IS 13435-5: Acrylic based polymer waterproofing material - Methods of test, Part 4: Determination of Minimum Film Forming Termperature and White Point

10 Pages·1992·3.5 MB·English

by  Bureau of Indian Standards

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IS 13435-5 (1992): Acrylic based polymer waterproofing
material - Methods of test, Part 4: Determination of
Minimum Film Forming Termperature and White Point [CED 41:
Waterproofing and Damp-Proofing]
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IS13435 (Part 5): 1992

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Indian Standard
ACRYLIC BASED POLYMER WATERPROOFING
MATERIALS - METHODS OF TEST
PART 5 DETERMINATION OF MINIMUM FILM FORMING TEMPERATURE
AND WHITE POINT
UDC 691'175'744'32'699·82'536·5
C> HIS 1992
8UREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 B AHADUR SHAH ZAFAR MARG
NEW DELHI 110002
July 1992 PriceGroup 2
Waterproofing and Damp-Proofing Sectional Committee, CED 41
FOREWORD
This Indian Standard ( Part 5) was adopted by the Bureau of Indian Standards, after the draft
finalized byWaterproofing and Damp-proofing Sectional Committee had been approved byCivil
Engineering Division Council.
Acrylic based polymers are now extensively used in the country for waterproofing and damp
proofing purposes necessitatingthe need of formulating a specification on the product. For
evaluating the quality and performance characteristics of theproduct, standardized test methods
are necessary to guide manufacture and users ofthe product.
Methods of tests for acrylic based polymer water proofing materials have been covered in
following parts:
Part 1 Determination ofsolid content
Part 2 Determination ofcoarse particles
Part 3 Determination ofcapillary water take-up
Part 4 Determination ofpH value
Part 5 Determination ofminimum filmforming temperature and white point
Part 6 Alakli resistant test
While formulating the above standards the Committee has taken into consideration the facilities
available in the country and the practiceprevailing in other countries.
In the formulation ofthis standards, assistance has been derived from the following publication:
ISO 2115: 1976 Plastics - Aqueous dispersions of polymers and co-polymers-
Determination ofwhite point temperature and minimum filmforming temperature.
In reporting the results ofa test or analysis made in accordance with the final value, observed
or calculated is to be rounded off, it shall be done in accordance with IS 2 : 1960'Rulesfor
rounding offnumerical values (revised)'.
]S IJ43! ( Part 5) : 1992
Indian Standard
ACRYLIC BASED POLYMER WATERPROOFING
MATERIALS - METHODS OF .TEST
PART 5 DETERMINATION OF MINIMUM FILM FORMING TEMPERATURE
AND WHITE POINT
1 SCOPE 4.1.2 At one end of the plate is a rheostate
controlled electricalresistance which constitute
1.1 This standard describes the method for the the hot source. At the opposite end is cold
determination ofthe white point temperature source, consisting either of an insulated
ofaqueous dispersion ofacrylic based polymer container in which refregerant is placed or
water proofing material and the minimum film of a coil inserted into the end of the plate
forming temperature. and through which refregerant mixture is
circulated.
2 TERM]NOLOGY
4.1.3 Evenly spaced along the plate are holes
2.1 For the purpose ofthis standard following into which thermometers may be inserted to
definitions shall apply. measure the temperature gradient ofthe plate
when the equilibrium is reached. The first hole
2.2 Minimum Film FormingTemperature(MFT) is positioned at the cold end of the plate at
right angles to the beginning of the channel, if
The limiting temperature above which a the plate has them.
continuous homogeneous film without cracks
is formed. 4.1.4 Provision should be made for placing
glass cover above the plate, leaving space
2.3 WhitePoint Temperature ( WP ) through which can be directed a slight current
of dry air dried, for example, by passing
The limiting temperature below which an
through a column packed with Calcium
opaque mass and above which a transparent
chloride at room temperature, from the cold
film is formed.
end to the hot end.
3 PRINCIPLE 4.2 Derlees for Temperature MeasoremeDt
The principle of the method is to spread out For temperature measurements mercury ther
one or morefilms ofthe dispersion on a metal mometer, resistance thermometer or ther
plate (aluminium, stainless steel or copper) mocouples, semi-conductor probes are used to
