6-14_paint_25.pdf

8/17/2019 6-14_Paint_25.pdf

1/6

SSPC-Paint 25

May 1, 1997

Editorial Revisions November 1, 2004

6-81

1. Scope

1.1 This specification covers a slow drying French process

zinc oxide, raw linseed oil and alkyd primer suitable for use

over hand-cleaned steel.

1.2 This primer is suitable for exposures in Environmental

Zones 1A (interior, normally dry) and 1B (exterior, normally dry),

and is intended for brush, roller or spray application over steel

surfaces prepared in accordance with SSPC-SP 2, “Hand Tool

Cleaning,” or better. (See Note 9.6.) Within the limitation stated

in 2.1 it is suitable as a shop primer, field primer, maintenance

primer, or intermediate coat and is to be applied in accordancewith SSPC-PA 1, “Shop, Field, and Maintenance Painting of

Steel.” If the primed part of the structure is to be exposed to

the weather, it should be topcoated as soon as practical.

2. Description

2.1 This specification contains requirements to ensure

barrier inhibition composition. Consequently, performance is

comparable to that customarily expected from paints containing

lead and chromate pigments.

It has good wetting ability, even for non-blast cleaned steel,

about 36 hours drying time (generally it can be recoated after

24 hours, although the coating will not have achieved a throughdry) and good resistance to weathering before field coating.

The good wetting ability of this primer is the result of its high

proportion of raw linseed oil. Type II has a lower percentage of

volatile organic compounds (VOC) than Type I. The reduced

VOC content of Type II was achieved by replacing some of the

mineral spirits with high flash naphtha and by making other

minor composition changes. Details of the compositions are

given in Table 1 for Type I and in Table 2 for Type II.

2.2 The Type I primer contains approximately 65% by

volume of nonvolatile film forming solids (pigment and binder).

The theoretical spreading rate for a 50 micrometer (2.0 mil)

dry film thickness is 12.8 m2/L (520 ft2/U.S. gallon). Actual

spreading rates can be significantly lower. On a calculated

basis, the VOC is 270 g/L(2.3 lb/gal).

2.3 The Type II primer contains approximately 70% by

volume of nonvolatile film forming solids (pigment and binder).

The theoretical spreading rate for a 50 micrometer (2.0 mil)

dry film thickness is 13.8 m2/L (560 ft2/U.S. gallon). Actual

spreading rates can be significantly lower. On a calculated

basis, the VOC content is 240 g/L (2.0 lbs/gal).

SSPC: The Society for Protective Coatings

PAINT SPECIFICATION NO. 25Zinc Oxide, Alkyd, Linseed Oil Primer for Use Over Hand Cleaned Steel

Type I and Type II

3. Referenced Standards

3.1 The latest issue, revision, or amendment of the refer-

enced standards in effect on the date of invitation to bid shall

govern, unless otherwise specified. Standards marked with

an asterisk (*) are referenced only in the Notes, which are not

requirements of this specification.

3.2 If there is a conflict between the requirements of any

of the cited referenced standards and this specification, the

requirements of this specification shall prevail.

3.3 SSPC STANDARDS AND JOINT STANDARDS:

Guide 13 Guide for the Identification andUse of Industrial Coating Material

in Computerized Product Data-bases

* Guide 7 Guide for the Disposal of Lead-

Contaminated Surface PreparationDebris

PA 1 Shop, Field, and MaintenancePainting of Steel

SP 2 Hand Tool Cleaning*SP 3 Power Tool Cleaning

* SP 5/NACE No. 1 White Metal Blast Cleaning

*SP 6/NACE No. 3 Commercial Blast Cleaning*SP 7/NACE No. 4 Brush-Off Blast Cleaning

SP 8 Pickling*SP 10/NACE No. 2 Near-White Metal Blast

Cleaning

*SP 11 Power Tool Cleaning to BareMetal

*SP 12/NACE No. 5 Surface Preparation and Cleaningof Metals by Watejetting Prior to

