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“Invent a New India Using Knowledge”

है”ह”ह

IS 13360-6-5 (2001): Plastics - Methods of Testing, Part 6:Thermal Properties, Section 5: Determination ofFlammability of Plastic Materials for Parts and Devices inAppliances [PCD 12: Plastics]

IS 13360 (Part 6/See 5): 2001

Indian Standard

PLASTICS — METHODS OF TESTINGPART 6 THERMAL PROPERTIES

Section 5 Determination of Flammability of Plastic Materialsfor Parts and Devices in Appliances

ICS 83.080.01

@BIS 2001

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

February 2001 Price Group 4

Methods of Test for Plastics Sectional Committee, PCD 23

FOREWORD

This Indian Standard (Part 6/See 5) was adopted by the Bureau of Indian Standards, after the draft finalized bythe Methods of Test for Plastics Sectional Committee had been approved by the Petroleum, Coal and RelatedProducts Division Council.

The methods described in this standard involve standard size specimens and are intended to be used solely tomeasure and describe the flammability properties of materials, used in devices and appliances, in response toheat and flame under controlled laboratory conditions. The actual response to heat and flame of materialsdepends upon the size and form, and also on the end-use of the product using the material. Assessment of otherimportant characteristics in the end-use application includes, but is not limited to, factors such as ease ofignition, burning rate, flame spread, fuel contribution, intensity of burning, and products of combustion.

The final acceptance of the material is dependent upon its use in complete equipment that conforms with thestandard applicable to such equipment. The flammability classification considered for a material may vary,depending on the equipment or device involved and the particular use of the material. The performance level ofa material by these methods should not be assumed to correlate with its performance in end-use application.

The requirements may be applied to other non-metallic materials if found to be appropriate.

These requirements do not cover plastics when used as materials for building construction of finishing.

While preparing this standard considerable assistance has been derived from ANSUUL 94:1985 ‘Tests forflammability of plastic materials for parts in devices and appliances’ issued by the Underwriters’ Laboratories,Inc.

In reporting the results of a test or analysis in accordance with this standard, if the final value, observed orcalculated, is to be rounded off, it shall be done in accordance with IS 2:1960 ‘Rules for rounding off numericalvalues (revised)’.

IS 13360 (Part 6/See 5) :2001

Indian Standard

PLASTICS — METHODS OF TESTINGPART 6 THERMAL PROPERTIES

Section 5 Determination of Flammability of Plastic Materialsfor Parts and Devices in Appliances

1 SCOPE

This standard (Part 6/ Sec 5) covers tests for flamma-bility of plastics materials used for parts in devices andappliances. They are intended to serve as a prelimi-nary indication of their acceptability with respect toflammability for a particular application.

2 HORIZON’IAL BURNING TEST FORCLASSIFYING MATERIAM 94HB

2.1 Test Criteria

A material shall be classified 94HB on the basis of testresults obtained on small bar specimens when testedas described in 2.4 to 2.12.

2.2 A material classed 94HB shall (see also 2.3):

a) not have a burning rate exceeding 38.1 mm perminute over a 76.2 mm span for specimens havingthickness of 3.05 to 12.7 mm or

b) not have a burning rate exceeding 76.2 mm perminute over a 76.2 mm span for specimens havinga thickness less than 3.05 mm, or

c) cease to burn before the flame reaches the102mm reference mark (see 2.10).

2.3 If only one specimen from a set of three specimensdoes not comply with the requirements, another setof three specimens is to be tested. All specimensfrom this second set shall comply with the require-ments in order for material in that thickness to beclassified 94HB.

2.4 Apparatus

The apparatus employed is to consist of the following:

a)

b)

c)

d)

e)

f)

g)

h)

Test Chamber Enclosww or Laboratory Hood--free of induced or forced draft during tests.Laboratory Burner—A Bunsen of Tirrill burnerhaving a tube with a length of 80 to 100 mm and

an inside diameter of 94 y~,flmm The tube is

not to be equipped with an end attachment, suchas a stabilizer.

W%?Gauze-A20meah(20 openingsper25.4 mm),0.43mmdiameterironwire gauzq 127mmsquam.Gas SupplPA supply of technical grade meth-ane gas with regulator and meter for uniform gasflow. Natural gas having a heat content ofapproximately 37 MJ/nf has been found to pro-vide similar results. Other fuel gases, such asbutane, propane and acetylene (which have ahigher heat value) may also be used. However,technical grade methane gas shall be used in caseof dispute.Ring Stand — A ring stand with clamps, or theequivalen~ for horizontal positioning of the speci-men and the wire gauze.Stopwatch or other timing device.

