S.I. No. 158/1949:

STANDARD SPECIFICATION (LIQUID DRIERS FOR PAINTS) ORDER, 1949.

STANDARD SPECIFICATION (LIQUID DRIERS FOR PAINTS) ORDER, 1949.

I, DANIEL MORRISSEY, Minister for Industry and Commerce, in exercise of the power conferred on me by subsection (3) of section 20 of the Industrial Research and Standards Act, 1946 (No. 25 of 1946), hereby order as follows :

1. This Order may be cited as the Standard Specification (Liquid Driers for Paints) Order, 1949.

2.--(1) The specification set forth in Part II of the Schedule to this Order is hereby declared to be the standard specification for the commodity described in Part I of the said Schedule.

(2) The said standard specification may be cited as Irish Standard 15 : 1949.

SCHEDULE.

PART I.

LIQUID DRIERS FOR PAINTS.

PART II.

SPECIFICATION.

In this specification, the letters I.S., when followed by two sets of numbers, refer to the Irish Standard of which the first is the serial number and the second the year of its promulgation by the Minister for Industry and Commerce.

In this specification, the letters B.S., when followed by two sets of numbers, refer to the British Standard of which the first is the serial number and the second is the year of its publication by the British Standards Institution.

SCOPE.

1. This specification applies to liquid driers suitable for use in paints.

A liquid drier shall consist of a solution in a suitable solvent of a reagent which promotes the drying of paints.

SOLVENT.

2. The solvent shall be turpentine type 1, conforming to I.S. 12 : 1949, and/or white spirit conforming to I.S. 11 : 1949.

STORAGE AND SEDIMENTATION.

3. Liquid driers shall be clear and free from deposit after being kept in the dark in a closed container for seven days at a temperature of 15° C. to 20° C.

Liquid driers adjusted if necessary by addition of the solvent to a volatile content of 80 per cent., shall not show separation or deposit when mixed as described at (a) and (b) below, and allowed to stand for six hours at a temperature of 15° C. to 20° C.

(a) One volume of the liquid drier to 20 volumes of filtered raw linseed oil conforming to I.S. 14 : 1949.

(b) One volume of the liquid drier to 20 volumes of a mixture consisting of four parts by volume of filtered raw linseed oil conforming to I.S. 14 : 1949 to one part of white spirit conforming to I.S. 11 : 1949.

COLOUR.

4. The liquid drier shall be not darker in colour than the agreed sample if any.

For the purpose of comparison of colour, the liquid drier and the agreed sample shall be placed in similar glass tubes 1 centimetre in diameter and 10 centimetres long and viewed transversely by transmitted light.

The colour of a dried film of zinc oxide paint which includes the liquid drier as drier shall, after twenty-four hours be not darker than that of a similar film which includes the agreed sample as drier. The composition of the paints and the manner of comparing the colours shall be as given in Appendix A.

VOLATILE CONTENT.

5. The volatile content of the liquid drier when determined in the manner described in Appendix B shall not exceed 80 per cent.

FLASH POINT.

6. The flash point of the liquid drier determined by Abel's closed test, shall be not below 78° F.

THICKENING.

7. A zinc oxide paint of the composition given in Appendix A shall not thicken when kept for seven days in a closed container at a temperature of 15° C. to 20° C.

DRYING.

8. A film of zinc oxide paint, which includes the liquid drier as drier, shall not become surface dry in less than 8 hours and shall become hard dry in not more than 24 hours. The paint shall have the composition given in Appendix A and the test shall be carried out as described in Appendix C.

For the purpose of this clause the term " surface dry " shall mean a condition such that clean dry silver sand sprinkled on to the surface of the paint film and kept there for one minute, can be removed by means of a camel-hair brush without injury to the paint film. The sand used shall be graded so as to pass a No. 44 British Standard Test Sieve conforming to B.S. 410 : 1943, but to be retained on a No. 100 British Standard Test Sieve conforming to B.S. 410 : 1943.

For the purpose of this clause the term " hard dry " shall mean a condition such that after slight rubbing down a second coat of the paint can be satisfactorily applied.

KEEPING QUALITIES.

9. Liquid driers when stored in the original filled and sealed opaque containers shall conform to the provisions of this specification for a period to be agreed between the Purchaser and the Vendor.

SAMPLING AND SIZE OF SAMPLE.

10. Representative samples, each measuring not less than 1 imperial pint, shall be taken in triplicate from one or more original and previously unopened containers, or from the bulk during filling. They shall be packed in clean dry air-tight non-absorbent containers made of material on which the sample has no action. The containers shall be of a size such that they are nearly filled by the sample. Each container so filled shall be sealed and shall be marked with the date of sampling, and with sufficient information to identify the sample.

AGREED SAMPLE.

11. Except where otherwise agreed between the Purchaser and the Vendor, the agreed sample referred to in this specification shall comply in all respects with the requirements of this specification. The sample shall measure not less than 1 imperial pint and shall be packed in the manner described in Clause 10.

APPENDIX A.

Method for the Comparison of Colour.

The paint used shall have the following composition :

60 parts by weight of zinc oxide type 1 grade L, conforming to B.S. 254 : 1935.

34 parts by weight of raw linseed oil conforming to I.S. 14 : 1949.

6 parts by weight of the liquid drier adjusted if necessary by addition of the solvent to a volatile content of 80 per cent.

The paints to be compared shall be brushed out in the same direction in alternate opaque strips on a clear colourless glass plate. The strips shall be not less than ¾-inch wide and shall have touching edges of not less than 1½-inches. The comparison shall be made in diffused daylight immediately after application of the paint.

APPENDIX B.

Method for the Determination of Volatile Content.

One to two g. of the liquid drier shall be weighed into a flat-bottomed circular dish about 3 in. in diameter and 1 in. in internal depth. The dish and contents shall be heated for one hour on a steam bath and thereafter for two hours in a suitable oven at 110° C. The dish shall then be allowed to cool to air temperature and be re-weighed. The percentage loss in weight shall be regarded as the volatile content.

APPENDIX C.

Method for the Determination of Drying.

The paint shall be brushed out on a non-absorbent surface 6-inches square so as to produce a uniform film. The film shall be placed in a vertical position in a well ventilated room so as to expose the film to diffused daylight for at least six hours during each day of the drying period. During the drying period the temperature of the room shall be between 15° C. and 20° C., and shall be above the dew point.

GIVEN under my Official Seal this 23rd day of December, 1949.

DANIEL MORRISSEY,

Minister for Industry and Commerce