TO 1-1-700 - Robins Air Force Base

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TO 1-1-700 Figure 12-6. Sealant Injection Guns Before using sealant materials, refer to the sealant Material Safety Data Sheet (MSDS) for information on handling precautions. SAE AMS-S-8802, SEALING COMPOUND (POLYSULFIDE) 62 MIL-PRF-81733, SEALING AND COATING COMPOUND, CORROSION INHIBITIVE 48 12.4.4 Sealant Kits (Semkits®). Certain types of sealants, such as SAE AMS-S-8802 (MIL-S-8802) and MIL-PRF- 81733, are available as ready to use kits (Semkits®). These kits are compact, two-part mixing application units designed for convenient storage, easy mixing, and proper application of the sealant in small quantities. The base component of the sealant is packed in standard 2-1/2 ounce and 6 ounce cartridges which are placed in a filleting gun or injection gun for application after mixing with the accelerator/catalyst. There are two styles: the Barrier Style which holds proportioned amounts of the two components separated by an aluminum barrier disc; and the Injection Style, which stores the accelerator/catalyst material within the injection rod to separate it from the base compound prior to use (Figure 12-7). When using Semkits®, note that the handle or the injection/dasher rod contains a pre-measured amount of accelerator/catalyst and should be retained until the ramrod has been operated to break the seal at the bottom of the injection/dasher rod releasing the accelerator/catalyst into the base component and mixing is completed. All of the materials contained inside these two- 12-18
TO 1-1-700 component Semkit® packages are mixed within the cartridges. Follow the manufacturer's recommended storage instructions for these Semkits®. 12.4.5 Sealant Removal and Application Tools. The most commonly used tools for removing or fairing out sealants are shown in Figure 12-5. Other tools may be manufactured as needed to fit a specific situation. Only plastic shall be used to manufacture these sealant removal and application tools. 12.5 SEALANT MIXING. The proper weighing and mixing of components is essential to assure proper curing and adhesion of sealants. Use an appropriate weight scale (see TO 1-1-691 Appendix B) to accurately measure the materials before blending. Accomplish all mixing in one designated central area in each organization. Polysulfide and polythioether sealants consist of two separately packaged components, a base compound (usually part B) and an accelerator/catalyst (usually part A) in 1/2 pint (6 oz.), pint (12 oz.), and quart (24 oz.) kits. The base-to-accelerator/catalyst ratio varies with different manufacturers of the same type of sealant. It is important, therefore, to mix the material according to the manufacturer's instructions/recommendations. Add accelerator/catalyst into the base in the correct ratio and mix until a uniform color is obtained. Difficulties with curing and/ or adhesion of polysulfide and polythioether sealants are frequently caused by incomplete mixing. Two component sealants are chemically cured and do not depend on solvent evaporation for curing. Slow hand mixing is recommended for two - component can type kits. A high speed mechanical mixer should not be used as internal heat will be generated thus reducing application life and introducing air into the mixture. Refer to Figure 12-7 for injection style Semkit® mixing instructions. the application, tack-free, and cure times are lengthened by approximately one-half. For each 15% increase in RH above 50%, the application, tack-free, and cure times are shortened by approximately one-half; while for each 15% decrease in RH below 50%, the application, tack-free, and cure times are lengthened by approximately one-half. Maintenance personnel should be aware of the effects of temperature and humidity on the application life of a sealant. Mix only the amount of material that can be applied during the rated work life of the sealant. There are several corrective measures that can be used to prevent and/or lessen sealant curing problems caused by various environmental conditions. 12.5.1.1 At a relative humidity of 30% RH or lower (sometimes even 40% RH causes a problem), it is very difficult to properly cure sealants. When these conditions are experienced, adding water vapor to the air to increase the humidity by either wetting down the floor of the facility, covering the area being sealed with a wet cloth without it touching the sealant surface and keeping the cloth wet during the cure cycle, or some other convenient method will eliminate the problem. Do apply heat sealants until 30 minutes minimum have elapsed at ambient temperature after application to allow the contained solvents to flash off. Most solvents are flammable and could catch fire if sealants are exposed to higher temperatures before the solvents flash off. NOTE If sealants are heated to a temperature of 110 ºF (43 ºC) or greater as noted in paragraph 12.5.1.2 below, no adjustment to the humidity is required. MIL-PRF-81733, SEALING AND COATING COMPOUND, CORROSION INHIBITIVE 48 12.5.1 Application Life. Application life and cure times are dependant on environmental considerations. The application life of a sealant is the length of time that a mixed scaling compound remains usable at 77 ºF (25 ºC) and 50% Relative Humidity (RH). This time (in hours), known as a dash number, is denoted as the last number in a sealant designation (e.g., MIL-PRF-81733, Type II-2 has an application life of 2 hours). Table 12-2 indicates application times, tack-free times, and full cure times for each sealant type and dash number at 75 ºF and 50% RH. For each 18 ºF (10 ºC) increase in the temperature above 77 ºF (25 ºC), the application, tack-free, and cure times are shortened by approximately one-half; while for each 18 ºF (10 ºC) decrease in the temperature below 77 ºF (25 ºC), MIL-S-85420, SEALING COMPOUND, QUICK REPAIR, LOW TEMPERATURE CURING 53 SAE AMS-3277 (MIL-S-29574), SEALING COMPOUND, LOW TEMPERATURE CURING 61 12.5.1.2 Except for MIL-S-85420 and SAE AMS-3277 sealants that are designed to cure properly with good adhesion at low temperatures, sealant curing is extremely slow when applied at ambient air temperatures of 500 ºF (100 ºC) and Change 1 12-19
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TO 1-1-700 TECHNICAL MANUAL CORROSI
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TO 1-1-700 TABLE OF CONTENTS Chapte