Conditioning Room or Chamber — Capable ofbeing maintained at 27 * 20C and a relativehumidity of 65 * 5 percent.

A Metaf Support Fixture — As illustrated inFig. 1 for testing specimens that sag or bend at

eAll dimensions in millimetres

Fm I FLEXIBLESPECIMENSUPPORTFIxm_.m

1

IS 13360 (Part 6/See 5) : 2001

their free end.

2.5 Test Specimens

Test specimens are to be limited to a maximum thick-ness of 12.7 mm. Test specimens of a 127mm length by12.7mmwidtharetobeprovided in the minimumthick-nessandina 3.18~0.13mmthickness. The3.18~0.13mm thick specimens are not necessary if the minimumthickness is greater than 3.18 f 0.13 mm or the maxi-mum thickness is less than 3.18 t 0.13 mm.

Ekception: A material classified94HBin the 3.18*O. 13mm thickness shall automatically be classed 94HBdown to a 1.57 mm minimum thickness withoutadditional testing.

2.6 The specimens are to comply with the following:

a) The maximum width is tobe 13.2W, and

b) The edges are to be smooth, and the radius onthe corners is not to exceed 1.3 mm.

2.7 If a material is to be considered in a range ofcolours, melt flows, or reinforcements, specimens rep-resenting these ranges are also to be provided. Speci-mens in the natural (ifused in this colour) and in themost heavily pigmented light and dark colours are tobe provided and considered representative of thecolour range, if the test results are essentially the same.An additional set of specimens is to be provided in theheaviest organic pigment loading, unless the mostheavily pigmented light and dark colours include thehighest organic pigment level. When certain colourpigments (forexample, red,yellow,orthelike) me knownto have particularly critical effects, they are also to beprovided. Specimens in the extremes of the melt flowsand reinforcement contents are to be provided andconsidered representative of the range, if the testresolts are essentially the same. If the burning charac-teristics are not essentially the same for all specimens

representing the range, evaluation is to be limited onlyto the material in the colours, melt flows, and reinfome-ment contents tested, or additional specimens inintermediate colours, melt flows, and reinforcementcontents are to be provided for tests.

2.8 Specimen Conditioning

The specimens are to be conditioned for at least 48 h at27& 2°C md a relative humidity of 65 ~ 5 percent priorto testing.

2.9 Test Method

The burning test is to be conducted in a chamber, en-closure, or laboratory hood free of induced or forceddraft. An enclosed laboratory hood with a heat-resist-ant-glass window and an exhaust fan for removing theproducts of combustion after the testis recommended.

2.10 Each specimen is to be marked across its widthwith two lines, 25.4 and 102 mm from one end of thespecimen. The specimen is to be clamped at the endfarthest from the 25.4 mm mark, with its longitudinalaxis horizontal and its transverse axis inclined 45°. Thewire gauze is to be clamped horizontally beneath thespecimen, with a distance of 9.5 mm between thelowest edge of the specimen and the gauze, and withthe fr= end of the specimen even with the edge of thegauze. (see Fig. 2).

2.10.1 If the speeimen Sags at its free end during theinitial set up, the support fixture illustrated in Fig. 1 is tobe positioned under the specimen with the smallextending portion of the support fixture 19mmfium thefree end of the specimen. Enough clearance is to beprovided at the clamped end of the speeimen so thatthe support fixture can be freely moved sidewards. Asthe flame front progresses along the Speeime% thesupport fixture is to be withdrawn at the same rate.

2.11 The burner is then to be placed remote from the

n

1 I

FIG.2 HOMZONTALBURNINGTESTFOR94HB CLASSIFICATION

2

specimen, ignited, and adjusted to produce a blue flame25 mm high. The flame is to be obtained by adjustingthe gas supply and the air ports of the burner until a25 mm yellnw tipped blue flame is produced and thenthe air supply is to be increased until the yellow tipdisappears. The height of the flame is to be measuredagain and corrected if necessa~. The flame is to beapplied to the free end at the lower edge of the speci-men. The centre axis of the burner tube is to be in thesame vertical plane as the longitudinal bottom edge ofthe specimen (and inclined toward the end of thespecimen)at an angle of approximately 45° to the hori-zontal. (see Fig. 2). The flame is to be applied so thatthe front edge of the specimen, to a depth of approxi-mately 6.4 mm, is subjected to the test flame for 30swithout changing the position of the burner, and isthen removed from the specimen. If the specimen burnsto the 25.4 mm mark before the flame has been appliedfor 30 s, the flame application is to be discontinuedwhen the flame reaches the 25,4 mm mark.