Recoating

* SP 15 Commercial Grade Power ToolCleaning

3.6 ASTM INTERNATIONAL STANDARDS:

D 79 Specification for Zinc Oxide

D 185 Test Method for Coarse Particles in Pigments,Pastes and Paints

D 234 Specifiation for Raw Linseed Oil D 235 Specification for Mineral Spirits (Petroleum

Spirits) (Hydrocarbon Dry Cleaning Solvent)

D 522 Standard Test Methods for Mandrel BendTest of Attached Organic Coatings

D 562 Test Method for Consistency of PaintsMeasuring Krebs Unit (KU) Viscosity Using

a Stormer-type Viscometer

Main MenuTable of

Contents

http://../SSPCSTANDARDS2005.pdfhttp://../Misc/Front03TOC.pdfhttp://../Misc/Front03TOC.pdfhttp://../Misc/Front03TOC.pdfhttp://../SSPCSTANDARDS2005.pdf

8/17/2019 6-14_Paint_25.pdf

2/6

SSPC-Paint 25

May 1, 1997


6-82

D 600 Specification for Liquid Paint Driers

D 605 Specification for Magnesium Silicate Pig-

ment (Talc) D 607 Specification for Wet Ground Mica Pig-

ments D 1208 Test Methods for Common Properties of

Certain Pigments

D 1210 Test Methods for Fineness of Dispersionof Pigment-Vehicle Systems by Hegman-

type Gage D 1296 Test Method for Odors of Volatile Solvents

and Diluents

D 1475 Test Method for Density of Liquid Coatings,Inks, and Related Products

D 1542 (Withdrawn) Test Method for QuantitativeTest for Rosin in Varnishes

D 1640 Standard Test Methods for Drying, Curing,or Film Formation of Organic Coatings at

Room Temperature

D 2369 Test Method for Volatile Content of Coatings D 2371 Test Method for Pigment Content of Solvent-

Reducible Paints

* D 2448 Test Method for Water-Soluble Salts in Pig-ments by Measuring the Specific Resistance

of the Leachate of the Pigment D 2832 Standard Guide for Determining Volatile

and Nonvolatile Content of Paint and RelatedCoatings

D 3278 Test Methods for Flash Point of Liquids by

Small-Scale Closed-Cup Apparatus

D 3722 Specification for Natural Red and BrownIron Oxide Pigments

D 3724 Specification for Synthetic Brown Iron OxidePigment

D 3734 Specification for High-Flash Aromatic

Naphthas D 3925 Practice for Sampling Liquid Paints and

Related Pigmented Coatings D 3951 Practice for Commercial Packaging

D 4400 Test Method for Sag Resistance of Paints

Using a Multinotch Applicator

3.7 FEDERAL SPECIFICATIONS AND STANDARDS:

TT-R-266 Resin, Alkyd: Solutions

FED-STD-141 Paint, Varnish, Lacquer and Related Ma-

terials: Methods of Inspection, Sampling and Testing

Method 3011 Condition in ContainerMethod 3021.1 (Canceled) Skinning (Partially Filled

Container)

Method 4203 Reducibility and Dilution Stability

Min. Max.INGREDIENTS Wt. % Wt. % Wt. % Vol. % ASTM Federal

PIGMENT1 (52.5 ± 2 wt. %)Zinc Oxide 15.0 17.08. 8.4 2.2 D 79, Dry Pigment,

French Process

Iron Oxide (85% minimum Fe2O

3) 39.0 --- 21.5 7.9 D 3722/D 3724 ---

Magnesium Silicate --- 33.0 17.3 9.1 D 605 ---

Mica 10.0 12.0 5.3 2.7 D 607 ---TOTAL PIGMENT 52.5 21.9

VEHICLE: (47.5 ± 2 wt. %)Raw Linseed Oil 30.5 --- 14.5 23.2 D 234 ---

Alkyd Resin Solids 30.5 --- 14.5 19.8 --- TT-R-236,Type I, Class A

Type II, Class BMineral Spirit Thinner --- 39.0 18.5 35.0 D 235 ---

Driers --- --- --- --- D 600, Non-Lead ---

TOTAL VEHICLE: 47.5 78.0

TOTAL: 100 100 100

The preblended composite pigment shall comply with the following:

PROPERTY METHOD REQUIRED

pH --- 7 to 8

Specific Resistance of Leachate ASTM D 2448 5000 ohm-cm minimum

1 see Note 9.3 for supplier of preblended pigment and Note 9.4 for properties of component pigments.

