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IS 3972-1-1 (1982): Methods of test for vitreousenamelware, Part 1: Production of specimens for testing,Section 1: Enameled sheet steel [CHD 9: Ceramicware]

Indian Standard METHODS OF TEST FOR

VITREOUS ENAMELWARE PART 1 PRODUCTION OF SPECIMENS FOR TESTING

Section 1 Enamelled Sheet Steel

( First Revision )

UDC 666.293.12.620.1l5

© Copyright 1983

I N D I A N S T A N D A R D S I N S T I T U T I O N MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Gr 2 June 1983

IS : 3972 ( Part 1/Sec 1 ) - 1982

AMENDMENT NO. 1 JANUARY 2006 TO

IS 3972 ( PART 1/SEC 1 ) : 1982 METHODS OF TEST FOR VITREOUS ENAMELWARE

PART 1 PRODUCTION OF SPECIMENS FOR TESTING

Section 1 Enamelled Sheet Steel

( First Revision )

( Page 5, clause 4.3.1, line 4 ) — Substitute '[ see IS 3972 ( Part 2/Sec 2 ) : 1985*]' for '[ see IS : 3972 ( Part II )*]'.

( Page 5, footnote marked '* ' ) — Substitute the following for the existing: '*Methods of test for vitreous enamelware : Part 2 Test methods. Section 2 Low and high voltage tests for detecting and locating defects ( first revision ).'

( CHD 9 )

Reprography Unit, BIS, New Delhi, India

IS : 3972 (Part I/Sec 1) - 1982

© Copyright 1983 INDIAN STANDARDS INSTITUTION

This publication is protected under the Indian Copyright Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act.

Indian Standard METHODS OF TEST FOR

VITREOUS ENAMELWARE PART I PRODUCTION OF SPECIMENS FOR TESTING

Section I Enamelled Sheet Steel

( First Revision )

Ceramicware Sectional Committee, CDC 27

Chairman DR B. N. SAMADDAR

Members DR S. K. BANERJEE

KM BANANI BARDHAN MAJ R. N. BASU SHRI G. K. BHAGAT SHRI K. K. BHATIA

Representing College of Ceramic Technology, Calcutta

Directorate of Industries, Government of West Bengal, Calcutta

Geological Survey of India, Calcutta Ministry of Defence ( DGAFMS ) Bengal Potteries Ltd, Calcutta U.P. Ceramics & Potteries Ltd. Ghaziabad

SHRI A. K. BHATIA ( Alternate ) SHRI A. K. CHOWDHURY SHRI G. C. DE

Ministry of Railways ( RDSO ) Export Inspection Council of India, Calcutta

SHRI R. K. SAXENA ( Alternate ) SHRI S. P. SINGH DHAKAREY Ministry of Defence ( DGI )

SHRI RAMAN GHANTI ( Alternate ) SHRI A. A. GANPULE

SHRI A. S. BURTE ( Alternate ) SHRI S. K. GHOSH

The Parshuram Pottery Works Co Ltd, Wankaner

All India Pottery Manufacturers' Association, Calcutta

SHRI N. D. DAVDA ( Alternate ) DR S. K. GUHA

SHRI ANIL KAKODKAR

SHRI S. R. KHANNA

SHRI R. SACHDEV ( Alternate )

Central Glass & Ceramic Research Institute (CSIR), Calcutta

The Federation of Hotel & Restaurant Association of India, Bombay

Directorate General of Technical Development, New Delhi

( Continued on page 2 )

IS : 3972 ( Part I/Sec 1 ) - 1982

2

( Continued from page 1 )

Secretary SHRI K. K. TRIPATHI

Deputy Director ( Chem ), ISI

Ceramic-Metal Systems Subcommittee, CDC 27:4

Convener SHRI S. S. VERMA

Members SHRI G. M. AGARWAL SHRI D. S. CHABHAL

SHRI D. P. NIYOGI SHRI S. K. SUR ( Alternate )

DR B. V. SUBBA RAO

Central Glass & Ceramic Research Institute (CSIR), Calcutta

Ferro Coatings & Colours Ltd, Calcutta Directorate General of Technical Development,

New Delhi Sur Enamel and Stamping Works Pvt Ltd, Calcutta

Ministry of Defence ( Metallurgical Research Laboratory & Directorate of Research in Basic Sciences )

SHRI G. R. K. MURTHY ( Alternate ) SHRI A. K. SEN Bengal Enamel Works Ltd, Calcutta

