Chemical resistance and stain resistance test- for tile & stones

IS 13630 (Part 8) standard is actual for ceramic tiles, but QC engineers are using this for many types of tiles & stones and also using the chemical or liquid which are suspected to drop. This can be performed at site level also. Let us see, how to do this test:

Chemical used for this test:

1. Stains

a) Methylene Blue, 10 g/l,

b) Potassium Permanganate Solution, 10 g/l.

2 Household Chemicals

a) Ammonium Chloride Solution, 100gil;

b) Standard cleaning agent solution, prepared from:

1) Anhydrous sodium 33 percent(m/m) carbonate

2) Sodium perborate 7 percent(mint)

3) Sodium silicate solution 7 percent(m/m) of density 1.33 g/cm3

4) Commercial sodium 30 percent(m/m) oleate soap flakes

5) Distilled water or 23 percent(m/m) de-ionized water

c) 100 g of this standard cleaning agent contains 70 g of dry substance. Use in a concentration of 109drysubstance per litre. The test solution shall be prepared immediately before use.

3 Swimming Pool Salts

a) Sodium hypochlorite solution 20 mg/l, prepared from technical grade hypochlorite with about 13 percent active chlorine.

b) Copper sulphate solution, 20 mg/l.

4 Acids

a) Hydrochloric Acid Solution, 3 percent (v/v) prepared from concentrated sulphuric acid (d~ 1.19); and

b) Citric Acid Solution, 100gil.

5 Alkali

a)       Potassium hydroxide solution200 g/l.

Pencil Test

Draw several lines with an HB pencil surface of tile & stone, wipe it and observe for it’s stain.

3 PRINCIPLES of testing

     A.      For testing the resistance to staining, the test solutions can be drop on dry tile & stone approximately 30 mm diameter, allow it for 24 Hrs, clean it and then the test surfaces are inspected for visual changes.

    B.      For testing the resistance to house hold chemicals, swimming pool salts and citric acid, wait for 6 hrs and then inspected for visual changes.  Pour the test solution through the inlet to a height of 20 ± I mm maintain the test assembly.

    C.      For testing the resistance to hydrochloric acid and potassium hydroxide the procedure is similar except that the period of test is 7 days

Classification of result:

Means, AA = no visible effect, A = slight change in appearance, B = a definite change in appearance, C = partial loss of the original surface, and D = total loss of the original surface.

For the resistance of stain:

If it is required to test the sealers, apply the sealer coat as per manufacturer specifications and test it.

Many thanks to google.com, 3434doc.com, archive99.in from where the details are taken.