JC/T 779-2010 English PDF (JC/T779-2010)

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JC/T 779-2010: Glass fibre reinforced plastics baths
JC/T 779-2010
JC
BUILDING MATERIALS INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 83.120
Q 23
Record No.: 30069-2011
Replacing JC/T 779-2000
Glass Fibre Reinforced Plastics Baths
玻璃纤维增强塑料浴缸
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 ΔE 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 ...