2.12 If the specimen continues to bum after removalof the test flame, the time for the flame front to travelfrom the mark 25.4 mm from the free end to the mark102 mm from the free end, is to be determined and therate of burning is to be calculated.

3 VERTICALBURNING~T FORCLASSIFYINGMATERIALS 94V-0,94V-10R94V-2

3.1 Test Criteria

Materials shall be classified 94V-0, 94V-1 or 94V-2 onthe basis of results obtained on small bar specimenswhen test as described in 3.6 to 3.15.

3.1.1 Some materials, due to their thinness, distort,shrix& or are consumed up to the holding clamp whensubjected to this test. These materials maybe testedaccording to the Yertical burning test for classifyingmaterials 94VTM-0, 94VTM-1 or 94VTM-2, providedspecimens can be properly formed.

3.2 Materials Classed 94V-O

A material classed 94V-Oshall (see also 3.5):

a)

b)

c)

d)

e)

not have any specimens that bum with flamingcombustion for more than 10s after either appli-cation of the test flame,

not have a total flaming combustion time exceed-ing 50 for the 10flame applications for each set offive specimens,

not have any specimens that bum with flaming orglowing combustion up to the holding clamp,

not have any specimens that drip flaming parti-cles that ignite the dry absorbent surgical cottonlocated 305 mm below the test specimen, and

not have any specimens with glowing

IS 13360 (Part 6/See 5) :2001

combustion that persists for more than 30s afterthe second removal of the test flame.

3.3 Material Classed 94V-1

Amatenal classed 94V-1 shall (see also 3.5):

a)

b)

c)

d)

e)

3.4

not have any specimens that bum with flamingcombustion for more than 30s after either appli-cation of the test flame,

not have a total flaming combustion time exceed-ing 250s for the 10flame applications for each setof five specimens,

not have any specimens that burn with flaming orglowing combustion up to the holding clamp,

not have any specimens that drip flaming parti-cles that ignite the dry absorbent surgical cottonlocated 305 mmbelowthe test specimen, and

not haye any spcimens with glowing combus-tion that persists for more than 60 s after thesecond removal of the test flame.

Materials Classed 94V-2

A material classed 94V-2 shall (see also 3.5):

a)

b)

c)

d)

e)

3.5

not have any specimens bum with flaming com-bustion for more than 30s after either applicationof the test flame,

not have a total flaming combustion time exceed-ing 250s for the 10 flame applications for each setof five specimens,

not have any specimens that bum with framing orglowing combustion up to the holding clamp,

be permitted to have specimens that drip flamingparticles that bum only briefly, some of whichignite the dry absorbent surgical cotton placed305 mm below the test specimen, and

not have any specimens with glowing combus-tion that persists for more than 60 s after thesecond removal of the test flame.

If only one specimen from a set of five specimensdoes not comply with the requirements, anoher set offive specimens is to be tested. In the case of the totalnumber of seconds of flaming, an additional set of fivespecimens is to be tested if the totals are in the rangeof51 to 55 seconds for 94V-Oand 251 to 255 secondsfor 94V-1 and 94V-2. All specimens ffomthis secondset shall camply with the appropriate requirements inorder for the material in that thickness to be classifkd94V-0,94V-1or94V-2.

3.6 Apparatus

The apparatus employed is to consist of the following:

a)

3

Test Chamber Enclosurw or Laboratory Hood —free of induced or forced draft during tests.

IS 13360 (Part 6/See 5) : 2001

b)

c)

d)

e)

o

I_+!)

h)

J)

3.7

Laboratory Burner—A Bunsen or Tirril burnerhaving a tube with a length of 80 to 100 mm and

an inside diameter of 94 ~~,~mm. The tube is

not to be equipped with an end attachment, suchas a stabilizer.

Ring Stand—A ring stand with clamps or theequivalent, adjustable for vertical positioning ofspecimens.

Gas SupplPA supply of technical grade meth-ane gas with regulator and meter for uniform gasflow. Natural gas having a heat content of ap-proximately 37 MJ/m3 has been found to providesimilar results. However, technical grademethane gas is to be used in case of dispute.Other fuel gases, such as butane, propane, andacetylene have a higher heat contact and are notacceptable.

