D-350 Hi-Temp Developer
Technical Data Sheet
Description: D-350 is a hi-temp developer used to enhance penetrant indications on parts
at elevated temperatures, temperatures up to 3500F (176.70C). D-350 is the developer
step in a three part high temperature system (KO-17 hi-temp penetrant and a KO-19 hi-
temp remover are the other materials of the hi-temp system). D-350 complies with low
sulfur and low halogen requirements.
Chemical Properties
Color: White Suspended Particles
Specific Gravity: 0.79
Boiling Point: 1800F (820C)
Companion Products
KO-17 Hi-Temp Penetrant KO-19 Hi-Temp Remover
Packaging
One Gallon Cans Five Gallon Cans
16oz. Aerosol Cans (9 cans per case)
Storage /Shelf Life
Keep away from moisture and sunlight.
Temperature limit: 400F to 1250F (0-500C)
Keep the container closed when not in use.
Shelf life from invoice date: Bulk Container – 36 months / Aerosol Can – 24 months
Specifications
MIL-I-25135 Revisions ASME Code NDT, Sec V
Special Features
1. D-350 can be used to develop indications at elevated temperatures.
2. D-350 meets the ASME code qualification procedure compliance.
3. D-350 meets the requirements for low sulfur and halogen.
1
Instructions
Note: 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 hi-temp KO-17 penetrant by spray or brush to a limited area. The
area to which the penetrant is to be applied should not be too large, so processing can be
completed within penetrant and developer dwell time restraints. The size of the area will
vary with inspection temperatures, part geometry, and operator experience.
2. Dwell: The penetrant must be allowed to dwell on the part surface to promote the
penetrant time to enter any surface flaws. At higher temperatures, penetration occurs
more quickly.
2250 – 3500 F (107.20C – 176.70C) 30 seconds
175 – 225 F (79.4 C – 107.2 C)
0 0 0 0 1-2 minutes
1250 – 1750F (51.70C – 79.40C) 2-3 minutes
75 – 125 F (23.9 C – 51.7 C)
0 0 0 0 3-10 minutes
500 – 750F (100C – 23.90C) 10-30 minutes
Allowances must be made for contamination levels and flaw sizes.
3. Removal: Wipe the surface with paper or soft clean cloth towels to remove as much
KO-17 as possible from the surface part. Spray KO-19 remover directly onto the surface of
the part in a thin coat and immediately wipe from the part surface. The part is then wiped
with a water saturated towel or cloth to remove the last traces of penetrant. Finally a dry
wipe is used to remove any water from the part.
4. Drying: Use paper or cloth toweling to dry the part’s surface thoroughly. Extra drying
time before applying developer to heated parts should not be required.
5. Developing: D-350 developer should be sprayed on the part surface from a distance of
6-8 inches immediately after the excess penetrant has been removed and the part has
dried. Apply a thin even coat, two or three thin coats are preferred to a single, heavy coat.
6. Inspection: Observe the surface for defect indication formation while the developer is
applied. Final surface examination should begin within a minute or two after developer
application. Surface examination should be completed as quickly as practical, and within
ten or fifteen minutes.
Health & Safety
D-350 hi-temp penetrant should be used with adequate ventilation and away from sparks,
flame, since it is applied to heated surfaces. Wear protective clothing and equipment.
Avoid prolonged or repeated contact with skin. Do not take internally. Consult the MSDS
for more safety and health information.