SHRI A. K. CHAKRABORTY ( Alternate ) SHRI P. SUR Vitreous Enamellers' Association, Calcutta

SHRI B. K. CHATTERJEE ( Alternate )

Members DR V. P. MAHESHWARY

Representing Development Commissioner ( Small Scale Indus-

tries ), New Delhi SHRI L. T. P. SINHA ( Alternate )

SHRI S. C. MEHTA India Tourism Development Corporation Ltd, New Delhi

SHRI ANIL BHANDARI ( Alternate ) SHRI D. P. NIYOGI Sur Enamel & Stamping Works Pvt Ltd, Calcutta

SHRI PRONOB KUMAR SUR ( Alternate ) DR L. M. PANDE

DR R. K. NIGAM ( Alternate ) SHRI P. JAGNATH RAO SHRI S. R. RATNAKAR

SHRI A. K. SAHA SHRI P. SUR

Ministry of Defence ( R & D )

E.I.D. Parry Ltd, Ranipat Directorate General of Tourism, Government of

India, New Delhi National Test House, Calcutta Vitreous Enamellers' Association, Calcutta

SHRI BIMAL K. CHATTERJEE ( Alternate ) SHRI S. K. MATHUR,

Head ( Chem ) Director General, ISI ( Ex-officio Member )

Indian Standard METHODS OF TEST FOR

VITREOUS ENAMELWARE PART I PRODUCTION OF SPECIMENS FOR TESTING

Section I Enamelled Sheet Steel

( First Revision )

0. F O R E W O R D 0.1 This Indian Standard (Part I) was adopted by the Indian Standards Institution on 27 December 1982, after the draft finalized by the Ceramic-ware Sectional Committee had been approved by the Chemical Division Council. 0.2 This standard was first issued in 1968. However, keeping in view the experience gained during the years and various International Standards brought out by the International Organization for Standardization (ISO) on the subject of testing vitreous enamels and enamelware, the Committee responsible for the perparation of this standard decided to revise it with a view to updating the existing methods of test and by incorporating those not covered earlier. The revised standard now comprises of two parts. Part I covers the production of specimen for testing enamelled sheet steel and cast iron, and Part II will cover various test methods. The Committee also decided to prepare a separate standard to deal with enamelled cast iron. 0.3 For testing both vitreous enamels and enamelware, either whole articles may be taken as specimen or portions may be cut out of them as specimens. Where this is not possible or when the loss in mass per unit area of the enamel coating is to be determined quantitatively, specimens may have to be prepared specially ( see 4 ) as the specimens cut from enamelled articles (see 5) may reduce the accuracy. Accordingly, in this standard ( Part I ) details have been given for the production of specially prepared specimens and also for cutting specimens for production articles. 0.4 In the preparation of this standard assistance has been derived from ISO 2723-1973 'Vitreous and porcelain enamels for sheet steel-production of specimens for testing', issued by the International Organization for Standardization ( ISO) .

3

IS : 3972 ( Part I/Sec 1 ) - 1982

1. SCOPE 1.1 This standard ( Part I ) specifies methods for the production of specimens suitable for testing vitreous enamels for sheet steel and enamelled sheet steel articles.

2. TERMINOLOGY 2.1 For the purpose of this standard the definitions given in IS : 2717-1979* shall apply.

3. SHAPE AND DIMENSIONS OF SPECIMENS 3.1 The specimens shall be flat, enamelled, circular, square or rectangular plate of steel sheet of a suitable diameter or side length or as required in specific test method not exceeding 110 mm.

NOTE — According to the carrying capacity of the commonly used analytical balances and with regard to the required weighing accuracy, the mass of the specimens prepared should, in principle, not exceed 200 g. Specimens exceeding 200 g may require special weighing equipment, otherwise the degree of accuracy may be impaired.

4. PRODUCTION OF SPECIALITY PREPARED SPECIMENS 4.1 Materials — The sheet steel, upon which enamel is applied, shall be of low carbon quality, having carbon content (as C) not exceeding 0.08 percent by mass. The enamelling quality steel is preferable for the purpose, but in absence of it cold rolled closed annealed type of steel may be used.

NOTE — It may be preferable to hang the specimens during weighing and enamell-ing; for this purpose a hole of approximately 2.5 mm diameter with its centre 3 mm from the edge of the test plate may be provided in the specimen.

4.2 Procedure 4.2.1 Regular Enamels for Sheet Steel— Prepare the metal for enamelling

by any one of the recognized procedures, but use the same procedure and materials for preparing specimens for comparison.