Stopwatch or other timing device.

A supply of dry absorbent surgical cotton,

.4 Desiccator-containing anhydrous calciumchloride.

Conditioning Room or Chamber — capableof being maintained at 27 ~ 20C and a relativehumidity of 65 ~ 5 percent.

Conditioning Oven-A full draft air-circulatingoven capable ofbeing maintained at 70 t 10C.

Test Specimens

Test specimens, 127mminlengthby 12.7mm in widthin the minimum and maximum thicknesses are to betested covering the thickness range to be considered.Specimens tested by this method are limited to a maxi-mum thickness of 12.7mm. Specimens ininterrnediatethicknesses are also to be provided and maybe testedif the results obtained on the minimum or maximumthickness indicate a need. Intermediate thicknessesare not to exceed increments of 3.18 mm. The speci-mens are to comply with the following:

a) The maximum width istobe 13.2mm.

b) The edges are to be smooth and the radius on thecomers is not to exceed 1.27 mm.

3.8 If the material is to be considered in a range ofcolours, melt flows, or reinforcements, specimensrepresenting those ranges are also to be provided.Specimens in the natural (if used in this colour) and inthe most heavily pigmented light and dark colours areto be provided and considered representative of thecolour range, if the burning characteristics are essen-tially the same. An additioml set of specimens is to beprovided in the heaviest organic pigment loading,unless the most heavily pigmented light and dark col-ours include the highest organic pigment level. When

certain colour pigments (for example, red, yellow, orthe like) are known by eqwrience to have particularlycritical effects, they are also to be provided. Speci-mens in the extremes of the melt flows and reinforce-ment contents are to be pr?wided and consideredrepnasentative of the range, if the burning chamete&-tics are essentially the same. If the burning character-istics are not essentially the same for all specimensrepresenting the range, evaluation is to be limited onlyto the material in the colom melt flows and reinforce-ment contents tested, or additional specimens in inter-mediate colours, melt flows, and reinforcementcontents are to be provided for tests.

3.9 Specimen Conditioning

Specimen sets are to be conditioned as follows:

a)

b)

Sets of five specimens each are to be conditionedfor at least 48 h at a temperature of 27 ~ 20Cand arelative humidity of 65 t 5 percent prior totesting.

Sets of five specimens each are to be conditionedinanair-cim&t@ovenfor 168hat70A1°Candthen cooled in a desiccator, over anhydrouscalcium chloride, for atleast 4 h at room tempera-ture prior to testing.

Exception: As an alternative to 168 h at 70 ~ l“C,industrial laminates may be conditioned for 24 h at125~10C.

3.10 ‘l&t Method

The burning test is to be conducted in a chamber,enclosure, or laboratory hood the of induced or forceddraft. An enclosed laboratory hood with a heat-resist-ant glass-window and an exhaust fan for removing theproducts of combustion afler the testis recommended.

3.11 Each specimen is to be supporkxl from the upper6.4 mm of the specimen with the longitudinal axisver-tical, by the clamp of the ring stand so that the lowerend of the specimen is 9.5 mm above the top of thebumertube and 305 mmabove a horizontal layer of dryabsorbent surgical cotton. To form the horizontal layer,a small portion approximately 12.7x 25.4 mm ofcottonis to be pulled from the supply with thumb andforefinger and then thinned and spread with thefingers into a 5.08 mm square having a fre@andingthickness of 6.4 mm.

3.12 The burner is then to be placed remote from thespecimen, ignited and adjusted to produce a blue flame19 mm high. The flame should be obtained by adjust-ing the gas supply and the air ports of the burner untila 19 mm yellow-tipped blue flame is produced andthen an increase in the air supply is to be made untilthe yellow-tip disappears. The height of the flame is tobe measured again and corrected, if necessa~.

3.13 The test flame is to be placed centrally under thelower end of the test specimen and allowed to remainfor 10a The test flame is then to be withdrawn at least152 mm away and the duration of flaming of the speci-men noted. When flaming of the specimen ceases, thetest flame is to be immediately placed again under thespecimen. Mter 10 s, the test flame is again to bewithdrawn, and the duration of flaming and glowing isto be noted.

