KS 1992:2005
KENYA STANDARD
Two pack epoxy zinc phosphate weldable primer—Specification
Public Review Draft
December 2005
KENYA BUREAU OF STANDARDS (KEBS)
KENYA STANDARD
KS 1992:2005
TECHNICAL COMMITTEE REPRESENTATION
The following organizations were represented on the Technical Committee:
Jotun paints ltd.
Sadolin Paints (E.A.) Ltd.
Unique supplies.
Kenya Ferry Services
Crown-Berger Ltd.
Government Chemist’s Department
Kenya Ports Authority
SAJCO paints company
Southern engineering company ltd (SECO)
Galaxy paints ltd
Kenya Bureau of Standards — Secretariat
REVISION OF KENYA STANDARDS
In order to keep abreast of progress in industry, Kenya standards shall be regularly reviewed. Suggestions
for improvement to published standards, addressed to the Managing Director, Kenya Bureau of Standards,
are welcome.
© Kenya Bureau of Standards, 2005
Copyright. Users are reminded that by virtue of section 6 of the Copyright Act, Cap. 130 of the laws of
Kenya, copyright subsists in all Kenya Standards and except as provided under section 7 of this act, no
Kenya Standard produced by Kenya Bureau of Standards may be reproduced, stored in a retrieval system in
any form or transmitted by any means without prior permission in writing from the Managing Director.
KENYA BUREAU OF STANDARDS (KEBS)
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iii
KENYA STANDARD
KS 1992:2005
Foreword
This Kenya Standard has been prepared by the Technical Committee on Paints and Allied Products under
the supervision of the Chemical Industry Standards Committee, and it is in accordance with the procedures
of the Bureau.
Epoxy based paint is required for the painting of steel structures and equipments for shore based equipment.
This type of primer is used as a base coat in epoxy painting system and will have no deleterious effect on
welding..
This standard specifies such important parameters like volatile matter, drying times, pot life and skinning
among others. The standard covers all range of colours
During the preparation of this standard, reference was made to;
IS 14209— epoxy zinc phosphate weldable primer, two component specification
Acknowledgment is hereby made for the assistance derived from this source
© KEBS 2005 — All rights reserved
iv
KENYA STANDARD
KS 1992:2005
Two pack epoxy zinc phosphate weldable primer—Specification
1
Scope
This Kenya Standard prescribes the requirements and test methods for two pack epoxy zinc phosphate
weldable primer. This material is used as a base coat for the painting of steel structures /equipment where
corrosion protection and chemical resistance under marine atmospheric conditions are required.
.
2
Normative references
The following publications are indispensable in the application of this standard:
KS 161-4, Paints and varnishes — Determination of specific gravity or weigh/litre
KS ISO 4618-1, Paints and varnishes — Terminology
KS 161-5, Methods of test for paint, varnishes, lacquers and enamels-Determination of
volatile and non volatile matter
KS 163, Colours of ready mixed paints
KS 161-2, Methods of test for paint, varnishes, lacquers and enamels-Standard panels
for testing
3
Definitions
For the purposes of this standard, the definitions given in KS ISO 4618-1 apply together with the following
glossary of terms related to paint.
3.1 Pot life
Maximum time during which a coating material supplied as separate components should be used after they
have been mixed together.
4
Requirements
4.1
Composition
4.1.Two pack epoxy zinc phosphate weldable primer shall be epoxy based. The manufacturer shall specify
the principal type of binder and the curing agent used in the paint. The principal anticorrosive pigment shall
be zinc phosphate
4.1.The paint shall consist essentially of two components, base and hardener or catalyst solution to be
mixed as recommended by the manufacturer so as to satisfy all the requirements of this standard.
4.2
Odour
The odour of the Two-pack epoxy zinc phosphate weldable primer in the container, during and after
application shall not be abnormally pungent, offensive or disagreeable.