4.2.1.1 Apply ground coat by dipping, or spraying, on both sides of the specimen so that an agreed thickness of coating is obtained.

4.2.1.2 After drying, fusing and cooling of the specimen, apply the cover coat on to one side only. For ensuring that there is a minimum of build-up around the edge of the specimen, suitably wipe the applied enamel from the edges to a width of 2 or 3 mm after drying and then fuse.

NOTE — For most purposes one cover coat is standard procedure, but in cases where two or three cover coats are considered to be usual practice, the additional coats shall be applied.

*Glossary of terms relating to vitreous enamelware and ceramic-metal systems ( first revision ).

4

IS : 3972 ( Part I/Sec 1 ) - 1982

4.2.1.3 If by the enamelling of two cover coats, a smooth or defect-free surface is not obtained (see 4.3), reject the specimens. However, in the case of enamels for containers and apparatus to be used in the chemical industry, a third or even more layers of cover coat may be applied and fired; keeping the coating thickness on the edge as thin as possible.

4.2.1.4 Coating thicknesses may vary, but specimens for comparison shall be of the same thickness.

4.2.2 Direct-on Enamels for Sheet Steel — Prepare the metal surface as required for this process.

4.2.2.1 Apply the enamel on one or both side of the specimen or as required for any particular test.

NOTE — When application of one coat is the usual practice, apply one coat only. In cases where additional coating are a necessary part of the finish, these coatings shall be applied accordingly.

4.2.2.2 Coating thickness may vary but specimens for comparison shall be of the same thickness.

4.3 Quality of Surface Finish of Enamelled Specimen — The surface of the enamelled specimens shall be flat and free from defects.

4.3.1 The specimens shall be checked by visual inspection for freedom from defects. However, the specimens for enamels for containers and apparatus for the chemical industry shall be checked with high voltage for freedom from weak places and pinholes [see IS:3972 ( Part II )*]. The voltage to be used for the test shall be as agreed to between the interested parties.

5. SPECIMENS FROM PRODUCTION ARTICLES 5.0 General — Specimen shall be taken only from flat area of the enamelled articles. If the loss in mass per unit area of the enamel coating is to be determined quantitatively, the specimens shall be taken from those flat areas where the reverse side is protected by at least a ground or direct-on enamel coat as the case may be.

5.1 Procedure — Before cutting off the specimens, remove the enamel along the cutting surfaces on both sides of the metal by grinding, the width of the zone from which enamel is to be removed being determined by the width of the cutting tool and an extra margin of 2 mm for safety.

NOTE — Grinding machines are suitable for grinding off the enamel, where silicon carbide stones, corundum and diamond stones are applied.

*Methods of test for vitreous enamelled sheet steel : Part II ( under preparation ).

5

IS : 3972 ( Part I/Sec 1 ) - 1982

I N D I A N S T A N D A R D S ON CERAMICWARE

IS:

2333-1981 Plaster of paris for ceramic industry ( first revision ) 2717-1964 Glossary of terms used in vitreous enemelware industry 2781-1975 Glossary of terms relating to ceramicware ( first revision ) 2836-1974 Methods of test and quality requirements for porcelain laboratory

apparatus ( first revision ) 2837 ( Part I )-1975 Porcelain crucibles and basins: Part I Crucibles 2837 ( Part II )-1977 Porcelain crucibles and basins: Part II Basins 2838-1964 Stoneware containers for general purposes 2839-1964 Industrial stoneware 2840-1965 Chinaclay for ceramic industry 2857-1976 Earthenware dinnerware ( first revision ) 3149-1968 Enamel ware for home use ( first revision ) 3432-1965 Clay pipe triangles 3505-1979 Porcelain dinnerware ( first revision ) 3972-1968 Methods of test for vitreous enamelware 4589-1968 Ball clays for ceramic industry 6988-1973 Fine china dinnerware 7087-1973 Ceramic tower packings 7402 ( Part I )-1974 Ceramic water filters: Part I Filter containers 7402 ( Part II )-1975 Ceramic water filters: Part II Filter candles 7775-1975 Ceramic grinding media and lining 8017-1976 Vitreous enamelled reflectors for use with tungston filament lamps 8687 ( Part I )-1977 Methods of test for vitreous enamels and frits: Part I Sieve

analysis 8687 ( Part II )-1977 Methods of test for vitreous enamels and frits: Part II Fusion

flow test 8709-1977 Methods of test for vitreous enamel coatings, colour retention 9749-1981 Potash feldspar for glass and pottery

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