3.14 If the specimen drips molten or flaming materialduring either flame application, thebumer rnaybetiltedto an angle up to 45° and also slightly withdrawn fromone of the 12.7 mm sides of the specimen during theflame application, to avoid material dripping into thetube of the burner. If the specimen drips molten orflaming material or is consumed during the test, theburner is to be hand-held, and the 9.5 mm distancebetween the bottom of the specimen and the top of theburner tube is to be maintained during the flame ap@i-cation. Any molten strings of the material are to beignored, and the flame is to be applied to the majorportion of the specimen.

3.15

a)

b)

c)

d)

e)

The following are to be obsemed and recorded:

Duration of flaming after fm flame application,

Duration of flaming after second flame applica-tion,

Duration of flaming plus glowing after secondflame application

Whether or not specimens bum up to the hold-ing clamp, and

Whether or not specimens drip flaming particlesthat ignite cotton swatch.

4 VERTICALBURNJNGTEfjT FORCI.&SIFyINGMATERIALS 94-W

4.1 Test Criteria

A material shall be classified 94-5V on the basis of teatresults obtained on small bar specimens when testedw described in 4.5 to 4.14.

4.2 A material classed 94-5V shall (see also 4.4).

a) not have any specimens that bum with flaming orglowing combustion for more than 60s after thetitlh flame, and

b) not have any specimens that drip any particles.

4.3 In conjunction with 4.2 observation shall be made.for destruction of the specimens during and after tests.If any specimens are observed to undergo shrinkage,elongation, melting or the like, additional tests shall beconducted on 152 mm x 152 mm plaques of the samethickness, in accordance with 4.15 to 4.20. Tests ofplaques shall also comply with 4.2.

IS 13360 (Part 6/See 5) :2001

4.4 If only one specimen from a set of five specimensdoes not comply with the requirements, another set offive specimens are to be tested. All specimens fromthis second set are to comply with the requirements inorder for the material in that thickness to beconsidered acceptable.

4.5 Apparatus

The apparatus employed is to consist of the following:

a)

b)

c)

d)

e)

f)

g)

h)

J)

Test chamber Encloswv, or Laboratory Hood—free of induced or forced draft during tests.

Laboratory Burner—A Tirrill burner having atube with a length of 80 to 100 mm and an inside

diameter of 94 ~)$ mm. The tube shall not be

equipped with an end attachment, such as stabi-l.imr

Ring Stand—A ring stand with clamps or theequivalent, adjustable for vertical positioning ofspecimens.

Gas Supply—A supply of technical grademethane gas with regulator and meter fm uniformgas flow. Natural gas having a heat content ofapproximately 37 MJ/m3 has been found toprovide similar results. However, technical grademethane gas is to be used in case of dispute.Other fuel gases, such as butane, propane andacetylene have a higher heat content and are notacceptable.

Mounting Block—A block capable of position-ing the burner at an angle of 20°from the vertical.

Stopwatch or other timing device.

A Desiccator—Containing anhydrous calciumchloride.

Conditioning Room or Chamber—Capable ofbeing maintained at 27 ~ 2W and arelativehumid-ity of 65 ~ 5 percent.

Conditioning Oven-A full draft air-circulatingoven capable ofbeing maintained at 121 ~ 10C.

4.6 Test Specimens and Plaques

Test specimens, 127 mm x 12.7 mm and test plaquesapproximately 152 mm x 152 mm are to be tested in aminimmnand maximmnthicknesses mveringthethick-ness rangetobe considered.The specimens andplaqnestestedbythismethod amlimitedtoamaximmnthickneasof12.7mm. Specimenandplaqueainintmmdia&thiCk-nesses am also to be provided and maybe tested if theresultsobtainedon the minimum or maximmnthicknessindicate a need. Intermediate thicknesses are not to ex-ceedincrementsof 3.18mm. The specimensandplaquesare to complywith the following:

a) The maximum specimen width is to be 13.2 mm,and

5

IS 13360 (Part 6/Sec5) : 2001

b) The edges are to be smooth and the radius on thecomers is not to exceed 1.27 mm.