© KEBS 2005 — All rights reserved
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KENYA STANDARD
4.3
KS 1992:2005
Condition of material in container
When visually examined, Two pack epoxy zinc phosphate weldable primer shall be free from skins and
lumps. The container shall be free from rust and moulds.
4.4 Other requirements
4.4.1 Wet paint
The wet mixed material shall also comply with the requirements given in the Table 1 below:
Table 1 — Requirements for the wet coat, Two pack epoxy zinc phosphate weldable primer
Item no
1)
Characteristic
Requirements
2)
Drying time
a) Surface dry
b) Hard dry
Viscosity1at 25oC Pa.s
4 hours, maximum
24 hours, maximum
68 - 72 KU
3)
4)
5)
Solids content, % m/m
Pot life, hours.
Flash point
35, minimum
4, maximum.
30 0c, minimum.
6)
7)
Specific gravity at 25 oC
Wet opacity
8)
Zinc phosphate content, min
1.25-1.55
30m
15%
Test method
KS 909 Annex F
Use the rotation paddle
viscometer
KS 161 Part 5
Annex A
KS 161 part 17
KS 161 Part 4,
KS 1275 Annex B
Annex B
4.4.2 Dry coat2
1
Viscosity units.
To change viscosity units from KU (Krebs unit) to mPa.s or cP the following formula shall apply:
Viscosity range of 200-2100 mPa.s (cP)
ln (KU)=1.1187+0.8542*ln (0.1938v +36)-0.0443(ln (0.1938v +36) )2
Viscosity range of 2100-5000 mPa.s (cP)
ln (KU)=1.18118+0.596*ln (0.1938v +36)-0.0206(ln (0.1938v +36) )2
Where KU is the viscosity in Krebs units at 250
and v is the viscosity in mPa.s (cP) at 250
2
Tests mentioned 4.42 shall be carried out for the full system that is
© KEBS 2005 — All rights reserved
6
KENYA STANDARD
KS 1992:2005
Table 2— Requirements for the dry coat, Two pack epoxy zinc phosphate weldable primer.
Item no
Characteristic
Requirements
Test method
KS 163
Mikro test method
Visual examination
1)
Colour
2)
Dry film thickness per coat
Close match with the colour
in the Kebs universal colour
chart.
15-25µm,
3)
Finish
Matt
4)
Scratch hardness using
15N.
Flexibility and adhesion
using 12mm mandrel.
No such scratches shall
produce a bare metal
There shall be no visible
damage or detachment of
film after 48 hours.
KS 161 part 19
Salt spray test
The film shall not show
signs of blistering, staining
,loss of adhesion or creep of
corrosion from scratch
KS 161 part 15
5)
6)
KS 161 part 16
Sampling
4.19
A minimum representative sample of 2L of paint shall be taken randomly from the factory, market or
elsewhere and tested for compliance with the requirements of the standard.
5
Packaging and marking
5.1
Packaging
The paint shall be packed in suitable containers in the following measurers: 20 L, 4 L, 2.5 L, 1 L, ½ L and ¼
L.
5.2
Marking
5.2.1
Marking on the container
Each container shall be marked legibly and indelibly with the following:
a) the words Two pack epoxy zinc phosphate weldable prime
a) name and address of the manufacturer and/or registered trader mark;
b) volume of the material in L;
c)
instructions for use;
d) spreading capacity in M2/L
1 coat of primer, 1 coat of intermediate and 1 coat of finishing paint or 1 coat of primer and 1 coat of finishing paint supplied by the same
firm after 168 hours curing at 30°C.
© KEBS 2005 — All rights reserved
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KENYA STANDARD
KS 1992:2005
e) Shelf life.
5.2 Marking on the label of the container
a) Date of manufacture
b) Instructions for correct use, disposal and safety requirements.
c) Pot-life
d) Shelf life
f)
colour;
g) Batch number
© KEBS 2005 — All rights reserved
8
KENYA STANDARD
KS 1992:2005
Annex A
(normative)
Determination of pot life
A.0
General
The time taken to double the viscosity from the original value shall be considered the pot life of the material .
