Standard No.:	GB/T 1731-2020
English Name:	Determination of flexibility of coating and putty films
Chinese Name:	漆膜、腻子膜柔韧性测定法
Chinese Classification:	G50    Basic standard and general method for coating
Professional Classification:	GB    National Standard
Issued by:	AQSIQ and SAMR
Issued on:	2020-11-19
Implemented on:	2021-10-1
Status:	valid
Superseding:	GB/T 1731-1993 Determination of flexibility of films GB/T 1748-1979 Method of test for flexibility of putty coatings
Language:	English
File Format:	PDF
Word Count:	5500 words
Price(USD):	150.0
Delivery:	via email in 1 business day

Determination of flexibility of coating and putty films 1 Scope This standard specifies the determination of flexibility of coating and putty films by using a flexibility tester, and the flexibility of coating and putty films is expressed by the minimum shaft diameter at which the coating and putty films will not be damaged. This standard is applicable to the determination of flexibility of coating and putty 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 of the referenced document (including any amendments) applies. 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 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 flexibility capability of coating or putty films to deform along with its substrate without damage 4 Determination of flexibility of coating 4.1 Apparatus 4.1.1 Coating flexibility tester The coating flexibility tester consists of seven shafts with different diameters or curvature radii, which are fixed on the base. The schematic diagram is shown in Figure 1, and the sectional views of shafts 5, 6 and 7 of the coating flexibility tester are shown in Figure 2. The dimensions of each shaft are as follows: ——Shaft 1: about 35mm in length and mm in diameter φ; ——Shaft 2: about 35mm in length and mm in diameter φ; ——Shaft 3: about 35mm in length and mm in diameter φ; ——Shaft 4: about 35mm in length and mm in diameter φ; ——Shaft 5: about 35mm in length, about 10mm in height, 3mm in thickness and (1.5±0.1)mm in curvature radius R (3mm in diameter φ);

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Determination of flexibility of coating 5 Determination of flexibility of putty films 6 Test report