EMULSIOR PAINTS FOR INTERION AND EXTERIOR USES
1 – SCOPE AND FIELD OF APPLICATION
* This Omani Standard specifies performance requirements and appropriate methods
of test for emulsion paints for interior and exterior use applied by brush, roller or
spray techniques. It covers matt and silk emulsion paints which can be applied to
non-metallic substances classified into three types covering different circumstances
where the paint may be applied. It also specifies requirements for the marking of
containers which may be of a range of nominal capacities.
2 - DEFINITIONS
2.1
Emulsion
A mixture formed by the incorporated of two liquids which are normally immiscible.
One liquid is dispersed in the other in the form of minute drops. If the droplets reamin
permanently dispersed the emulsion is said to be stable and certain compound are
added as stabilizers of their power to keep the droplets dispersed.
2.2
Emulsion for paint
A dispersion of 2 or more organic monomers which are copolymerised and dispersed
in water. The dispersed phase is in the form of minute drops. The droplets remain
permanently dispersed. The emulsion is said to be stable and certain compound are
added as stabilizers because of their power to keep the droplet dispersed.
2.3
Vehicle
The liquid portion of the paint in which the pigment is dispersed and it is composed of
the binder and the thinner if any.
2.4
Pigment
The insoluble dispersed particles in a paint which give the dried film its characteristic
properties of colour and opacity.
2.5
Opacity
The ability of a coat of paint to obscure (hide) an underlying surface.
2.6
Binder
The non-volatile portion of the “Vehicle” of a paint. It binds or cements the pigments
particles together and the paint film as a whole to the material to which it is applied.
Paints/C.driver
2.7
Thinner
Volatile liquids added to paints or varnishes to facilitate application and to aid
penetration by lowering gather viscosity. They should be completely miscible with the
paints or varnish at ordinary temperature and should not cause precipitation of the
non-volatile portion either in the container or in the film during drying. For some
purposes thinner containing a small proportion of non-volatile material may be used.
2.8
Drying time
The time which elapses between the application of a coat of paint and the attainment of
a specified dry state.
2.9
Lifting
Failure caused by the swelling of a dry film of paint or varnish when another coat is
applied over it an usually manifested by wrinkled appearance.
3 – CHARACTERISTICS AND REQUIREMENTS
3.1
Composition
The emulsion paint shall consist of pigments with suitable extenders in suitable
proportion in a medium consisting of any suitable stable synthetic polymer emulsion in
water with other suitable ingredients as may be necessary to produce a material so as to
satisfy the requirements of this standard.
3.2
Condition in container
The material shall have no evidence of biological growth, levering, skinning,
putrefication, hard settling of the pigment, lumps, or corrosion of the container. Any
settled pigment shall be readily dispersible in the liquid medium by stirring with paddle
to produce smooth homogeneous emulsion paints, free from persistent foam. The
material shall have no irritating of offensive odor.
3.3
Non-volatile content
The percent of non-volatile content of the emulsion paint shall not be less than 40% by
weight.
3.4
Consistency
The paint shall be in such a condition that stirring readily produces a smooth uniform
mixture of good consistency. It shall have aminimum 80 KU viscosity for matt and 60
KU viscosity for silk and gloss at 25 ○C.
Paints/C.driver
3.5
Colour
The colour of the paint shall be close to the approved reference sample.
3.6
Thinning
The paint shall have tendency to mix readily with water if necessary to a smooth and
homogeneous state with minimum amount of foaming. Foaming if any shall dissipate
rapidly.
3.7
Fineness of grind
The particle size of the paint shall be less than 50 microns.
3.8
Lead content
The lead content shall not exceed 0.06% of the total mass of the paint.
3.9
Application properties
The material after recommended thinning shall be suitable for application by brush,
spray, or roller. The resulting paint film shall not show pigment flocculation, foaming,
coarseness or other undersirable characteristics. The paint film shall also produce no
lifting, softening or any other defects upon recoating of a previously painted surface
after minimum 4 hours for matt and minimum 8 hours for silk and gloss of air
drying.
3.10
Drying time
-
3.11
The paint shall have surface drying time not more than 30minutes for matt and
not more than 2 hours for silk and gloss.
The paint shall become hard-dry in a time not more than 4 hours for matt and
not more than 8 hours for silk and glass at film thickness of 100 micron wet on
glass panel under temperature of 27 + 2° C and humidity of 60% - 70% with air
circulation and without exposing to the sun.
Appearance of dried film (finish)
When a film of the paint has dried for the specified drying period in 3.10, it shall have,
smooth, firmly adherent and substantially free from brush marks or sagging or
wrinkling, and shall in no way be inferior as regards finish to a film prepared in the
same way and the same time from the approved reference sample.
Paints/C.driver
3.12
Scrub resistance
The paint film coating the panel test shall not worn when exposed to :
1500 scrub cycles for type A for interior/exterior gloss and semi-gloss
600 "
"
"
B for interior/exterior flat emulsion paints
emulsion paints
80
"
"
"
C for interior flat emulsion paints
3.13
Water resistance
The paint film shall show good adhesion hardness and shall show no wrinkling
re-emulsification or other changes after 2 hours for type A and 1 hour for type B when
water resistance test is carried out.
3.14
Alkali resistance (white and pastel shades)
The paint film shall show no change in hue, lightness, gloss and any other surface
defects when alkali resistance test is carried out.
