x 150 Product specifications (diameter x length), unit. mm Product feature code, with mouth support/bottom support Product name Pinyin prefix with test tube Product model classification code, glass instrument Model example.

L-JZG-K-15 x 150. Supported test tube with mouth size of 15mm x 150mm.

4.1 Materials

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

4.2 Dimensions

The external dimensions and tolerances of the test tubes with various specifications at the mouth should conform to Table 1, Figure 1, and the specifications and appearance of the test tubes with various specifications at the bottom Dimensions and tolerances should conform to Table 2 and Figure 2.

Table 1 Dimensions and tolerances of test tubes with various specifications for mouth

No. Specifications Test tube length L Tube outer diameter D Branch tube outer diameter D1 Branch tube length l1 Branch to nozzle Distance l2 Wall thickness S 1 phi 15 x 150 150 ± 5.0 15 ± 1.0 8 ± 1.0 35 ± 5.0 18 ± 3.0 >=0.8 2 phi 18 x 150 150 ± 5.0 18 ± 1.0 8 ± 1.0 35 ± 5.0 22 ± 3.0 >=0.9 3 phi 21 x 180 180 ± 5.0 21 ± 1.0 8 ± 1.0 35 ± 5.0 25 ± 3.0 >=1.0 4 phi 25 x.200.200 ± 5.0 25 ± 1.5 8 ± 1.0 40 ± 5.0 30 ± 3.0 >=1.0 5 phi 32 x.200.200 ± 5.0 32 ± 2.0 8 ± 1.0 40 ± 5.0 38 ± 3.0 >=1.2

Table 2 Dimensions and tolerances of test tubes with various specifications at the bottom in millimeters

No. Specifications Test tube length L Test tube outer diameter D Branch tube outer diameter D1 Branch tube length l1 Wall thickness S 1 phi 18 x 150 150 ± 5.0 18 ± 1.0 8 ± 1.0 40 ± 5.0 >=0.9 2 phi 21 x 180 180 ± 5.0 21 ± 1.0 8 ± 1.0 45 ± 5.0 >=1.0 3 phi 25 x.200.200 ± 5.0 25 ± 1.5 8 ± 1.0 50 ± 5.0 >=1.0

Figure 1 Test tube with mouth

Figure 2 Test tube at the bottom

4.3 Appearance

4.3.1 The appearance defects allowed are to comply with B.7 of Appendix B of JY/T 0423-2011.

4.3.2 The appearance defects that should not exist shall be in accordance with JY/T 0423-2011 Section 5.1.1.

4.3.3 Oral treatment should comply with JY/T 0423-2011 Section 5.3.

4.3.4 The thickness of the bottom of the pipe shall be uniform, and the thickness difference shall not be greater than 0.2mm, and shall comply with Article 5.4 of JY/T 0423-2011.

4.3.5 The branch pipe connection should be smooth and firm, and should not be skewed.

4.4 Chemical stability

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

4.5 Internal stress

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

4.6 Thermal shock

Thermal shock should not be lower than 180 °C

4.7 Environmental test

The environmental test shall be in accordance with Chapter 8 of JY/T 0423-2011.

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 inspection methods

The inspection items and inspection methods of this product shall conform to Table 3.

Table 3 Inspection items, inspection methods and defect classification

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 Processing C -

3 Physical and chemical properties

3.1 Internal stress A -

3.2 Thermal shock A -

3.3 Chemical stability B--

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, and the inspection plan shall be taken once for normal sampling, and the water shall be inspected.

Ping is 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 conform to Table 4. Defects B and C in the table are allowed to coexist.

Table 4 Single item judgment rules

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

Should follow 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 item" pictogram in accordance with the provisions of GB 191-2008.