1、._-.-._ . r- MIL-STD-2098 0 I 9999912 OOLS829 i 8- $- y- distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-STD-2038 80 m 37337LL 0015820 8 MIL-STD-ZQ98 AS) DEPARTMENT OF DEFENSE WASHINGTON, DC 20381 Ordnance Preparation
2、 and Application of Intumescent Sheet, Type III. MIL-STD-2098 (As) 1. Agencies of the Department of Defense. This Military Standard is approved for use by all Departments and 2. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this d
3、ocument should be addressed to: neering Specifications and Standards Department (ESSD) Code 93, Lake- hurst, N.J. Improvement Proposal (DD Form 1426) appearing at the end of this docu- ment or by letter. Commanding Officer, Naval Air Engineering Center, Engi- 08733 by using the self-addressed Standa
4、rdization Document ii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-2078 80 99797LL 0035823 T MIL-STD-2098 (AS) FOREWORD 1. to NAVAIR ordnance is the early detonation caused by intense heat from a fuel fire. nance item will extend the firef
5、ighting time thereby providing a better safety factor to both personnel and equipment. One of the most significant problems contributing to safety hazards The application of an intumescent sheet around an ord- iii Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
6、rom IHS-,-,-MIL-STD-2098 80 m 999991I 0035822 I = MIL-STD-2098CAS) CONTFNTS Page 2. REFERENCED DOCUMENTS - - - - - - - - - - 3. DEFINITIONS (Not applicable) - - - - - - 4. GENERAL REQUIREMENTS - - - - - - - - - - 4.2 Quality assurance inspection - - - - - 4.3 General information on application of in
7、tumescent sheet - - - - - - - - - - - 4.1 Application - - - - - - - - - - - - - - 5. 5.1 5.2 5.2.1 5.2.2 5.2.3 5.3 5.3.1 5.3.2 5.3.3 5.3.4 5.3.5 5.4 5.4.1 5.4.2 5.4.3 5.5 5.5.1 5.5.2 5.5.3 5.5.4 5 -6 DETAILED REQUIREMENTS - - - - - - - - - - Ordnance preparation - - - - - - - - - Crdnance informatio
8、n and Materials - - - - - - - - - - - - - - - identification - - - - - - - - - - - - Type of paint - - - - - - - - - - - - Paint stripping - - - - - - - - - - - - Application method - - - - - - - - - - Sprayer - - - - - - - - - - - - - - - Hoses - - - - - - - - - - - - - - - - Spray tests - c - - -
9、- - - - - - - - - Primer application - - - - - - - - - - Cutting of the intumescent sheet - - - Applying adhesive - - - - - - - - - - = Intumescent sheet preparation - - - - - Applying intumescent sheet - - - - - - Applying vacuum to ordnance item - - - Vacuum pressure - - - - - - - - - - - - Trimmi
10、ng intumescent sheet - - - - - - Ordnance identification - - - - - - - - Pre-packaging cure time - - - - - - - - Curing - - - - - - - - - - - - - - - Curing tim - - - - - - - - - - - - - - 1 1 1 1 2 2 2 2 3 Li 2 2 3 3 3 4 4 4 4 4 4 4 5 5 5 5 6 6 6 6 6 6 iV Provided by IHSNot for ResaleNo reproductio
11、n or networking permitted without license from IHS-,-,-MIL-STD-2098 80 W 999991iL 0035823 3 MIL-STD-Z098(AS) CONTENTS - Continued FIGURES Page Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1. SCOPE 1.1 General. This standard provides general instru
12、ction for the preparation and application of an intumescent sheet on ordnance items. 1.2 Classification. The intumescent sheet shall be of the Type III, as described in MIL-C-8 1945(AS). 2. REFERENCED DOCUMENTS 2.1 Issues of documents. The following documents of the issue in effect on date of invita
13、tion for bids or request for proposal, form a part of this standard to the extent specified herein. SPECIFICATION FEDERAL TT-L-50 - TT-R-25 1 - P-W-2891 - PPP-T-680 - MILITARY MIL-PRF-23377 - MIL-C-8 1945(AS) - Lacquer, Nitrocellulose, Acrylic and Acrylic-Butyrate, Aero sol (In Pres suriz ed Dispens
14、ers) Remover; Paint (Organic Solvent Type) Wipe Solvents, Low Vapor Pressure Tape, Pressure-Sensitive Adhesive; Packaging and Packing of Primer Coatings, Epoxy, High-Solids Coating Compounds, Weapon Insulation, Intumescent (Copies of specifications, standards, drawings, and publications required by
15、contractors in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) SUPERSEDES PAGE 1 OF MIL-STD-2098(AS) 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3. DEFINI