either level and smooth or channelled from one measure the temperature at the surface of the
side having higher temperature to other side sheet. The range of temperature measured is
having lower temperature to form a suitable _10° C to +150 C with an accuracy of0.10 C.
temperature gradient. Subsequently it is dried
with a current ofmoisture free air and deter 4.3 FibDSpreader
mination of the temperature at which the
transparent section ofthe dispersion meets the The film spreader shall be made of stainless
white section. steel, capable ofproducing simultaneously and
successively either films in the channels or
4 APPARATUS films about 0·1 mm thick and 20to 25mm wide
as plates without channel.
4.1 CoatingBencb
5 PROCEDURE
4.1.1 Test apparatus (see Fig. I) consisting
essentially of a rectangular plate,ofaluminium, 5.1 SettiDgthe Temperawe Gndieat
stainless steel or copper, whose surface may
either be perfectly level and polished. or may 5.1.1 The devices for temperature measurement
contain channel 0·3 rom deep and 20 mm wide. shall be put in place.
1
IS 1J.&35(Part5) :1m
SECTION AA
7
----,
A
KEY
1 RectangularMetalPlate 6 Glass Cover
2 ElectricalResistance 7 Insulating Material
3 Reservoir for Refrigerant Mixture 8 DryAirInlet
4 Holes forThermometers ( Diameter0'5 mm ) 9 Air Outlet
5 Channelsinthe Upper Surface of the Plate 10 FirstThermometer Hole
( Depth 0'3 mm)
PIG. 1. DIAGRAM OFTEST ApPARATUS GIVEN ASAN EXAMPLE
( THE PLATElN THISDIAGRAM ISCHANNELLED BUTTIDSPEATURE ISNOTEssENTIAL)
IS 13435( Part 5) : 1992
5.1.2 The heat source and the cooling medium 5.2.5 After complete separation of the section
shall be regulated to ensure the correct temper transformed into the film (transparent) and
ature gradient in polymer dispersion to be untransformed section (white) is visible,
tested. The temperature should drop by 20° to distance between the first point of temperature
40°C and remain constant during the test. The measurement and the line ofseparation shall be
temperature range shall be adjusted so that measured.
MFT occurs roughly in the centre.
5.2.6 The temperature indicated by various
5.1.3 The temperature gradient shall be linear, devices shall be noted and a graph using
that is, if equal distances are taken, the distance intervals between devices as the
pressure drop over each should also be equal. abscissa and the plate temperature as the
ordinate shall be plotted.
5.2 Determination of MFT and WP
NOTE- Iftbe temperature gradient is linear the
5.2.1 When using a level plate, the dispersion curveobtained is straight lineand in practice it is
shall be spread out with the film spreader then unnecessary to plot a graph.
starting from the end with the highest
5.2.7 Using the graph, the white point, temper
temperature. The dry coat thickness shall be
ature shall be determined. If a surface
0·10 to 0·15 mm and the width ofthe coat shall
thermometer is used the white point temper
be 20 mm. ature may be determined directly.
5.2.2 In the case of the channelled plate,
5.2.8 The lowest temperature where a
poured into the channel, at the end ofthe plate
continuous homogenous film without groups is
with the highest temperature andshall be spread
formed shall be determined to the nearest
out using the film spreader.
degree celsius. Thisistheminimumfilm forming
temperature.
5.2.3 Afterwards, the sheet of metal is covered
by the glass plate, and the polymer dispersion 6 REPORTING OF THE RESULT
is allowed to dry either by allowing a current
ofdried air to flow slowly over the sheet at a The test report shall give the following
constant rate from cold to heated one or informations:
by placing silica gel with a moisture indicator a) The identification characteristics of the
in the air space above the polymer dispersion. dispersion tested,
b) The type oftesting apparatus,
5.2.4 After the dispersion has dried, the
temperature shall be measured at that point on c) The value of white point remperature In
the bench at which boundary ofthe white layer degree celsius, and
has formed or at which a cohesive film just d) The minimum film forming temperature
commences to form, in degree celsius.
129
.L
4
27-5 2••1 SECTION AA
.
05
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3 24 9 24 21. 9 24 ]
FIG. 2 EXAMPLBOP A FILM SPRBADERFOR A CHANNELLED PLATB
3
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Doc: No. CED 41 ( 5029 )
Amendments Issued SincePublication
Amend No. Date ofIssue Text Affected
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