4.7 If the material is to be considered in a range ofcolours, melt flows, or reinforcement, specimens andplaques representing those ranges are also to be pro-vided. Specimens and plaques in the mtural (if used inthis colour) and in the most heavily pigmented lightand dark colour are to be provided and be consideredrepresentative of the colour range, ifthe burning char-acteristics are essentially the same. An additional setof specimens is to be provided in the heaviest organicpigment loading, unless the most heavily pigmentedlight and dark colours include the highest organic pig-ment level. When certain colour pigments (for exam-ple, red, yellow or the like) are known by experience tohave particularly critical effeets, they are also to beprovided. Specimens and plaques in the extremes ofthe melt flows and reinforcement contents are to beprovided and considered representative of the range,if the burning characteristics are not essentially thesame. If the burning characteristics are essentially thesame for all speeimens and plaques representing therange, evaluation is to be limited only to the materialsin the colours, melt flows, and reinforcement contentstested, or additional specimens and plaques in inter-mediate colours, melt flows, and reinforcementcontents are to be provided for tests.

4.8 Speeimen and Plaque Conditioning

The sets of five specimens and/or plaques are to beconditioned as follows:

a) Each set is to be conditioned for at least 48 h at atemperature of 27 ~ 20Cand a relative humidity of65 ~ 5 percent prior to testing, and

b) Each set is to be conditioned in a circulating airoven for a duration of 60 days at 121 ~ 10Candthen cooled in a desiccator over anhydrouscalcium chloride for at least 4 h at room tempera-ture prior to testing. Other temperatures and/orexposures may be selected based on application.

4.9 Method A, Test of Speeimens

The Burning test is to be conducted in a chamber, en-closure, or laboratory hood free of induced or forceddraft An enclosed laborato~ hood with a heat resist-ant glass window and an exhaust fan from removingthe products of combustion after the test is recom-mended.

4.10 The test specimen is to be supported from theupper 6.4 mm of the specimen, with the longitudinalaxisvertical, by the clamp on the ring stand. The burneris to be supported on the inclined plane of a mountingblock so that the burner tube maybe positioned at 20°from the vertical. The narrow edge of the specimen isto be face the burner (see Fig. 3).

4.11 The burner is to be placed remote from the speci-me~ ignited, and in a darkened room, adjusted so thatwhen the burner is in a vertical position, the overallheight of the flame is 127 mm, and the height of theinner blue cone is 38 mm (see Fig. 3).

4.12 The flame is then to be applied to one of the lowercomers of the speeimen at an angle of 20° from thevertical, so that the tip of the blue cone touches thespecimen (see Fig. 3).

4.13 The flame is to be applied for 5s and removedfor 5s. The operation is to be repeated until the speci-men has been subjeeted to five applications of the testflame.

.

SPECIMEN

/

2@

Fm. 3 VERTICALBURNINGTESTFOR94-5V CLASSIFICATION

6

4.14 After the fifth removal of the test flame, thefollowing are to be observed and recorded:

a)

b)

c)

d)

Duration of flaming plus glowing,

The distance the specimen burned or wasaffected,

Whether or not specimen dripped particles dur-ing test, and

Observations of deformation and physicalstrength immediately after burning and whencooled.

4.15 Method B, Test of Plaques

The burning test is to be conducted in a chamber,enclosure, or laboratory hood free of induced or forceddraft. An enclosed laboratory hood with a heat resist-ant glass window and an exhaust fan for removing theproducts of combustion after the testis recommended.

4.16 The plaques are to be tested in various positionsso that the test flame is applied as follows:

a)

b)

c)

Plaque vertical with the flame applied to lowercomer of the plaque,

Plaque vertical with the flame applied to loweredge of the plaque,

Plaque vertical with the flame applied to centre ofone side of the plaque,

IS 13360 (Part 6/See 5) :2001

d) Plaque horizontal with the flame applied to thecentre of the bottom surface of the plaque, and

e) Plaque horizontal with the flame directed down-ward to the top surface of the plaque.

4.17 The burner is to be placed remote from the spebi-men, ignited, and adjusted so that when the burner isin a vertical position, the overall height of the tlame is127~ and the height of the innerblue cone is 38 mm(see also 4.11).

4.18 The flame is then to be applied to the test plaquesin each of the positions given in 4.16 at an angle of 20°from the vertical, so that the tip of the blue cone touchesthe specimen.

4.19 The flame is to be applied for 5s and removed for5 s. The operation is to be repeated until the plaquehas been subjectedto five applications of the test flame.

4.20 After the fifth removal of the test flame, thefollowing are to be observed and recorded:

a)

b)

c)

d)

Duration of flaming plus glowing,

The distance the plaque burned or was affected,

Whether or not particles dripped from the plaqueduring the test, and

Observations of deformation and physicalstrength immediately after burning and whencooled.

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Doc : No. PCD 23 (1683),

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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{

8329295,8327858MUMBAI 400093 8327891,8327892

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