Determination of impact resistance of coating films
1 Scope
This standard specifies the test method for determining the impact resistance of coating films by the maximum height (in cm) of the hammer of a fixed mass falling on the punch without causing any coating film damage when the punch hits the test panel.
This standard is applicable to the determination of impact resistance performance of coating films.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 308.1-2013 Rolling bearings - Balls - Part 1: Steel balls
GB/T 3186 Paints, varnishes and raw materials for paints and varnishes - Sampling
GB/T 9271 Paints and varnishes - Standard panels for testing
GB/T 9278 Temperatures and humidities for conditioning and testing of paint specimens
GB/T 13452.2 Paints and varnishes - Determination of film thickness
GB/T 20777 Paints and varnishes - Examination and preparation of samples for testing
GB/T 37356 Paints and varnishes - Lighting and procedure for visual assessments of coatings
3 Principle
Coat the sample under test to applicable metal substrate, and after curing, drop a hammer of fixed mass from a certain height to impact the punch, so that the coating film and substrate are deformed. It may be forward punching (with coating film upwards) or backward punching (with coating film downwards). By gradually increasing the falling height of the hammer, the numerical points where the coating film is liable to damage are determined.
4 Instruments and equipment
4.1 Impact tester
Foreword i
1 Scope
2 Normative references
3 Principle
4 Instruments and equipment
5 Sample
6 Test panels
7 Test procedures
8 Expression of results
9 Test report
Determination of impact resistance of coating films
1 Scope
This standard specifies the test method for determining the impact resistance of coating films by the maximum height (in cm) of the hammer of a fixed mass falling on the punch without causing any coating film damage when the punch hits the test panel.
This standard is applicable to the determination of impact resistance performance of coating films.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 308.1-2013 Rolling bearings - Balls - Part 1: Steel balls
GB/T 3186 Paints, varnishes and raw materials for paints and varnishes - Sampling
GB/T 9271 Paints and varnishes - Standard panels for testing
GB/T 9278 Temperatures and humidities for conditioning and testing of paint specimens
GB/T 13452.2 Paints and varnishes - Determination of film thickness
GB/T 20777 Paints and varnishes - Examination and preparation of samples for testing
GB/T 37356 Paints and varnishes - Lighting and procedure for visual assessments of coatings
3 Principle
Coat the sample under test to applicable metal substrate, and after curing, drop a hammer of fixed mass from a certain height to impact the punch, so that the coating film and substrate are deformed. It may be forward punching (with coating film upwards) or backward punching (with coating film downwards). By gradually increasing the falling height of the hammer, the numerical points where the coating film is liable to damage are determined.
4 Instruments and equipment
4.1 Impact tester
Contents of GB/T 1732-2020
Foreword i
1 Scope
2 Normative references
3 Principle
4 Instruments and equipment
5 Sample
6 Test panels
7 Test procedures
8 Expression of results
9 Test report
