Callington Sherwin D-100 – Developer #3

Features

  • D-100 lays on the surface in a thinner, more uniform, more absorbent coating
  • D-100 has superior suspension properties
  • It is easily removed by light brushing or spray water rinse
  • D-100 works well on smooth or rough surfaces
  • D-100 can be used on machined or coated surfaces
  • D-100 can be used with both visible and fluorescent penetrants

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Description

D-100 developer consists of refined white particles suspended in isopropyl
alcohol that produces enhanced sensitivity for locating tight flaws. D-100 developer pulls
flaw-entrapped penetrant to the part surface for display against a white background by
solvent and capillary action. Complies with low sulfur and low halogen requirements.

Additional information

Instructions

These instructions describe the basic process, but they may need to be amended by
the user to comply with applicable specification and/or inspection criteria provided by the
contracting agency
1. Application

Apply the penetrant only to clean, dry surfaces by spraying, flowing,
brushing or dipping
2. Dwell Time

A 10 minute dwell time is suggested, although in many cases five minutes
will suffice. When particularly tight cracks are suspected, or the part is especially critical,
the dwell time may be extended to 30 minutes, or longer. Allow the penetrant to drain
from the part surface back into the penetrant tank to conserve material
3. Removal

Use the appropriate washing method to remove the excess penetrant from
the surface
4. Drying

A re-circulating oven set no higher than 1600F (710C) is suggested. Leave the
part in the oven just long enough to evaporate surface moisture. Drying is improved by
using pressurized air to disperse and remove as much excess water as possible before
placing the part into the oven
5. Developing

After agitating the D-100 suspension, evenly spray a light slightly wet
coating of developer onto the dry surface of a part. An overly wet application will blur
indications; an overly dry application lacks full developing action . Two or three light
applications work better than a single heavy application . Too heavy an application may
conceal indications. If D-100 is to be applied with a paint spray gun, the spray gun should
have a vaporizing tip, the spray tank should be pressurized to 15-30 pounds of pressure
and have a stirrer to keep the powder in suspension
6. Inspection

Inspect parts under appropriate light intensity

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