3.15
Heat stability
The viscosity of the paint shall not change more than 5% of the original and shall show
no coagulation flocculation or discolorations after carrying out the test of heat stability.
3.16
Odour
The odour of the paint shall not be putrid or otherwise offensive or irritating before,
during and after application. There shall be no residual odour after 24 hours of drying.
3.17
Dry opacity (white and pastel shades)
The paint when applied shall give a minimum dry film contrast ratio
Type of the paint
Category
Matt
Silk
A
B
C
95%
90%
90%
80%
80%
- %
Gloss
75%
75%
-%
at 175 micrometer bar coated applicator on black and white chart paper allow to dry
overnight test it on computer.
3.18
Colour fastness to light. (for interior use only)
The paints shall show no darkening or other changes in appearance when subjected to
72 hours exposure for direct sun or any other light source light.
Paints/C.driver
3.19
Durability test (For exterior use only)
The paint film shall show no undue change, blistering, chalking, colour fading and
films irregularities when subjected to 300 hours exposure for class A and 100 hour
exposure for class B.
3.20
Resistance to biological growth
The paint in container shall show no fungus growth for a period of 12 months at 40 C
3.21
Keeping properties
The paint when stored under normal storage conditions i.e. in shed at temperature not
exceeding 40º C in the original sealed containers, shall retain properties specified in this
standard for a period of not less than 12 months.
4- SAMPLING
4.1
4.2
Take a representative sample of the paint not less than 500 ml according to the methods
mentioned in Omanian Standards O.S. 194/1999 “Paints and varnishes-Sampling”.
Sample shall be prepared to tests according to the methods mentioned in Omanian
Standard O.S. 196/1990 :Paints and Varnishes. Examinational and preparation of
samples for testing”.
5- METHODS OF TESTING
5.1
The following tests shall be carried out on the filled containers selected according to
item 4.1 after carrying out the visual examination of the labeling information.
5.2
The following tests shall be carried out on the paint sample taken from each container
selected in according with item, 4.1.
5.2.1
Determination of non-volatile content according to Omanian Standard O.S……241/92
“Paints and varnishes-Determination of volatile and non –volatile matter”.
5.2.2
5.2.3
Determination of colour according to this Gulf Standard.
Determination colour according to ISO 3668/76.
5.2.4
Determination of fineness of grind according to Omani Standard O.S 239/92 “Paints
and Varnishes-Determination of fineness of grind”.
5.2.5
Determination of lead content according ISO 3856/84 part I “Paints and VarnishesDetermination of lead content”.
5.2.6
Determination of application properties according to this Gulf Standard.
5.2.7
Determination of drying time according to Omani Standard No. 494/94 “Paints and
Varnishes-Determination of drying time.
Paints/C.driver
5.2.8
Determination of appearance of dried film (Finish) according to this Omani standard
5.2.9
Determination of scrub resistance according to ASTM D 2486/89 without using a scrub
media and a detergent solution of 0.5%.
5.2.10 Determination of water resistance according to ISO 2812/93 part 2
5.2.11 Determination of alkali resistance according to Omani Standard 1298/2002 “Paints
and Varnishes-Determination of alkali resistance”.
5.2.12 Determination of heat stability according to ISO 3248/98 “Paints and VarnishesDetermination of heat stability”.
5.2.13 Testing of Odour according to this Gulf Standard
5.2.14 Determination of dry opacity according to this Gulf Standard
5.2.15 Determination of colour fastness to light according to ISO 2809/76
5.2.16 Determination of resistance to biological growth according this Gulf Standard
5.2.17 Determination of durability according to ISO 2810/74
5.2.18 Determination of quantity of material in a container according to ISO 3232/1974
6- PACKING
The paints shall be packed in suitable, clean air-tight containers, the containers shall be
filled as to have an ullage for 15% maximum.
The allowed tolerance should be + 2 % of the content.
7- LABELLING
Each container shall be legibly and indelibly marked in Arabic at least by the following
information:
-
The name and the type of the paint. A or B or C. as classified
The word “Un whashable” for paints with scrub resistance less than 80 scrub
cycles.
The word “Un whashable” for paints with scrub resistance less than 80 scrub
cycles.
The colour of the paint should be shown on the container.
The name of the manufacturer or his trade mark.
Country of origin .
If the paints manufacture is under licence it should be mentioned.
Batch number
Paints/C.driver
-
Date of production (month-year).
Volume in litre of the paint in the container.
Application instruction.
Any warning information concerning the paint.
Warning:
Do not use this container for keeping food stuff.
The number of this standard.
8- ACCEPTABNCE AND REJECTIONS
8.1
8.2
Each consignment of paints shall be accompanied with a certificate stating its
compliance with this standard.
In case of non-compliance of the tested sample with any of the following items of this
standards the consignment shall be rejected.
-
8.3
CONSISTENCY
FINENESS
SCRUB RESISTANCE
DRY OPACITY
PACKING
In this case of one or more sample failed to pass one or more of the tests other than
those in item 8.2 a second sample, double in volume of the first one, shall be withdrawn
from, the same come consignment and subjected to all the tests. The consignment shall
be considered complying when the second sample pass all the requirement shall be
considered complying when the second sample pass all the required tests otherwise the
consignment shall be considered not complying.
Paints/C.driver