16、TIONS (not applicable). 4. GENERAL REQUIREMENTS 4.1 Application. This document is applicable where Type III intumescent coating is applied for added protection of ordnance items in fuel fiie environment. 4.2 Quality assurance inspection. Inspections shall be performed by Quality Assurance Inspectors
17、 to determine that the requirements of this document are met in preparation of the ordnance item and material, conformance of materials, application, and workmanship of the completed item. 4.3 General information on application of intumescent sheet. Close adherence to this standard is vital to assur
18、e proper application and to provide a high quality end product. Satisfactory performance of an epoxy adhesive and intumescent sheet system is dependent upon properly prepared surfaces and the careful application of materials. The accomplishing activity shall insure that: a. Surfaces to be coated sha
19、ll be free of dirt, oil, grease, silicone, salt deposits, moisture, and other surface contaminants. b. The intumescent sheet is applied as soon as practical after cleaning to prevent contamination of the surface. 5. DETAILED REQUIREMENTS 5.1 Materials. The following materials are required to accompl
20、ish this procedure. a. b. C. d. e. Primer, strontium chromate, MIL-PRF-23377, Type I. DeVilbiss Model JGA spray equipment (or equal) or brush, paint, 3“ Flexible epoxy adhesive, 3-M 22 16 Clear Amber or equal. Intumescent sheet material, MIL-C-8 1945(AS), Type III. Putty knife, 3“ blade. SUPERSEDES
21、PAGE 2 OF MIL-STD-2098(AS) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-f. Wet film thickness gage, range 0.002 to 0.003 inch min. g. Dry film thickness gage, range 0.0006 to 0.001 inch min. h. Velostatic bag 10 inch dia. 0.003 to 0.006 inch thi
22、ck material, or equal (anti- static). i. Vacuum pump (capable of obtaining a minimum vacuum of 6- 1 O inches of mercury) and manifold assembly. j. Paint stripper, TT-R-251 Type III Class A. k. Abrasive blasting equipment. 1. Solvent, P-W-2891. m. Tape, adhesive, PPP-T-680, Type III, Class I. n. Pain
23、t, stencil marking, aerosol pack, TT-L-50, flat black. o. Paint, clear lacquer, aerosol pack, TT-L-50. p. Oven, thermostatically controlled (54 +3 degrees Centigrade). 5.2 Ordnance preparation. Remove all items (fuzes, detonation assemblies, armament cable assemblies, etc.) from the ordnance item in
24、 accordance with the applicable documents. Mask all openings that are not to be permanently coated. 5.2.1 Ordnance information and identification. Record all information printed on the ordnance item. This information shall accompany the ordnance item through the process for later copying to the oute
25、r surface of the newly coated item. 5.2.2 Type of paint Determine the type of paint present on the ordnance item and the type of surface preparation required to remove it. 5.2.3 Paint stripping. Strip paint from all surfaces of the ordnance item by using chemical strippers, abrasive blasting or by m
26、echanical scraping. After cleaning, wipe surfaces with solvent conforming to P-W-289 1. SUPERSEDES PAGE 3 OF MIL-STD-2098(AS) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CAUTION: Personnel preparing surfaces shall wear impervious gloves and an ap
27、proved organic vapor respirator. The solvents shall be contained in an approved safety container. 5.3 Application method. Pressurized spray equipment or brush shall be used to apply primer to the ordnance item. The first coat of primer shall be applied to all surfaces within one hour after the final
28、 solvent wipe. 5.3.1 Sprayer. A DeVilbiss Model JGA or equal with air pressure regulator valve attached to the gun shall be used. 5.3.2 Hoses. Air supply hoses shall be clean at the start of primer application. An in-line filter shall be placed on the air supply hose to the pressure pot. 5.3.3 Spray
29、 tests. Test spray equipment assembly by using normal shop procedures. Perform the following tests before starting work on the ordnance. a. Adjust spray pattern to ensure the spray gun is properly atomizing the primer. The spray gun shall be held 18 inches away from a clean sheet of cardboard (12 in
