BS EN ISO 12706:2001 pdf – Non-destructive testing Ð Terminology Ð Terms used in penetrant testing.
Definitions 2.1 background Level of fluorescent penetrant or colour contrast penetrant left on the surface of the component after the removal of excess penetrant. 2.2 bath Quantity of liquid -penetrant inspection materials (penetrant, emulsifier, developer) into which parts are immersed during the test. 2.3 bleedout Egress of penetrant from a discontinuity, usually aided by developer. 2.4 colour contrast penetrant Penetrant that is a solution of dyes (typically red) in a liquid base. 2.5 developer Substance which has the property of with-drawing penetrant from discontinuities to make them more easily visible. 2.6 development time Time between application of developer and subsequent examination
2.7 dip rinse Means of removing excess penetrant in which the test parts are dipped into a tank of water which may be agitated. 2.8 dry developer Developer in the form of a fine dry powder used mainly with fluorescent penetrants. 2.9 dual purpose penetrant Penetrant that gives indications which are capable of being viewed either under visible light or UV-A-radiation. 2.10 electrostatic spraying Application of electrically charged particles to an earthed test surface. 2.11 emulsification of penetrant Action of emulsifiers on post emulsifiable pene- trants to render them water-washable. 2.12 emulsification time Period of time that an emulsifier is used to render the post- emulsifiable penetrant water-washable.
2.13 emulsifier Product which makes the post- emulsifiable penetrant water-washable. 2.14 excess penetrant removal Means employed to remove excess penetrant from the test surface, without removing any penetrant from the discontinuities. 2.15 fluorescent intensity Intensity of light emitted in the visible spectrum by the penetrant, when excited by radiation in the UV-A range. 2.16 fluorescent penetrant Penetrant that fluoresces under UV-A radiation. 2.17 hydrophilic emulsifier Water-dilutable remover used in penetrant testing. 2.18 lipophilic emulsifier Oil based emulsifier used in penetrant testing. 2.19 penetrant testing Non-destructive test typically comprising a penetrant，a method of excess removal and a developer to produce a visible indication of surface-breaking discontinuities.
2.20 peelable developer Liquid developer which, on evaporation, leaves a thin removable film which retains any indication and can be used to obtain archivable replicas. 2.21 penetration time Interval comprising penetrant application time plus drain time, during which the penetrant is in direct contact with the test surface. 2.22 penetrant Liquid which when applied to a component is designed to find its way into surface discontinui- ties and to remain there in detectable amounts during the subsequent removal of excess penetrant from the surface. 2.23 penetrant materials (testing products) Cleaners, penetrants， removers and developers used in penetrant testing. 2.24 post cleaning The removal of penetrant material residues from the test part affter the penetrant testing process has been completed.
2.25 post emulsifiable penetrant Penetrant that requires the application of a separate emulsifier to render it water-washable. 2.26 precleaning Removal of contaminants from the test surface. 2.27 product family Compatible group of penetrant, remover and developer. 2.28 reference block Test piece with known discontinuities, either natural or artificial, used to determine and/or compare the sensitivity of penetrant processes and to check their reproducibility. 2.29 rinse Process of removing excess penetrant from the surface by means of washing or flooding with the relevant excess penetrant remover, usually water. 2.30 sensitivity Measure of the ability of a penetrant testing process to detect discontinuities.
2.31 sensitivity level (of a penetrant inspection process) Grading of sensitivity of a given penetrant testing process. 2.32 solvent based developer ; Nonaqueous wet developer Developer consisting of fine particles in a solution with a volatile solvent. 2.33 solvent-removable penetrant Penetrant that requires the application of a suitable solvent to remove the excess surface. 2.34 solvent remover Organic liquid used to remove excess penetrant from the test surface. 2.35 water soluble developer (aqueous) Product dissolved in water which when dry forms an absorbant coating. 2.36 water suspendable developer (aqueous) Product dispersed in water, which dries to an absorptive coating.