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JIS G3491 is an important specification in Japanese industrial standards that involves coating testing, mainly used to evaluate the integrity of surface coatings on metal materials.
keyword JIS G3491 Category Anti-coating pipe standards Related products Get a quoteJIS G3491 coated anti-corrosion steel pipe
JIS G3491 is an important specification in Japanese industrial standards that involves coating testing, mainly used to evaluate the integrity of surface coatings on metal materials. This standard is often applied in the testing process of equipment such as spark detectors and insulation defect detectors, and the coating has no defects such as pinholes or cracks. For example, in the insulation testing of electrosurgical instruments, JIS G3491 and JIS G3492 jointly specify the testing requirements for the integrity of insulation materials to prevent accidental burns caused by current leakage.
Testing methods and equipment
According to JIS G3491 standard, coating defect detection usually adopts wet sponge testing technology or high-voltage electric discharge testing technology. The wet sponge method is suitable for thinner coatings. By applying low voltage through the wet sponge, a current loop is formed and an alarm is triggered when the liquid penetrates into the substrate defect; The high voltage rule is applicable to coatings with a thickness of up to 7mm. Defects will appear in the form of electric sparks when scanned by a DC high voltage probe on the surface. Related equipment such as the Engel 236 porosity detector supports this type of standard testing and is equipped with visual and audible alarm functions.
Correlation with other standards
JIS G3491 is often combined with international standards such as JIS G3492 and ANSI/AWWAC214-89 to form a complete coating quality control system. For example, in pipeline anti-corrosion coating testing, JIS G3491 and ANSI/AWWAC214 jointly specify the threshold for determining pinholes and pores, while JIS G3492 supplements the testing conditions for specific materials. This multi standard collaborative application ensures the accuracy and comparability of detection results in different scenarios.
Standard technical details and updates
The JIS G3491-1993 version is an early version of this standard, which specifies the testing parameters and determination methods. Subsequent updates may involve adjustments to the detection voltage range and equipment sensitivity. For example, the standard requires that the high-voltage detection voltage be dynamically adjusted according to the coating thickness. Thin coatings usually use 0.5-15kV, while thick coatings extend to 0.5-30kV to avoid excessive breakdown or missed detection. The relevant technical documents can be obtained through the Japanese Standards Association (JSA) to confirm the revised content.
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