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NAVISTAR - MPAPS G-9009

Painting, Parts

active, Most Current
Organization: NAVISTAR
Publication Date: 1 May 2022
Status: active
Page Count: 19
scope:

This specification covers the general requirements, specific properties, and performance requirements of painted metal parts, and is divided into multiple classes.

Restricted Chemical Substances

All product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification.

Finish Classification

Class of finish of painted parts shall be specified on the engineering drawing. Painted parts shall meet all requirements for the specified class as described herein. Paint covered by this specification should not be exposed to continuous service temperatures above 150°C (see MPAPS G-9015 for parts requiring high temperature paint, such as exhaust components).

Class I

For decorative exterior parts which require excellent corrosion resistance and appearance performance requirements such as exterior portions of the cab and parts which mount to the cab. Class I parts are assumed to meet the Suffix A level requirements unless otherwise indicated.

Class II

For decorative and non-decorative exterior chassis/frame or powertrain parts that require good corrosion resistance. Decorative parts would be specified as Class IIA. Non-decorative parts would be specified as Class IIB, IIE or IIP. Class IIE and IIP are functionally interchangeable in many cases. Class IIB has minimal UV protection where Class IIE and Class IIP UV protection is not required. Class IIP parts require topcoating in a Navistar facility. Class IIE parts do not. Examples of non-decorative Class IIP parts include frame rails and cross members, fabricated brackets, clips, steering arms, pitman arms, torque rods, U-bolts, disc wheels, rims, rings, spacer bars, drag links, etc.

Class III

For decorative and non-decorative interior cab parts that require minimal corrosion resistance. Decorative interior cab parts are specified by adding the suffix A, which means part finish must meet corrosion resistance, as well as appearance performance requirements that include color match, gloss, and weathering/ultraviolet exposure. Decorative examples include visible parts. Non-decorative includes parts such as brake and clutch lever arms and mounting brackets.

Class IV

For parts that are not cosmetically important such as castings, engines, and engine attachments. Class IV replaces TMS-9009 Class V, and TMS-9009 Class VI (casting sealer such as old CEMS G-5 Casting Sealer Grades -41, -43, and -43W, as examples) and CEMS G-5 Classes F and G. It may also be used in lieu of EMS G5-0001. Class IVC replaces MPAPS G-9009 Class IIC for engine, interior under hood parts, and casting sealers.

Suffix Requirements

Suffix P

This suffix may be applied to a paint Class specification (Example: Class IP or IIP) if it is established that the subject part will always be top coated after assembly. Primers are subject to the part performance requirements listed in Table 1A (primer only) but do not have to meet the performance requirements listed in Table 1B. Note: Primed parts are generally not resistant to UV, so they shall not be stored outdoors or in sunlight prior to topcoat

Electrocoat or E-coat is often used as a primer. Where it may be used as such, but it is not required, the P suffix is sufficient. In those cases where E-coat is desired to be specified as either the primer or as a finish coat, see section 2.3.5.

Suffix A

This suffix indicates final part finish must meet corrosion resistance, as well as appearance performance requirements that include color match, gloss, and weathering/ultraviolet exposure.

Class IA finish should be specified for parts that would be part of, or attached to, highly visible areas of the cab or body. Examples would be the cab-in-white, a body-colored skirt or a below-the-door modesty panel.

Class IIA finish may be applied to highly visible, decorative parts attached to the chassis below or behind the cab or body. Examples would be steps, exhaust stack supports, fuel tanks and straps.

Suffix B

Class IB is for highly exposed and semi exposed parts which are harshly subjected in service to road dirt, de-icing chemicals and debris. Painted bumper finishes should be specified as class IB1 .

Class IIB replaces TMS-9009 Class IV. It is intended for exposed and semi-exposed non-decorative parts mounted to the frame or chassis that thus require some resistance to UV exposure. Class IIB parts could be recoated in chassis paint and as such are subject to compatibility requirements.

Suffix C

Suffix C represents a performance reduction for parts that are not cosmetically important, not directly exposed to road dirt and de-icing chemicals and not exposed to UV radiation (under hood, between and above the frame). This suffix should only apply to Class IV parts.

