Standard GB/T 9264-2012 “Paints and varnishes, Evaluation of flow resistance” is a method used to evaluate the flow resistance of coatings (including paints, varnishes and similar coating materials). The standard will be understood and interpreted in this paper.

1. Background and origin of standards

The formulation of the standard follows the rules of GB/T 1.1-2009, and replaces GB/T 9264-1988 “Determination of paint flowability”. Compared to the previous version, this standard has been updated with editorial modifications and technical changes. The development of the standard was proposed by the China Petroleum and Chemical Industry Federation and under the supervision of the National Technical Committee of Standardization of Paints and Pigments (SAC/TC 5). Drafting units include CNOOC Changzhou Paint Chemical Research Institute, Garbaoli Chemical Group Co., LTD., Shandong Lehua Paint Industry Co., LTD.

GB/T 9264 paint and varnish resistance evaluation standard interpretation

2. Scope of application and main content of the standard

The scope of application of this standard has been adjusted from the previous application only to color paint to apply to all liquid coatings. The standard describes in detail two methods for evaluating flow-mount resistance: the use of a graduated flow-mount coater and the use of a spray gun. The standard specifies the operating procedures, test conditions, instrument requirements, and the presentation of results for each method.

3. Methods for evaluating fluidness resistance

Two main methods for evaluating flow-resistance are described in the standard:

Method of using a flow-hung coater with a scale: In this method, the paint is scraped onto the test plate, which is then placed vertically and the maximum wet film thickness at which flow-hung does not occur is recorded. This method is suitable for situations where you want to apply paint using a scrape application, such as a brush application or a roller application.

Method of applying with a spray gun: This method involves spraying the paint evenly on the test plate and then observing whether the flow hang occurs after a certain period of time. This method is suitable for applying paint with a spray gun, such as high-pressure compressed air spray, airless spray with or without air support.

GB/T 9264 paint and varnish resistance evaluation standard interpretation

4. Presentation of test conditions and results

The standard specifies the temperature, humidity and other conditions during the test. For the method using a flow-hung coater with a scale, the reported results include the highest gap depth of unobserved flow-hung and the corresponding actual wet film thickness. For the method using spray gun application, the results are reported as the wet film thickness where no flow hanging is observed.

5. Accuracy and test report

Standards provide data on accuracy and requirements for test reporting. The test report should include the details of the tested product, the test method, the temperature and humidity during the test, the viscosity of the coating and other information to ensure the reliability and consistency of the test.

Through the standard GB/T 9264-2012, we can accurately evaluate the anti-flow performance of the coating, so as to ensure that the coating can achieve the expected effect and quality requirements in practical application.