Description

The properties of penetrant materials that are controlled by AMS 2644 and MIL-I-25135E include flash point, surface wetting capability, viscosity, color, brightness, ultraviolet stability, thermal stability, water tolerance, and _____________________.
Surface ______________ can be defined as the force required to expand (or pull apart) the surface of a liquid.
_______________ Ability. When a liquid comes into contact with a solid surface, the cohesive force responsible for surface tension competes with or is countered by the adhesive force between the liquid molecules and the solid surface.
________________ Action, the tendency for a liquid to penetrate or migrate into small openings, such as cracks, pits, or fissures.
From an application viewpoint, ____________ affects the speed with which a penetrant enters a discontinuity.
Specific ________________ is the ratio of the density of a substance to the density of distilled water usually measured at 60°F (15.6°C). This is also the ratio of the weight of the substance to an equal volume of water.
The developer draws penetrant from defects out onto the surface to form a visible indication, commonly known as ___________-out.
Unlike water washable penetrants (Method A), post e__________________ penetrants will not rinse from part surfaces with water alone. An emulsifier is required.
____________________ emulsifiers are basically detergents that contain solvents and surfactants.
Water ______________ developers consist of a group of chemicals that are dissolved in water and form a developer layer when the water is evaporated away.
Water ___________________ developers consist of insoluble developer particles suspended in water. These developers require frequent stirring or agitation to keep the particles from settling out of suspension.
_______________ vision uses cones and provides colour.
___________________ vision uses only rods to see, objects are visible, but appear in black and white.
________________ vision is the combination of Photopic and scotopic vision.
When performing a fluorescent magnetic particle inspection, the eye must be given time to adapt to the darkness of the inspection booth before beginning to look for indications. Dark ___________________ time of at least one minute is required by most procedures.
When ultraviolet light enters the human eye, the fluid that fills the eye fluoresces. This condition is called ______________ fluorescence, and while it is considered harmless, it is annoying and interferes with vision while it exists.
_________________________ indications are true indications produced by known conditions.
__________________ indications are those which are not associated with a discontinuity of any sort. The most common source of false indications is poor washing of water-washable and postemulsifiable penetrant.

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