JY/T 0442-2011Teaching glass instrument curved neck (English PDF)

3.1 Product Classification

It is divided into three specifications of 125mL, 250mL, and 500mL according to the capacity of curved neck crest, and it is divided into cramped crested neck and cramped crested neck by type.

3.2 Model designation

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

The model of curved neck jacket is named.

L - QJZ - JS/WS - 125 Product specifications (capacity), unit. mL Product feature code, plugged/unplugged Product name Pinyin prefix, curved neck Product model classification code, glass instrument Model example.

L-QJZ-WS-125. 125 mL non-plugged curved neck scapula.

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 Dimensions

The external dimensions and tolerances of various specifications of curved neck collars are shown in Table 1. The non-plugged curved neck collars should conform to Figure 1. The plugged curved neck collars should conform to Figure 2.

Table 1 Specifications, dimensions and deviations

Part code

Specification, size and deviation mm 125mL 250mL 500mL Ball outer diameter D 1 70 ± 5 86 ± 5 105 ± 8 Caliber D 2 12 ± 3 14 ± 3 18 ± 3 Handle length L.200 ± 10 225 ± 10 300 ± 15 Ball wall thickness S > 1.2 > 1.5 > 1.5

Figure 1 Non-plugged curved neck

Fig. 2 Necked with constriction

4.3 Appearance

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

Table 2 Permitted appearance defects

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 The frosted surface with plug should be uniform and cover the frosted area regularly, and the area should be not less than 92% of the frosted area.

4.3.4 Oral treatment should comply with Article 5.3 of JY/T 0423-2011.

4.3.5 The wall thickness ratio should not be greater than 3. 2.

4.4 Adhesiveness

Should meet the second level of tightness.

4.5 Internal stress

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

4.6 Chemical stability

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

4.7 Thermal shock

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

4.8 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

6.3 Lot rules and sampling methods

No. Inspection Content Defect Classification Factory Inspection Type Inspection

1 Geometry and fit

1.1 Wall thickness B -

1.2 Frosting Requirements A -

1.3 Adhesion A -

2 appearance requirements

2.1 Appearance defect B -

2.2 Color C -

2.3 Oral Processing C -

2.4 Bottom B -

3 Physical and chemical properties and materials

3.1 Internal stress A -

3.3 Thermal shock A -

3.4 Average linear thermal expansion coefficient B--

3.5 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.

6.3.1 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 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

According to JY 0001-2003 Chapter 11.

7.2 Packaging, transportation and storage

7.2.1 It shall be as specified in 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.