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JC/T 779-2010 English PDF (JCT779-2010)

JC/T 779-2010 English PDF (JCT779-2010)

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JC/T 779-2010: Glass fibre reinforced plastics baths

This Standard specifies the product structure, classification and sign, requirements, test methods, inspection rules, markings, packaging, transportation, and storage of glass fibre reinforced plastic baths. This Standard is applicable to glass fibre reinforced plastic bathtubs with various moulding processes.
JC/T 779-2010
JC
BUILDING MATERIALS INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 83.120
Q 23
Record No.: 30069-2011
Replacing JC/T 779-2000
Glass Fibre Reinforced Plastics Baths
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ISSUED ON: NOVEMBER 22, 2010
IMPLEMENTED ON: MARCH 01, 2011
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Product Structure, Classification and Sign ... 5
5 Raw Materials ... 6
6 Requirements ... 7
7 Test Method ... 9
8 Inspection Rules ... 11
9 Marking, Packaging, Transportation and Storage ... 12
Appendix A (Normative) Test Methods of Load Resistance ... 13
Appendix B (Normative) Test Methods of Hot Water Resistance ... 16
Appendix C (Informative) Bathtub Protection ... 17
Glass Fibre Reinforced Plastics Baths
1 Scope
This Standard specifies the product structure, classification and sign, requirements, test methods, inspection rules, markings, packaging, transportation, and storage of glass fibre reinforced plastic baths (hereinafter referred to as bathtubs). This Standard is applicable to glass fibre reinforced plastic bathtubs with various moulding processes.
2 Normative References
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this document.
GB/T 1462 Test Methods for Water Absorption of Fibre Reinforced Plastics GB/T 2828.1 Sampling Procedures for Inspection by Attributes ?€? Part 1: Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-Lot Inspection GB/T 3854 Test Method for hardness of Reinforced Plastics by Means of a Barcol Impresser
GB/T 3961 Terms for Fibre Reinforced Plastics
GB/T 8237 Liquid Unsaturated Polyester Resin for Fibre Reinforced Plastics GB/T 11942 Colorimetric Methods for Colour Building Materials
GB/T 17470 Glass Fibre Mats ?€? Chopped Strand and Continuous Filament Mats GB/T 18369 Glass Fibre Roving
GB/T 18370 Glass Fibre Woven Roving
JC/T 858 Specification for Cast Acrylic Sheet for Baths and Shower Trays for Domestic Purpose
5 ?€? overflow hole;
6 ?€? back.
Figure 1 -- Structural Schematic Diagram of the Bathtub
4.2 Product classification
Bathtubs are divided into gel coat type bathtubs (indicated by B) and acrylic bathtubs (indicated by Y).
4.3 Product sign
Bathtubs are signed by classification, maximum length, and standard number. Example:
The max. length is 1300mm, the acrylic bathtubs produced according to JC/T 779-2010 are signed as follows:
Y - 1300 - JC/T 779-2010
5 Raw Materials
5.1 Acrylic sheet
Acrylic sheets for bathtubs shall comply with the provisions of JC/T 858. 5.2 Resin
The gel coat resin shall comply with the provisions of the heat-resistant type specified in GB/T 8237; the resin shall comply with the provisions of GB/T 8237.
5.3 Reinforced materials
Glass fibre chopped strand mats and continuous filament mats shall comply with the provisions of GB/T 17470; glass fibre roving for spray moulding shall comply with the provisions of GB/T 18369; glass fibre woven roving shall comply with the provisions of GB/T 18370.
Max. length,
Classification
Table 3 -- Length Deviation of the Bathtub Unit: mm
6.3 Resistance to daily chemicals
After the test according to 7.4, the bathtub shall be free from permanent pollution and damage.
6.4 Pollution resistance
The colour difference ??E on the surface of the test panel before and after the test shall be no greater than 3.5.
6.5 Barcol hardness
The Barcol hardness of the acrylic bathtub shall be no less than 40; the Barcol hardness of the gel coat type bathtub shall be no less than 35.
6.6 Water absorption rate
The water absorption rate of the gel coat type bathtub shall be no greater than 0.5%. 6.7 Load resistance
After the test according to 7.8, there shall be no cracks or peeling on the surface of the bathtub; and no defects affecting the use on the back.
6.8 Impact resistance
After the test according to 7.9, the bathtub shall have no cracks or other obvious damage.
6.9 Hot water resistance
After the test according to 7.10, there shall be no more than 5 small cracks on the surface of the bathtub, no more than 10 bubbles; thereof, no more than 5 large bubbles; and there shall be no obvious discoloration or fading.