TABLE 1

COMPOSITIONSSPC-Paint 25, Type I

8/17/2019 6-14_Paint_25.pdf

3/6

SSPC-Paint 25

May 1, 1997


6-83

Method 4321 Brushing Properties

Method 4331 Spraying Properties

Method 4541 (Canceled) Working Properties and

Appearance of Dried Film

3.8 AMERICAN NATIONAL STANDARDS INSTITUTE

(ANSI) STANDARD:

ANSI Z129.1 Hazardous Industrial Chemicals

—Precautionary Labeling

4. Composition

4.1 Ingredients and proportions shall be as specified in

Table 1 for Type I and in Table 2 for Type II.

4.2 The primers based on the specified ingredients shall

be uniform, stable in storage, and free from grit and coarse

particles. No rosin or rosin derivatives may be used. Beneficial

additives such as anti-skinning agents, suspending agents, or

wetting aids may be added.

4.3 The paint shall conform to the composition (analysis)

requirements of Table 3.

5. Properties

5.1 The primers for Type I and Type II shall meet the require-

ments of Tables 3 and 4 and of Sections 5.2 through 5.8.

5.2 ODOR: Shall be normal for the materials permitted

(ASTM D 1296).

5.3 COLOR: The color shall be typical of the specified

mixture of zinc oxide and red or brown iron oxide.

PIGMENT*: (54.0 ± 2 wt. %)

Zinc Oxide 15.0 17.0 8.6 2.4 D 79, Dry Pigment, —

French ProcessIron Oxide (85% minimum Fe

20

3) 39.0 — 22.2 8.3 D 3722/D 3724 —

Magnesium Silicate — 33.0 17.8 9.7 D 605 —

Mica 10.0 12.0 5.4 2.9 D 607 —TOTAL PIGMENT: 100 54.0 23.3

VEHICLE: (46.0 ± 2 wt. %)

Raw Linseed Oil 30.5 — 15.3 25.5 D 234 —

Alkyd Resin Solids 30.5 — 15.3 21.7 — TT-R-266, Type I Class A

Type II Class BMineral Spirit Thinner — 22.9 10.5 20.8 D 235 —

High Flash Naphtha — 10.7 4.9 8.7 D 3734 —

Driers — — — — D 600, Non-Lead —

TOTAL VEHICLE: 100 46.0 76.7

TOTAL: 100 100

The preblended composite pigment shall comply with the following:

PROPERTY METHOD REQUIRED

pH — 7 to 8

Specific Resistance of Leachate ASTM D 2448 5000 ohm-cm minimum

* See Note 10.3 for supplier of preblended pigment and Note 10.4 for properties of component pigments.

TABLE 2

COMPOSITIONSSPC-Paint 25.1, Type II

TYPICAL REQUIRED COMPOSITION INGREDIENT STANDARDS

Min. Max.

INGREDIENTS Wt. % Wt. % Wt. % Vol. % ASTM FEDERAL

8/17/2019 6-14_Paint_25.pdf

4/6

SSPC-Paint 25

May 1, 1997


6-84

5.4 COMPATIBILITY: There shall be no evidence of

incompatibility of any of the ingredients of the paint when two

volumes of the paint are slowly mixed with one volume of

mineral spirits (FED-STD-141, Method 4203).

5.5 WORKING PROPERTIES: The paint shall be easily

applied by brush, roller, or spray when tested in accordance

with FED-STD-141, Methods 4321, 4331, and 4541. The paint

shall show no streaking, running, or sagging during application

or while drying.

