gypsum building plaster part i excluding premixed … · and number of amendments is gypsum...

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PRODUCT MANUAL ON

GYPSUM BUILDING PLASTER

PART I EXCLUDING PREMIXED LIGHT WEIGHT PLASTERS

IS 2547(Part I) - 1976

Bureau of Indian Standards


AMENDMENT SHEET

S NO AMENDMENT NO DATE PAGE NO CLAUSE NO


FOREWORD

Gypsum Building Plaster is extensively in many countries for general building operations

and for the manufacture of preformed gypsum building products which have the specific

advantages of lightness and high fire resistance.

This Product Manual is intended to cover all elements needed for grant of a product

certification licence and its continued operation providing reference material that can be

used in all Regional / Branch Offices and by various applicants / licensees to ensure

coherence of practice and transparency.

TABLE OF CONTENTS


SECTION CONTENT DETAIL PAGE NO

I PRODUCT DESCRIPTION 5

II RAW MATERIAL/COMPONENTS 6

III MANUFACTURING PROCESS & IN-PROCESS

QUALITY CONTROLS

7

IV CERTIFICATION CRITERIA 10

V INSPECTION AND TESTING 12


PRODUCT DESCRIPTION

SECTION 1.1 DESCRIPTION OF PRODUCT

Gypsum Plasters are classified on the basis of their physical and chemical

properties. These possess a definite set of properties due to hydration of calcium

sulphate, anhydrous or hemihydrate, to form gypsum and are used in the

manufacture of gypsum building materials. Gypsum plaster shall be classified as follows: a) Plaster of paris, b) Retarded hemihydrate gypsum plaster: Type I — Under coat: a) Browning plaster, b) Metal lathing plaster, Type II — Final coat plaster: a) Finish plaster, b) Board finish plaster, c) Anhydrous gypsum plasters are for finishing only, and d) Keene’s plaster is for finishing only.

SECTION 1.2 LATEST INDIAN STANDARD WITH PRODUCT TITLE

AND NUMBER OF AMENDMENTS

IS Gypsum Building Plaster—SPECIFICATION

Part I Excluding Premixed Light Weight Plasters AMENDMENTS -2

SECTION 1.3 LIST OF REFERRED INDIAN STANDARDS FOR RAW

MATERIALS/COMPONENTS AND TEST METHODS

LIST OF REFERRED INDIAN STANDARDS

IS No. Title

2469:1976 Glossary of terms relating to gypsum.

1288:1982 Method of test for mineral gypsum and gypsum products.

2542(Part-1):1978 Methods of test for gypsum plaster, concrete and products: Part 1

Plaster and Concrete.

460(Part 1):1985 Specification for test sieves : Part 1 Wire Cloth test sieves.

SECTION 1.4

CHECK LIST FOR SUBMISSION OF AN APPLICATION FOR GRANT OF

LICENCE


KINDLY REFER ANNEX 1

RAW MATERIALS/ COMPONENTS

Gypsum is required which is calcined with wood or coal. No material is added to gypsum plasters except those which are necessary to control the setting, such as sodium citrate, break-drown products of keratin, potassium sulphate, sodium sulphate, alum and zinc sulphate; or working characteristics such as Alkyl-Aryl sulphonate; or to impart anti-corrosion such as nitrates and nitrites of alkali metals or fungicidal properties.


MANUFACTURING PROCESS AND IN-PROCESS QUALITY

CONTROLS

Production Process Flow Chart

1. Best quality gypsum is picked from the market.

2. It is broken into small stones through lump crusher.

3. Small stone particles heated and calcined at per determined temp. Of approx 200˚C to

400˚C.

4. The mixture is cooled at specified temperature and passed through pulverized.

5. The sand particles. Dust and other impurities are removed from the mixture and pure

material is segregated.

6. The pure material is passed through various quality tests like reflectance. Purity setting

time and results are analyzed.

7. The material not conforming to standards is rejected and the pure material is packed in

HDPE bags with accurate weighment and stitch with stitching machines.

8. The packed material is store in moisture proof godown and dispatched to various locations

for sale.