NOTE: Small cracks: the crack length is less than 5mm; large bubbles: the maximum diameter of the bubbles is 15mm.
6.10 Full-water deformation
After the test according to 7.11, the deformation at the bottom of the drain outlet is less Length Permissible deviation
tape with a minimum graduation of 1mm.
7.4 Resistance to daily chemicals
According to the provisions of JC/T 858. For each reagent, cut two specimens from the flat part of the bathtub or take a whole bathtub.
7.5 Pollution resistance
Use black shoe polish as a pollutant; and the test shall be carried out in accordance with the provisions of GB/T 11942.
7.6 Barcol hardness
According to the provisions of GB/T 3854.
7.7 Water absorption rate
Carry out in accordance with the provisions of GB/T 1462.
7.8 Load resistance test
See Appendix A for the test method.
7.9 Impact resistance
Place the bathtub on the support shown in Figure A.1; and use a steel ball with a diameter of 30mm and a mass of (112??1) g above the approximate centre of the bottom of the bathtub. Fall freely from the height of 2m; and conduct a chalk test at the place where the steel ball impacts.
NOTE: The chalk test is to dip gauze with coloured chalk powder that is different from the colour of the bathtub; and evenly apply it to the inspected position of the bathtub; then wipe it off with a clean gauze; finally check whether there are cracks and peelings. 7.10 Hot water resistance
See Appendix B for test method.
7.11 Full-water deformation
Place the bathtub on the support shown in Figure A.1; keep the upper edge horizontal. Install a dial indicator on each measuring point; and then slowly pour water to 10mm from the upper edge of the bathtub; keep it for 3min. And measure the deflection at the bottom drain outlet and the longitudinal deflection at 4 points in the horizontal centre of the upper edge surface. The deflection of the upper edge surface is the largest absolute value among 4 points.
8.3.3 Sampling and judgment
8.3.3.1 Judgment of a single product
If all items meet the corresponding requirements, the product is judged to be qualified; otherwise, it is unqualified.
8.3.3.2 Batching and sampling
a) A batch of products produced continuously by the same material, the same process and the same conditions.
b) According to the provisions of GB/T 2828.1, one sampling plan is adopted by normal inspection; the inspection level is Level-II; and the acceptance quality limit (AQL) is 4.0.
9 Marking, Packaging, Transportation and Storage
9.1 Marking
Attach a firm mark to the appropriate position of the bathtub, which includes the contents such as product name, manufacturer name, factory address, trademark, mark, production date, etc.
9.2 Packaging
Appropriate packaging shall be used to avoid damage to the bathtub due to improper packaging.
9.3 Transportation
During transportation, it is necessary to ensure that the bathtub is not bumped or corroded by chemical corrosive chemicals.
9.4 Storage
The bathtub may be stacked, but the height may not exceed 2m.
9.5 Accompanying documents of the product
Including: product certificate, product instruction manual, installation drawing and other related technical documents.
9.6 Protection
See Appendix C for bathtub protection.
Appendix B
(Normative)
Test Methods of Hot Water Resistance
B.1 Apparatus
B.1.1 Bathtub boiling tester
B.1.1.1 Automatic control device, the accuracy of the control instrument is ??1??C; B.1.1.2 The control system shall be equipped with a stirring device to ensure uniform water temperature in the bathtub;
B.1.1.3 The control device shall be checked regularly to ensure the accuracy of temperature control.
B.1.2 Rod precision mercury thermometer
B.2 Test procedures
B.2.1 Place the bathtub on the platform and add water to more than 80% of the depth of the bathtub.
B.2.2 Gel coat type bathtub: Raise the water temperature to 90??C; keep the temperature at (90??2) ??C and boil it for 100h. At the same time replenish water in a proper way to keep the water level above 80% of the bathtub.
Acrylic bathtub: Raise the water temperature to 80??C; keep the temperature at (80??2) ??C and boil it for 100h. At the same time replenish water in a proper way to keep the water level above 80% of the bathtub.
B.2.3 Drain the water immediately after boiling; and then place it to room temperature. B.2.4 Check the bathtub for obvious signs of damage, discoloration, fading and other defects that damage the surface performance of the bathtub.

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