JC/T 779-2010Glass Fibre Reinforced Plastics Baths (English PDF)

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

5.1 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 deltaE 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.

9.1 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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