5.6 CONDITION IN CONTAINER: The paint shall show

no thickening, curdling, gelling, or hard caking when tested

as specified in FED-STD-141, Method 3011, after storage for

six months from the date of delivery, in a full, tightly covered

container, at a temperature of 10-43°C (50-110°F).

5.7 SKINNING: There shall be no skinning in a three-

quarters filled closed container after 48 hours when tested

in the standard manner specified in FED-STD-141, Method

3021.

REQUIREMENTS

Min. Max.CHARACTERISTICS Wt. % Wt. % ASTM FED-STD-141

TABLE 3

ANALYSIS

Pigment content Type I 50.5 54.5 D 2371 —

Type II 52.0 56.0 D 2371 —

Volatiles

Type I — 19.3 D 2369 —

Type II — 16.1 D 2369 —

Nonvolatile vehicle

Type I 27.8 — — —

Type II 26.8 — — —

Uncombined water — 1.0 D 1208 —

Coarse particles and skins,

as retained on standard

325 mesh screen — 1.5 D 185 —

Rosin or rosin derivatives — 0 D 1542 —

REQUIREMENTS

CHARACTERISTICS Min. Max. ASTM FED-STD-141

TABLE 4

PROPERTIES

Consistency* shear rate 200 rpm

Grams 175 225 D 562 —

Krebs units 77 86 D 562 —

Density, kg/L (lb/US gal)

Type I 1.48 (12.3) — D 1475 — Type II 1.54 (12.8) — D 1475 —

Fineness of grind, Hegman units 3.0 — D 1210 —

Drying time, hours

Tack free — 20 — 4061

Dry hard — 36 — 4061

Flash point, °C (°F) 38 (100) — D 3278 —

Sag resistance, mm (mils) 0.18 (7) 0.25 (10) D 4400 —

* Consistency 48 hours or more after manufacture.

8/17/2019 6-14_Paint_25.pdf

5/6

SSPC-Paint 25

May 1, 1997


6-85

5.8 SALT CONTAMINATION: Content of salt contami-

nation shall have been minimized by the incorporation of only

high purity materials. The specific resistance of the aqueous

leachate of the composite of the pigments in required propor-

tions shall be a minimum of 5,000 ohm-cm when tested in

accordance with ASTM D 2448.

6. Labeling

6.1 Labeling shall conform to ANSI Z129.1.

6.2 Technical data shall be provided for at least all data

elements categorized as “essential” in SSPC-Guide 13.

6.3 MARKING OF CONTAINERS: Each container shall

be legibly marked with the following information:

Name: Zinc Oxide, Alkyd, Linseed Oil Primer for Use

Over Hand Cleaned Steel, Type I (or Type II)

Specification: SSPC-Paint 25

Color: Red or Brown Iron Oxide

Lot Number:

Batch Number:

Stock Number:

Date of Manufacture:

Quantity of Paint in Container:

Information and Warnings as may be required by

Federal and State Laws:

VOC Content:

Manufacturer's Name and Address:

6.4 PACKAGING: Material shall be packaged and labeled

in accordance with the requirements of ASTM D 3951 unlessotherwise specified.

6.5 DIRECTIONS FOR USE: The following directions

for use shall be supplied with each container of paint:

Directions for Use of Zinc Oxide,

Alkyd, Linseed Oil Primer for Use Over

Hand Cleaned Steel

This paint is intended for use as a primer over hand cleaned

steel in atmospheric exposure; it will perform better if the steel

is power tool cleaned, blast cleaned, or pickled. All rust scale,

loose rust, loose mill scale, and loose or non-adherent paintshall be removed; oil and grease shall be removed to the full-

est extent practical, as residues of oil and grease remaining

on the surface will result in decreased paint performance.

Mix paint thoroughly before use. If the pigment has set-

tled, pour off most of the liquid. Thoroughly mix the pigment

with the remaining liquid, taking care to scrape all the pigment

off the bottom of the can. Gradually add the poured-off liquid

and mix thoroughly. Mixing may be made easier by transfer-

ring the contents to a larger container or by pouring the paint

to and from another container. Examine bottom of container

for unmixed pigment. Screen paint before applying.

