4.1 Primers and primer surfacers may be used over many different surfaces top coated with one or more of a variety of coatings and subjected to many kinds of wear and exposure.

4.2 The selection of the tests to be used for any given product or system must be governed by experience and by the requirement agreed upon between the producer and the user.

1.1 This practice covers the selection and use of procedures for testing primers and primer surfacers. The test methods included are listed in Table 1.

TABLE 1 Test Methods

Property

Section

ASTM Method

Federal Test
Method Specification No. 141B

Abrasion resistance:

 Air blast abrasion tester
 Falling sand method

6.2
6.2

D658
D968

...
6191

Adhesion:

 Scrape adhesion

6.3

D2197

6303.1

 Parallel-groove adhesion

6.3

D2197

6302.1

 Tape adhesion

6.3

D3359

...

Chemical resistance:

 Household chemical resistance

6.4.2

D1308

...

 Detergent resistance

6.4.3

D2248

 Hydrocarbon resistance

6.4.4

...

6011

Chip resistance

6.5

D3170

...

Color difference:

 Visual evaluation
 Instrumental evaluation

6.6
6.6

D1729
D2244

4249.1
6123

Cracking resistance

6.7

D2246

...

Elongation:

 Conical mandrel
 Cylindrical mandrel

6.8
6.8

D522
D1737

...
...

Filiform corrosion

6.9

D2803

...

Gloss

6.10

D523

6101

Hardness

6.11

D1474

...

Holdout

6.12

C540

...

Mildew resistance

6.13

...

6271.1

Outdoor exposure:

 Blistering

6.14.2

D714

6461

 Cracking

6.14.2

D661

6471

 Rusting

6.14.2

D610

6451

 Checking

6.14.2

D660

6421

Print resistance

6.15

D2091

...

Salt spray resistance

6.16

B117

6061

Sanding properties

6.17

...

6321

Water resistance:

 High humidity
 Water immersion

6.18.2
6.18.3

D1735
D870

...
...

Weldability

6.19

...

^A

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.