PS-00100 Surface Finish Specification

1.0 SCOPE
This specification establishes the priming, painting and topcoat color requirements for components in accordance with the customer contract specifications. This procedure shall be used for aluminum or steel sheet, plate and shapes (tube, rod, channel, etc.)

1.1 Exceptions

1.1.1 Drawings with Undefined Finish Requirements

On engineering drawings for fabricated aluminum or steel parts that have no noted finish requirements, it shall be inferred that the finishing properties listed under Table 1 for appropriate metal substrates will be followed.

2.0 APPLICABLE DOCUMENTS
The following publications shall be applicable to the extent specified herein, or as defined on the contract or purchase order. These publications shall be in effect as of the issues listed. Compliance with any other issues of these publications requires prior written approval from ITW Military GSE. Insofar as any of the publications referred to herein conflict with the requirements of the specification, this specification shall govern.

Military Documents
Available from DODSSP Subscriptions Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, Pennsylvania 19111-5094, U.S.A. or online at http://assist.daps.dla.mil/

  • MIL-DTL-5541, Chemical Conversion Coatings on Aluminum and Aluminum Alloys
  • MIL-PRF-26915, Primer, Steel, Zinc Rich
  • MIL-P-53022B Type II, Primer Coating, Corrosion Inhibiting Epoxy
  • MIL-PRF-85285, Top Paint Coating, High-Solids Polyurethane
  • MIL-PRF-24712, Coatings, Powder
  • MIL-DTL-15090D, Enamel, Equipment, Light Grey (Navy Formula # 111)

Federal Documents
Available from DODSSP Subscriptions Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, Pennsylvania 19111-5094, U.S.A. or online at http://assist.daps.dla.mil/

  • FED-STD-595, Colors used in Government Procurement
  • A-A-59316, Abrasive Materials for Blasting Media
  • A-A-59745, Primer, Steel, Zinc Rich

3.0 GENERAL REQUIREMENTS

3.1 Surface Preparation
All material substrate surfaces shall receive proper pre-treatment to ensure subsequent application of primer/paint to the parent material per the applicable MIL standard or OEM specifications and/or processes. Typical methods of surface preparation for steel and/or aluminum include:

  • Blast Media, see A-A-59316 for abrasive materials
  • Mechanical Preparation such as sanding/grinding
  • Unpainted Aluminum surfaces must be alodined/irridited per MIL-DTL-5541, “yellow” preferred.

NOTE: All hot rolled steel must have “Mill scale” removed per A-A-59316 before primer application. All cold rolled steel shall be sanded or bead blasted to a near white finish.

Parts shall be cured and/or dried prior to additional processing.

3.2 Primer and Paint Application
All primer and paint shall be applied to the parent material per the applicable MIL standard or OEM specifications and/or processes. If a conflict exists between the primer listed and the corresponding primer identified in the Top Coat specification listed in Table 1, the Top Coat specification/requirement takes precedence.

3.3 Paint Process and Part Quality
All material built to this specification shall adhere to the paint process and part quality requirements identified on the purchase order, engineering drawings and supporting documentation. The in process inspection, rejection and rework requirements of the appropriate process specification shall be followed, i.e., MIL-PRF-85285, as identified in Table 1.

3.4 Powder Coating
Powder Coating shall comply with MIL-PRF-24712 (refer to section in parentheses) with tailoring as follows, and only used where directed by purchase order:

  • 3.4.1 Type X, Polyurethane (section 1.2.1)3.4.2 Use acceptable industry practice for resin and curing system (section 3.2)
  • 3.4.3 For aluminum applications use MIL-DTL-5541 (sections identified below) for surface preparation with tailoring as follows:
  • 3.4.3.1 Type II (section 1.2.1)
  • 3.4.3.2 Class 1A (section 1.2.2)
  • 3.4.3.3 Mechanically damaged areas may be touched-up (sections 3.4 and 3.5)
  • 3.4.3.4 No inspection or testing required (section 4.1) unless specified by contract or purchase order.
  • 3.4.4 For steel application:
  • 3.4.4.1 Surface cleaning method shall be selected based on the type and amount of soil and corrosion products on the items (section 1.2.1 and 4.6.2)
  • 3.4.4.2 No inspection or testing (section 4.1) unless specified by contract or purchase order.
  • 3.5 Coating Detail Sheets and Sample Coupons

When requested, vendor shall provide coating detail sheets and sample coupons.

 Table 1: Surface Finish Chart

 Base Material  Primer or Treatment Intermediate Primer  Finish or Topcoat

 Steel

MIL-PRF-26915 MIL-DTL-53022D Type II MIL-PRF-85285
Steel (“Mayport” Only) A-A-59745 MIL-DTL-53022D Type II MIL-PRF-85285
Steel, Powder Coat Cleaned per         A-A-59316

 NONE

MIL-PRF-24712

Aluminum

Chemical Conversion per MIL-DTL-5541 MIL-P-53022B Type II
(if painted)
MIL-PRF-85285   (if painted)

Aluminum
(Powder Coat)

Chemical Conversion per MIL-DTL-5541

 NONE

MIL-PRF-24712

Revisions
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