99 Series Defthane APC/ELT® Polyurethane MilitaryTopcoat

Product description

99 Series Defthane Advanced Performance Coatings are chemically cured,

polyurethane topcoats intended for exterior application on aircraft and aerospace

equipment. When used over properly applied commercial or military primers, 99

Series coatings provide excellent protection against weathering, humidity and salt

spray.

 Excellent gloss level and color retention

 Resistant to hydraulic fluids, lubricating oils, JP-5 fuel and water

 Compatible with many types of spray equipment

 Service temperature -54°C to 177°C (-65°F to 350°F)

Components

Mix ratio (by volume):

 99 Series (base component)

 99CAT (activator component)

3 parts

1 part

Specifications

99 Series polyurethane military topcoats are qualified to:

 DMS 2115*

 MIL-PRF-32239*

 MIL-PRF-85285 Type IV Class H

*Available in limited colors

Note: PPG Aerospace recommends you check the most recent specification QPLs for

updated information.

Product compatibility:

99 Series polyurethane military topcoats are compatible with the following primers:

 DMS 1786

 MIL-PRF-85582

 MIL-DTL-53022

 MMS-423

 MIL-PRF-23377

 TT-P-2760

 MIL-PRF-32239

99 Series Defthane APC/ELT® Polyurethane Military Topcoat

Page 2

99 Series Defthane

Surface preparation and pretreatments

99 Series polyurethane military topcoats can be applied over clean, dry, and intact

Desoprime™ epoxy and Koroflex

primers. 99 Series polyurethane military topcoats

may be applied over the primer with no abrasion if the primer was applied between 4

and 48 hours before top coating. After 48 hours of primer dry time, then abrade the

primer surface and clean the surface with Desoclean™ 110 mild solvent cleaner. For

further information, refer to the technical data sheet for the above mentioned primers.

Instructions for use

Mixing instructions:

Thoroughly stir or mechanically shake the base component (Part A) for at least 10

minutes before combining to ensure all solids are completely dispersed. Add one

volume of catalyst component (Part B) to three volumes of base component (Part A).

Do not use the catalyst component (Part B) from another color. Mix by hand stirring,

paint shaker or mechanical mixing to ensure the base/catalyst mixture is

homogeneous. Do not shake or mechanically mix the admixed material for longer than

10 minutes.

Thinners are not required for the mixed material. Available thinners for polyurethanes

are MIL-T-81772B Type I* (IS-213), VOC Exempt Reducer (IS-256) and Low HAPS

thinner (IS-260). Do not add thinners to attempt to compensate for coatings beyond its

useful pot life

Note: It is important to condition the paint for 24 hours prior to mixing by placing all

materials in the shop or hangar, with ambient temperatures between 13° and 35°C

(55° to 95°F). The minimum temperature of the paint components should be 13°C

(55°F) prior to mixing.

Induction time:

Not required

Viscosity: (23°C/73°F)

 #2 Zahn cup

41 seconds maximum

 #4 Ford cup

30 seconds maximum

 ISO 4 cup

68 seconds maximum

 BSB3 cup

66 seconds maximum

 BSB4 cup

36 seconds maximum

 AFNOR #4 cup

34 seconds maximum

Note: Viscosities quoted are typical values obtained when using specified mix ratio.