30、ches by 24 inches). A short (one second) application shall be made and the spray obtained shall be observed. b. The equipment shall be adjusted until a uniform pattern with no heavy spots is obtained. Do not use equipment that is not capable of producing a uniform spray pattern. The equipment must b
31、e free from leaks, splatters and other spray defects. 5.3.4 Primer application. Apply primer in accordance with MIL-PRF-23377 to obtain a fiial dry film thickness of 0.0006 to 0.0009 inch. I 5.3.5 Curing. Allow primer to dry approximately 16 to 24 hours at 15 to 27 degrees Centigrade before continui
32、ng coating operations. 5.4 Cutting of the intumescent sheet. Prepare the primed ordnance item for vacum bagging by plugging, if necessary, both ends with wooden or foam type plugs to prevent damage to the vacuum bags and to protect the ends of the sheet material during curing time. Measure the item
33、to be coated and determine the size of sheet required. Cut the SUPERSEDES PAGE 4 OF MIL-STD-2098(AS) 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-2098 80 D 9999911 0015828 2 MIL-STD-2098 (AS) overall length of the sheet longer than the o
34、rdnance item to allow for the adjustment of the gap referenced in paragraph 5.4.3. sheet shorter than required in the circumferential dimension to pro- vide a gap of .O15 +005. perpendicular to coating surface with opposite edge tapered as shown in Figure 1. Cut the One edge of butt joint should be
35、cut ADHESIVE SURFACE1 TEDLAR m SURFACE +o. O00 -0.020 W = circumference of sheet material a = Taper angle to be determined for each component diameter to result in true butt joint on the ordnance item. FIGURE 1. Butt joint. 5.4.1 Applying adhesive. Mix adhesive following the manufacturers directions
36、. Using a putty knife, or suitable tool, apply a uniform layer of adhesive, .O02 inch to .O03 inch thick over the entire outer surface of the ordnance item. .O02 inch to .O03 inch, over entire inner surface of the sheet mater- ial. Apply a uniform layer of adhesive, Measure adhesive thickness using
37、a wet film thickness gage. 5.4.2 Intumescent sheet preparation. Place the cut intumescent sheet (see 5.4) in an oven maintained at 54 23 degrees centigrade to soften sheet and increase its flexibility (approximately 5 to 7 min- utes). 5.4.3 Applying intumescent sheet. Wrap the warm sheet around the
38、ordnance item while the sheet is still flexible enough to conform to the ordnance item surface without cracking. of the longitudinal seam at the top vertical centerline. Slide one mating edge relative to the other so that the maximum gap along the top vertical centerline will be no greater than .O20
39、 inch at any point. Tempororily secure the edges with adhesive tape. Position the mating edges 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-2098 80 W 9999911 0015829 5.5 Applying vacuum to ordnance item. the ordnance item and tightly sea
40、l it to the vacuum manifold base. Tape or clamp the top of the bag to obtain a vacuum tight seal. Place the velostatic bag over 5.5.1 Vacuum pressure. Apply a minimum vacuum of 6 to 10 inches of mercury and maintain this vacuum throughout curing of the adhesive. 5.5.2 Curing time. After 16 to 24 hou
41、rs curing at 15 to 27 degrees centigrade, release the vacuum and remove the ordnance item from the vacuum bag. No voids shall exist along the top vertical centerline. 5.5.3 Trimming intumescent sheet. Trim excess intumescent sheet material from the ends of the ordnance item. 5.5.4 Ordnance identific
42、ation. Transfer the ordnance identification information (see 5.2.1), using TT-L-50 black lacquer to the outer surface of the newly coated item. be applied as shown on applicable engineering drawings. identification information with TT-L-50 clear lacquer. The identification information shall Cover th
43、e 5.6 Pre-packaging cure time. Maintain the coated ordnance item at 15 degrees to 27 degrees centigrade for a minimum of 48 hours prior to packaging or re-assembly. Preparing activity: Navy - AS (Project 8010-N180) 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
