Export Control
EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.Copyright
© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).Applicability
All
Common Information
TASK 70-38-24-400-504 Ultraviolet (UV) Light-Curable Maskant Procedure
General
This task gives procedures to apply mechanical masks, tape, lacquer, wax, chemical maskants, waterborne maskants, and ultraviolet (UV) light-curable maskants to give part surfaces protection from abrasive blasting, selective plating, chemical processing, painting, or stripping and procedures to remove these mask materials.
In this task, "processing" is a general term for a procedure that does one of these actions to a surface of a part:
NOTE
1. Removes material.
2. Applies material.
3. Changes the surface condition.
Precautions
The shop atmosphere can cause corrosion in some parts. Thus, do not do this procedure too far in advance before processing the part.
Make sure you carefully apply the maskant to prevent removal (stripping) of the plating from other areas of the same part.
Prerequisites
Make sure parts are clean, without oil or grease on them, fully dry, and at approximately room temperature before you apply the maskant.
Wear clean cotton gloves when you touch parts after cleaning and before you apply the maskant. Do not touch parts with bare hands.
Remove grease from parts with SPM TASK 70-11-03-300-503.
Preliminary Requirements
Pre-Conditions
NONESupport Equipment
NONEConsumables, Materials and Expendables
| Name | Manufacturer | Part Number / Identification | Quantity | Remark |
|---|---|---|---|---|
| CoMat 02-388 URETHANE ACRYLIC, UV LIGHT-CURABLE | 46733 | CoMat 02-388 | ||
| CoMat 02-389 MASKANT, AIRFOIL, UV LIGHT-CURABLE | 46733 | CoMat 02-389 | ||
| CoMat 02-406 MASKING RESIN, UV/HEAT CURABLE | 46733 | CoMat 02-406 |
Spares
NONESafety Requirements
WARNING
Procedure
Use a spray, paint brush, or air-assist applicator to apply a thin coat (layer) of UV light-curable maskant at room temperature. Do not brush the same area again and again.
Do a check to make sure the layer of maskant is as equal in thickness as possible over the total masked area.
Apply maskant with a spray, paint brush, or air-assist applicator.
Put the part fully in the UV light-curable maskant, and then remove the part from the maskant.
Do a check to make sure the first coat of maskant is thin and as equal in thickness as possible over the total area of the part.
Dip (Momentarily Put) the part in maskant.
Use an air-powered applicator or applicable device to put UV light-curable maskant into the part.
Do a check to make sure that the internal openings are fully filled with maskant.
Fill the part with maskant.
Use one of the subsequent procedures to apply CoMat 02-388 URETHANE ACRYLIC, UV LIGHT-CURABLE, CoMat 02-389 MASKANT, AIRFOIL, UV LIGHT-CURABLE, or CoMat 02-406 MASKING RESIN, UV/HEAT CURABLE UV light-curable maskant. Refer to Table for a full description of these maskants.
Table 1. Approved UV Light-Curable Maskants To Use Specification
Description
CoMat 02-389 Airfoil Maskant, UV Light-Curable
UV light causes the material of this maskant to cure. This maskant is approved for nickel-base superalloy turbine airfoils only.
CoMat 02-406 UV/Heat Curable Masking Resin
This maskant is approved for masking internal and external features on compressor blades and vanes, and turbine blades and vanes. Do not use this material on titanium alloy or titanium parts.
CoMat 02-388 Urethane Acrylic, UV Light-Curable
UV light causes the material of this maskant to cure. This maskant is approved for nickel-base and cobalt-base superalloys.
UV light-curable maskant that is not fully cured will feel tacky.
If the maskant of the part feels tacky, put the part under UV light again to fully cure the maskant. For parts filled with maskant, it is not necessary for the maskant in the internal openings of the part to be fully cured if the maskant on the external surfaces is satisfactorily cured.
Put the part under UV light to get the optimal (best) cure of the maskant at room temperature.
Do the steps above to apply and cure the UV light-curable maskant again until the part has the number of maskant coats that is necessary to give satisfactory protection.
Examine the cured maskant for pinholes and bare spots.
Examine the part to make sure that there is no maskant on areas that must not have a mask.
Carefully remove unwanted maskant, if necessary.
SUBTASK 70-38-24-380-007 Procedure To Apply (UV) Light-Curable Maskant
NOTE
This maskant procedure is approved to apply a maskant on external surfaces, to seal small holes from the external surface, and to fill the internal openings of turbine airfoils.NOTE
This maskant procedure is not approved for parts made of materials other than nickel-base or cobalt-base superalloys because of the temperatures that are specified in the procedure to remove the maskant.Put the part in an oven at 875 - 1325 °F (468 - 718 °C) for the time necessary to remove the maskant.
Examine the part for the total removal of the maskant.
SUBTASK 70-38-24-380-008 Procedure To Remove Chemical Maskant, Ultraviolet Light (UV) Light-Curable Maskant, or Wax Maskant After Processing