JY/T 0446-2011Glass instruments for teaching (English PDF)

3.1 Product Classification

Divided into five types. phi 15 x 150mm, phi 20 x.200mm, phi 20 x 250mm, phi 25 x 250mm, phi 25 x 300mm specification.

3.2 Model designation

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

The designation of the rigid glass tube is.

L - YBG - Z - 15 x 150 Product specifications, unit. mm Product feature code, straight Product name Pinyin prefix, rigid glass tube Product model classification code, glass instrument Model example.

L-YBG-Z-20 x.200. Straight rigid glass tube with diameter and length phi 20mm x.200mm.

4.1 Materials

It should be made of colorless transparent borosilicate glass, and the average linear thermal expansion coefficient should be less than 3.4 x 10-6K-1.

4.2 Dimensions

The external dimensions and tolerances of various specifications of rigid glass tubes shall conform to Table 1 and Figure 1.

Table 1 Dimensions and tolerances in millimeters

Part name code

Specifications and tolerances phi 15 x 150 phi 20 x.200 phi 20 x 250 phi 25 x 250 phi 25 x 300 Tube outer diameter D 15 ± 1 20 ± 1 20 ± 1 25 ± 1.5 25 ± 1.5 L 150 ± 5.200 ± 5 250 ± 5 250 ± 5 300 ± 7 Wall thickness S 1 ± 0.3 1.2 ± 0.3 1.2 ± 0.3 1.2 ± 0.3 1.2 ± 0.3

Figure 1 rigid glass tube

4.3 Appearance

4.3.1 The appearance defects allowed are to comply with Table 2.

Table 2 Permitted appearance defects

Nodular calculi

Nodules and stones

Allowed total

Gas line single stripe Width <=1mm, <= 2 widths <= 0.5mm, <= 2 <= 3 widths <= 0.3mm, <= 2 pieces scattered, <= 2

4.3.2 The appearance defects that should not exist shall be in accordance with 4.1.1.2 of JY 0423-2011.

4.3.3 Both ends of the test tube shall be rolled.

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

The thermal shock should not be lower than.200 ° 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 for factory inspection and type inspection shall comply with Table 3.

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

No. Inspection Content Defect Classification Factory Inspection Type Inspection

1 Geometry and fit

1.1 Dimensions (except wall thickness) 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 Average linear thermal expansion coefficient B--

3.4 Chemical stability B--

4 Material A--

5 Environmental test

5.1 Stacking Code B--

5.2 Vibration A--

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

No. Inspection Content Defect Classification Factory Inspection Type Inspection

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 a normal sampling once. The inspection level 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 be in accordance with Table 4. Defects B and C in the table are allowed to coexist.

Table 4 Single sample determination rules

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

6.4.3 The quality of the inspection batch shall be determined in accordance with GB/T 2828.1-2003, with a normal sampling once inspection plan, AQL value. internal stress, thermal shock the coefficient of linearity and average thermal expansion is 1.5, the external dimensions are 6.5, and the rest are 2.5.

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