Class IIC and IIIC are not recommended for use and require Validation Director approval for use.

Class IC is specified if the application appropriately requires thermosetting acrylic paints (TSA) which have minimal exterior weathering but good corrosion performance. Typical applications include mounting brackets for exterior component mounting that does not get significant direct light exposure. Some glamour surfaces may be specified this way for specific components requiring a TSA paint.

Suffix E

This suffix is used for primer systems that are applied using an approved chemical pretreatment followed either by electrodeposition (E-coat) or auto deposition. See MPAPS G-5 Primer Grade -56 as an example. In general, these systems can be used interchangeably, provided the other requirements can be met- such as surface finish (if required). In the rare instance that one or the other is required, then it shall be so noted on the print as E1 for electrodeposition and E2 for auto deposition.

Example Drawing Designation:

Prime per MPAPS G-9009 CLASS IIE1 (part that requires E-coat as the primer)

In some cases, electrodeposition or autodeposition parts may be used in applications that will not be further painted. In these cases, paint compatibility and associated testing may be waived When this suffix is specified as a finish, it must meet primer performance requirements listed in Table 1A, and the topcoat performance requirements listed in Table 1B. Please contact Materials Engineering for further guidance.

Example Drawing Designation:

Finish per MPAPS G-9009 CLASS IIE1 (part that requires E-coat as the topcoat - no further painting)

The E suffix may also be used for any other paint or powdercoat type finish that serves as the final finish (topcoat) but which does not need any UV protection. Finishes must meet primer performance requirements of Table 1A and the requirements of Table 1B

Example Drawing Designation:

Finish per MPAPS G-9009 CLASS IIE (part with a single topcoat, applied by any method, that does not require UV resistance)

Note: Primed or finished Class P or Class E parts, because they lack UV resistance requirements shall not be stored outdoors or in sunlight prior to topcoat/assembly.

Suffix K

This requires a powder coat type paint system (rather than a liquid system). Powder and liquid paint systems can both meet this specification and usual requirements do not discriminate or require one or the other. In some cases, a powder system may be required and so designated by this suffix. All other specification requirements still apply.

If a specific polymer type of powder coating is required, it shall be so designated on the engineering print.

Suffix S

This suffix indicates a critical structural joint and areas on the part will be designated for special paint film thickness control and requirements, as excessive paint can degrade such joints.

In some cases, paint may need to be completely removed or masked from specific areas. This should be so designated on the controlling engineering print.

APPLICATION

This specification outlines the requirements for primed and/or painted metal parts used in NAVISTAR trucks, parts, and components. For painting of thermoplastic parts, see MPAPS G-9008. For painting of Fiberglass Reinforced Polymer parts, see MPAPS G-9005. High temperature paints for exhaust components are covered by MPAPS G-9015.

1 Where TMS-9016 (Painting, Bumpers) is indicated Class IIA requirements should be expected.

Document History

MPAPS G-9009
May 1, 2022
Painting, Parts
This specification covers the general requirements, specific properties, and performance requirements of painted metal parts, and is divided into multiple classes. Restricted Chemical Substances...
October 1, 2021
Painting, Parts
This specification covers the general requirements, specific properties, and performance requirements of painted metal parts, and is divided into multiple classes.
October 1, 2020
Painting, Parts
A description is not available for this item.
November 1, 2019
Painting, Parts
A description is not available for this item.
June 1, 2017
Painting, Parts
A description is not available for this item.
February 1, 2017
Painting, Parts
A description is not available for this item.
August 1, 2016
Painting, Parts
A description is not available for this item.
December 1, 2015
Painting, Parts
A description is not available for this item.
October 1, 2015
Painting, Parts
A description is not available for this item.
August 1, 2015
Painting, Parts
A description is not available for this item.
April 1, 2015
Painting, Metal Parts
A description is not available for this item.
December 1, 2014
Painting, Metal Parts
A description is not available for this item.
October 1, 2014
Painting, Metal Parts
A description is not available for this item.
August 1, 2014
Painting, Metal Parts
A description is not available for this item.

References

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