SECTION 3.1 FLOW CHART OF MANUFACTURING PROCESS (TYPICAL)


SECTION 3.2 INFRASTRUCTURE FOR PRODUCTION

Manufacturing Machinery


S.No. Machinery Capacity Number Remarks

1 Lump Crusher with electric motor 15 HP, RPM 960

5 MT/Hrs. One -

2

Elevator for transporting material with 3 HP Motor, RPM 960 (Crompton)

5 MT/Hrs. One -

3 Bhati ( Wood/coal fire with 5 HP motor, RPM 960

1 MT/90 Minute

Two -

4

Pulveriser 32" chamber with dust collector freedom hopper with motor 50 HP

1.5 MT/Hrs One -

5 Electric Weighing Machine

Range 0-150Kg,

L.C. 10 gm One

6 Stitching Machine - Two -

7 Trolley For loading 50 Bags Two -

8 Temperature Controller (Located on Bhati No. 1)

Range 0-600˚C, L.C. 1˚C

One

9 Temperature Controller (Located on Bhati No. 2)

Range 0-600˚C, L.C. 1˚C

One

10 Power Connection 11 KV One -

Note : Adequate Electric Power and Water supply is required

CERTIFICATION CRITERIA

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SECTION 4.1 CRITICAL REQUIREMENTS OF THE INDIAN STANDARD

To be provided by CMD

SECTION 4.2 SCHEME OF TESTING AND INSPECTION

DOC:STI/2547(Part-1)/1;February 2005. Please see ANNEX 2.

SECTION 4.3 MARKING FEE RATES

Description Value

Unit 1 MT

L S Marking Fee 52200

S S Marking Fee 44200

Slab 1 Rate 1.6

Slab 1 Qty All

Slab 2 Rate 0

Slab 2 Qty 0

Slab 3 Rate 0

Enforcement Date 20060701

Remarks

SECTION 4.4 GROUPING GUIDELINES:

Gypsum Building Plaster has been classified on the basis of hydration of its Calcium sulphate content.

SECTION 4.5 GUIDELINES FOR WRITING SCOPE OF LICENCE The scope of licence to declare :

Plaster of Paris B hemihydrate (Type A or type B),

Retarded Hemihydrate Gypsum plaster,

Anhydrous Gypsum Plaster or

Keene’s Plaster

SECTION 4.6 GUIDELINES FOR INCLUSION OF NEW VARIETIES Based on classification(Section 4.5) inclusion of each new variety to be on the basis of independent testing of

sample of each variety.

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SECTION 4.7 SAMPLES SIZE One composite sample of approx. 2Kg of each variety for complete testing.

SECTION 4.8 MANNER OF SEALING THE SAMPLE

Samples may be wrapped with suitable moisture proof packing

material, labeled and wax sealed or as an alternate code no and

signatures of IO may be marked with a permanent marker pen on

the product.

SECTION 4.9 REMNANTS ARE RETURNABLE/NON-RETURNABLE TO BE

SCRAPPED/USED OR TO BE DESHAPED DISPOSAL IN CASE

OF SAFETY ITEMS

Sample is normally consumed in testing and Remnants are not

returnable and may be suitably disposed off by the laboratory.

SECTION 4.10

PROCEDURE TO BE FOLLOWED FOR DESTROYING/ DESHAPING/

RECYCLING THE PRODUCT THAT DOES NOT MEET THE QUALITY

PARAMETERS DURING REGULAR PRODUCTION

BIS Standard Mark to be marked only after ascertaining the quality

of the material after testing as per Indian standard and STI.

INSPECTION AND TESTING

SECTION 5.1 PACKING MATERIAL REQUIRED FOR PKG/DESPATCH OF

SAMPLE

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Any suitable material may be used for wrapping the sample to avoid moisture

and any damage during transit.

SECTION 5.2 LIST OF REQUIRED TEST EQUIPMENT/FACILITIES WITH

REQUIREMENT & FREQUENCY OF CALIBRATION

To be provided by CL

SECTION 5.3 STATUS OF TEST FACILITIES IN BIS LAB AND OSL WITH

TESTING CHARGES AND APPROXIMATE TIME REQUIRED

FOR TESTING

For latest information, please check the BIS web site www.bis.org.in

SECTION 5.4 WHETHER GRANT OF LICENCE WILL BE BASED ON

FACTORY TESTING BASIS---------------------------------------------No

INDEPENDENT TESTING BASIS--------------------------------------Yes

MIXED BASIS (FACTORY TESTING OF PRODUCT PLUS

INDEPENDENT TESTING OF SOME RAW MATERIALS)----------No

SECTION 5.5 DETAILS OF TESTS TO BE CARRIED OUT IN CASE OF

APPLICANT/VERIFICATION SAMPLES

• All tests

SURVEILLANCE SAMPLES

• All tests

• RAW MATERIAL SAMPLES TO BE GOT TESTED IF ANY --NIL

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CHECKLIST

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gypsum building plaster part i excluding premixed … · and number of amendments is gypsum...

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