Enameled bathtub
1 Scope
This standard specifies product classification and designation, requirements, test methods, inspection rules, marking, packaging, transportation and storage of enameled bathtub.
This standard is applicable to enameled cast iron bathtubs and enameled formed steel bathtubs.
2 Normative references
The following documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments to (excluding corrections), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document applies.
GB/T 4956 Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method
GB/T 7410 Terms of vitreous and porcelain enamels
GB/T 9988-1988 Test method for alkali resistance of porcelain enamels
GB/T 9989 Vitreous and porcelain enamels - Determination of resistance to citric acid at room temperature
GB/T 11420-1989 Measurement of specular gloss of vitreous and porcelain enamels
QB/T 1855 Enameled ware non-contact with food
3 Definitions
For the purposes of this standard, the definitions given in GB/T 7410 and the followings apply. See Figure 1.
3.1 top edge
uppermost flat part of a bathtub
3.2 apron board
a part of bathtub that is specially arranged to cover the underside of bathtub, which begins to sag from the top edge
3.3 drain outlet
a hole for draining water from bathtub
3.4 overflow
a water outlet arranged at the top of the inside of a bathtub to prevent overflow from the top edge
3.5 visible surface
the surface, after installation, is visible to eye
3.6 invisible surface
the surface, after installation, is not visible to eye
3.7 bottom surface
visible surface at the bathtub bottom
3.8 insulating layer
a layer of insulation over the invisible surface of bathtub
3.9 inspection window
a ring, with an inner diameter of 76 mm and made of a flexible material (such as paper or rubber sheet), to facilitate the determination of the number of defects within a specified area in the appearance test. The ring can also determine the scope of inspection on irregular surfaces.
Foreword II
1 Scope
2 Normative references
3 Definitions
4 Product classification and designation
5 Requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, transportation and storage
