Domestic porcelain ware
1 Scope
This document specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of domestic porcelain ware.
This document is applicable to domestic fine porcelain, ordinary porcelain and stoneware products.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document(including any amendments) applies.
GB/T 2828.1-2012 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 2829-2002 Sampling procedures and tables for periodic inspection by attributes (apply to inspection of process stability)
GB/T 3295 Standard test method for 45° specular gloss of ceramic ware
GB/T 3298 Standard test method for crazing resistance of domestic ceramic ware by a thermal shock method
GB/T 3299 Test method for water absorption of domestic ceramic ware
GB/T 3300 Standard test method for deformation measurement of domestic ceramic ware
GB/T 3301 Standard method for measurement of volume, rim diameter allowance, height allowance, weight allowance and size of defects of domestic ceramic ware
GB/T 3302 Rules of package, mark, transport and reserve for domestic ceramic ware
GB/T 3303 Terminology of defects for domestic ceramics
GB/T 5000 Terminology for domestic ceramics
GB/T 27587 Test method for the resistance to microwave heating of domestic ceramic ware
GB/T 32680 Test method for mechanical dish washing resistance of domestic ceramic ware
GB/T 34253 Test method for resistance to freezer to microwave/oven usage on domestic ceramic wares
QB/T 1503 Test method for whiteness of domestic ceramics
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 5000 and GB/T 3303 apply.
4 Product classification
4.1 They are classified into dishes, bowls, cups, pots and other utensils by product use.
4.2 They are classified into small, medium, large and special types by product specification. See Table 1 for the dimension range of each type.
4.3 They are classified into fine porcelain, ordinary porcelain and stoneware by water absorption rate of products.
Table 1
Category Type
Small Medium Large Special
Dishes (rim diameter/mm) ＜128 128 to＜228 228 to 350 ＞350
Bowls (rim diameter/mm) ＜110 110 to＜175 175 to 250 ＞250
Cups (rim diameter / m) ＜60 60 to＜100 100 to 140 ＞140
Pots (capacity/mL) ＜250 250 to＜1000 1000 to 2400 ＞2400
Other utensils Depending on the maximum dimension and the similarity of their shape, they are shaped according to the above-mentioned types respectively.
5 Technical requirements
5.1 Water absorption
Water absorption of fine porcelain products, ordinary porcelain products and stoneware products shall be no more than 0.5%, 1.0% and 5.0% respectively.
5.2 Thermal shock resistance
Small and medium products shall not crack after heat exchange from 180°C to 20°C； large and special products shall not crack after heat exchange from 160 °C to 20 °C
5.3 Whiteness, gloss and color difference
They shall be as specified in Table 2.
Table 2
Item Grade
Superior product Grade I product Acceptable product
Whiteness of white porcelain ≥70.0 ≥60.0 ≥55.0
Glaze gloss (except matte glaze and matte glaze products) ≥85.0 ≥80.0
Glaze color difference ≤1.0 ≤2.0 ≤3.0
5.4 Microwave oven adaptability
The heating energy is 72,000 J, and it shall not crack, damage or arc after being tested according to 6.4.
5.5 Refrigerator-to-microwave adaptability
After being tested according to 6.5, it shall be free of crack, damage and arc.
5.6 Refrigerator-to-oven adaptability
After being tested according to 6.6, it shall be crack-free and damage-free.
5.7 Mechanical washing resistance
The average obtained by all observers shall not be greater than 1.
5.8 Product specification error
5.8.1 Rim diameter error
