YY/T 0343-2002Liquid penetrant inspection of metallic surgical implants (English PDF)

7.4 Of this Standard identically uses

5.1.4 of ASTM F601-1992 Standard Practice for Fluorescent Penetrant Inspection of Metallic Surgical Implants. Annex A, Annex B of this Standard are normative.

Annex A provides the acceptable threshold level of discontinuities on the surface of surgical metal implants. Annex B provides penetration testing procedures.

3.1 Inspection conditions

The surface of test specimen shall be clean without any substance to impede liquid penetrant inspection or generate false penetrant indication.

3.1.2 Degreasing2

Before the specimen is added with penetrant, it shall degrease the surface of test specimen. Choose suitable degreasing solvent.

3.1.3 Subsequent inspection3

If there are different penetrants used for subsequent inspection, it shall re-clean the test specimen so as to completely remove the corrosion products in any discontinuities and previously used penetrant residues. The chemical reaction between residual dye-penetrant and fluorescent penetrant shall result in complete or partial quenching of fluorescence.

3.2 Procedure

3.2.2 Inspection procedures5

See Annex B of this Standard.

3.3 Penetrant materials

3.3.3 Cleaning after inspection7

After inspection, remove penetrant and developer. The residual of inspection material shall make specimen react with other factor to generate corrosive effect during use. In order not to interfere with subsequent processes or use requirements, in-time cleaning must be conducted after inspection.

7.1 Penetrant

The gravity detection cycle and maintenance cycle shall be in accordance with the requirements of manufacturer's instructions on use. The fluorescence intensity shall be inspected according to 5.10.5.1 of HB/Z 61-1998.

7.2 Emulsifier

7.2.1 Water content

The water content of oil-based emulsifier must not exceed 10%. Inspection cycle. 30 days for open container; 3 months for closed container. Inspect according to 5.10.5.2 of HB/Z 61-1998.

7.3 Photographic developer Dry powdered

photographic developer shall be dry, loose and non-caking. Caked photographic developer must not be used.

7.4 Black light9

Black light is used for fluorescent penetrant inspection. It shall inspect the output power of black light. Black light irradiance at the place 380 mm from black light filter surface shall not be less than 800 µW/cm2.The measurement is in the calibrated black light irradiance. The inspection cycle is one week.

9 5.1.4 in ASTM F601-1992.

A.1 Recommended acceptable limit level

The acceptable and rejection limit level of manufacturer or buyer is related to the shape, size and space of discontinuous defects in the inspection area.

The manufacturer and buyer shall indicate different inspection areas for metallic surgical implants (see A.2).