The thinning of paint will change the VOC level. For roller,

brush, or airless spray application, no thinning should be nec-

essary. A minimum amount of thinning may be necessary for

conventional air spray.

Apply by brush or spray to the specified film thickness

or, if none is specified, to at least 50 micrometers (2 mils) dry

or approximately 75 micrometers (3 mils) wet. The surface to

be painted shall be dry, the surface temperature shall be at

least 3 C° (5 F°) above the dew point and the temperature of

the air shall be over 4°C (40°F). Do not paint outdoors in rainy

weather or if freezing temperatures are expected before the

paint dries.

Allow paint at least 24 hours drying time before recoating.

7. Inspection

7.1 All materials (coatings) supplied under this specifica-

tion are subject to timely inspection by the purchaser or hisauthorized representative. The purchaser shall have the right

to reject any materials supplied which are found to be defective

under this specification. (see Note 9.1). In case of dispute, un-

less otherwise specified, the arbitration or settlement procedure

established in the procurement documents shall be followed.

If no arbitration procedure is established, then a procedure

mutually agreeable to the purchaser and material supplier shall

be used.

7.2 Samples of paints may be requested by the purchaser

and shall be supplied upon request along with the manufac-

turer’s name and identification for the materials. Samples may

be requested at the time the purchase order is placed or maybe taken from unopened containers at the job site.

7.3 Unless otherwise specified, the sampling shall be in

accordance with ASTM D 3925.

8. Disclaimer

8.1 While every precaution is taken to ensure that all

information furnished in SSPC standards and specifications is

as accurate, complete, and useful as possible, SSPC cannot

assume responsibility nor incur any obligation resulting from

the use of any materials, coatings, or methods specified herein,

or of the specification or standard itself.

8.2This specification does not attempt to address problems

concerning safety associated with its use. The user of this

specification, as well as the user of all products or practices

described herein, is responsible for instituting appropriate

health and safety practices and for ensuring compliance with

all governmental regulations.

8/17/2019 6-14_Paint_25.pdf

6/6

SSPC-Paint 25

May 1, 1997


6-86

9. Notes

Notes are not a requirement of this specification.

9.1 The procurement documents should establish the

responsibility for samples, testing, and any required affidavit

certifying full compliance with the specification.

9.2 The extraction of chlorides and other anions from

corrosion pits in severe corrosivity areas of the structure is

recommended.

9.3 The preblended composite pigment can be obtained

from Hoover Color Corporation, P. O. Box 218, Hiwasse, VA

24347; Phone (703) 980-7233.

9.4 During the development of SSPC-Paint 25, the purity

of each pigment was measured in accordance with ASTM D

2448. The specific resistances of the leachate for the individual

pigments were as follows:

French process zinc oxide .......20,000 ohm-cm

Iron oxide ................................. 5,000 ohm-cm

Magnesium silicate ...................2,800 ohm-cm

Mica ..........................................17,000 ohm-cm

The calculated resistance for the formula blend using

these purities for the individual paints is 5000 ohm-cm.

9.5 Handle wastes in accordance with federal, state and

local government regulations. See SSPC-Guide 7, “Guide

for the Disposal of Lead-Contaminated Surface Preparation

Debris.”

9.6 The following degrees of surface preparation are better

than SSPC-SP 2, “Hand Tool Cleaning”: SSPC-SP 3, SSPC-SP

5/NACE No. 1, SSPC-SP 6/NACE No. 3, SSPC-SP 7/NACE

No. 4, SSPC-SP 8, SSPC-SP 10/NACE No. 2, SSPC-SP 11,

SSPC-SP 12 /NACE No. 5, SSPC-SP 15.

9.7 Type I of this specification very closely matches the

previous version of SSPC-Paint 25.

6-14_paint_25.pdf

Documents