A.1 Apparatus
A.1.1
Test panels
A.2
Reagents
A.2.1
Component parts i.e. base and hardener or catalyst.
A.3
Procedure
A.3.1 Thoroughly mix component parts in the ratio specified by the paint manufacturer to give a sample of
200 ml by volume.
A.3.2
Within 10 minutes of mixing determine the viscosity using a rotating paddle viscometer.
A.3.3 Allow the mixed sample of paint to stand in a suitable airtight container and determine viscosity at
the end of the specified time.
.
A.4
A.4.1
.
Report
Report whether viscosity has doubled at 25 0c within 4 hours.
© KEBS 2005 — All rights reserved
9
KENYA STANDARD
KS 1992:2005
Annex B
(normative)
Zinc phosphate content
B-O GENERAL
Metallic zinc is estimated, by determining the total reducing power by dissolving it in acidulated ferric chloride
solution and titrating with standard potassium permanganate solution.
B-l REAGENTS
B - 1.1 Standard Potassium Permanganate Solution (0.1 N)
Heat 5 g of potassium permanganate (KmnO4) for one hour at 100 +20C. Dissolve 3.16 g of Potassium
permanganate in water and dilute it to one litre. Allow it to stand for 7 days. Filter through a medium porosity
fritted disc and standardize against sodium oxalate as follows:
Dissolve 0.25 to 0.30 g of sodium oxalate in 250 ml of hot water (80-9O0C) and add 15 ml sulphuric acid
(1:1). Titrate at once with KMn04 solution stirring the liquid rigorously and continuously. The KMn04 shall not
be added more rapidly than 10 to 15 ml/min and the last 0.5 to 1 ml shall be added drop wise with particular
care to allow each drop to be fully decolourised before the next is introduced. The solution shall not be below
60°C by the time the end point has been reached. Keep the KMn0 4 solution in a brown glass-stoppered glass
bottle and store in a dark place.
B-l.2 Ferric Chloride Solution
Prepare a solution containing 20 g of ferric chloride (FeCl3.6H20) and 20 ml of 20 percent sodium acetate
solution. It is advisable to make up one day’s requirement at a time.
Note: 40 ml are required for each determination.
B-l.3 Sodium Acetate Solution
Dissolve 200 g of anhydrous sodium acetate (NaC2H302) or 332 g of NaC2H302.3H20 in water and dilute to 1
litre.
B-l.4 Zimmerman - Reinhardt Solution
Prepare one litre of solution containing 67 g of manganese sulphate (MnS0 4.4H2O), 130 ml of sulphuric acid
(H2SO4) (sp. gr. 1.84) and 138 ml of phosphoric acid (85 percent).
B-2 PROCEDURE
B-2.1 Weigh 0.2 g of the sample of the pigment. Transfer immediately to a dry 600 ml heavy-wall
Erlenmeyer flask and add 50 ml of the FeCl3 solution. Tightly stopper the flask and agitate constantly for
approximately 15 minutes. As soon as all zinc dust is dissolved, add 50 ml of the Zimmerman – Reinhardt
solution and 250 ml of water. Titrate with 0.1 N KMn04 solution.
B-2.2 Make a blank determination, following the same procedure and using the same amounts of‘ all
reagents except the pigment.
B-3 CALCULATIONS
Calculate the percent of metallic zinc as follows:
Metallic zinc, percent = {(V-B) x N x 0.032 7/ W}
Where:
V = ml of KMn04 solution required titration,
B = ml of KMnO4 solution required for titration of blank
N = normality of the KMn04 solution, and
W = grams of sample used.
© KEBS 2005 — All rights reserved
10
KENYA STANDARD
KS 1992:2005
NOTE - Metallic zinc content determination method ns per
ASTM D 521-28 may be used as an alternate method.
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11