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TO 1-1-700 TABLE OF CONTENTS - CONT
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Page 13 and 14:
TO 1-1-700 LIST OF ILLUSTRATIONS -
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TO 1-1-700 FOREWORD 1. PURPOSE. The
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TO 1-1-700 List of Related Publicat
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TO 1-1-700 SAFETY SUMMARY 1. GENERA
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TO 1-1-700 AMS-G-6032, GREASE, PLUG
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TO 1-1-700 MIL-DTL-64159, COATING,
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TO 1-1-700 MIL-PRF-27617, GREASE, A
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TO 1-1-700 O-L-164, DRESSING, LEATH
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TO 1-1-700 MIL-T-81772, THINNER, PO
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TO 1-1-700 tronics equipment and th
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TO 1-1-700 cleaning situation, syst
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TO 1-1-700 c. Riveted joints shall
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TO 1-1-700 c. Remove and replace an
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TO 1-1-700 MIL-L-87177, LUBRICANT,
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TO 1-1-700 Figure 3-1. Simplified C
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TO 1-1-700 resistant, and also at t
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TO 1-1-700 is first noticeable as a
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TO 1-1-700 3.7.8 Oxygen Concentrati
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TO 1-1-700 Figure 3-14. Concentrati
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TO 1-1-700 Figure 3-17. Galvanic Se
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TO 1-1-700 Figure 3-20. Aluminum Su
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TO 1-1-700 3.8.7 CRES/Stainless Ste
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TO 1-1-700 3.9.10 Climate. Warm, mo
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TO 1-1-700 3.11 PREVENTATIVE MAINTE
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TO 1-1-700 CHAPTER 4 COMPOSITE AND
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TO 1-1-700 4.4.4.4 Glass parts shal
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TO 1-1-700 CHAPTER 5 PACKAGING (STO
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TO 1-1-700 extent of damage dependi
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TO 1-1-700 5.15 PRECAUTIONS FOR VCI
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TO 1-1-700 c. Secure the desiccant
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TO 1-1-700 Figure 5-8. Shock Isolat
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TO 1-1-700 Figure 5-9. Examples of
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TO 1-1-700 5.24.10 Rigid or Flexibl
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TO 1-1-700 CHAPTER 6 MOISTURE AND F
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TO 1-1-700 c. 6.2.6 Felt. Examine f
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TO 1-1-700 a. After first directing
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TO 1-1-700 6.4.5.14 Terminals, scre
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TO 1-1-700 NOTE • Authorized clea
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TO 1-1-700 Table 7-1. Cleaning of S
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TO 1-1-700 7.3.1.2.3 Portable, 45 g
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TO 1-1-700 Table 7-2. Common Milita
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TO 1-1-700 inactivity, storage, or
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TO 1-1-700 7.5.6.5.1 Grade 1 - A th
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TO 1-1-700 Table 7-4. Corrosion Pre
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TO 1-1-700 Table 7-5. Preservation
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TO 1-1-700 either case, MIL-PRF-269
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TO 1-1-700 MIL-PRF-85285, COATING,
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TO 1-1-700 c. Cadmium plated surfac
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TO 1-1-700 a. Scuff sand and feathe
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TO 1-1-700 7.7.7.2 If surface is no
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TO 1-1-700 7.7.9.2 Where only parti
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TO 1-1-700 7.8.1 Type I Application
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TO 1-1-700 Extend (Loctite) 32150 J
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TO 1-1-700 There are three ways to
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TO 1-1-700 vulnerable surfaces clea
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TO 1-1-700 Table 8-2. Materials, Th
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TO 1-1-700 Table 8-4. Electronic Cl
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TO 1-1-700 Table 8-5. Accessories o
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TO 1-1-700 Table 8-5. Accessories o
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TO 1-1-700 f. Devices with permanen
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TO 1-1-700 Table 8-7. Cleaning and
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TO 1-1-700 MIL-PRF-87937, CLEANING
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TO 1-1-700 of contamination). Maint
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TO 1-1-700 8.8.2 Protective Coating
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TO 1-1-700 • Tube clamps. • Min
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TO 1-1-700 a. For bonding/grounding
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TO 1-1-700 vertently destroy the mo
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TO 1-1-700 doors, and other corrosi
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TO 1-1-700 CHAPTER 10 CORROSION PRO
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TO 1-1-700 MIL-PRF-81733, SEALING A
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TO 1-1-700 d. After corrosion is re
Page 179 and 180: TO 1-1-700 (3) Stainless/CRES steel
Page 181 and 182: TO 1-1-700 10.9 WATER ENTRAPMENT AR
Page 183 and 184: TO 1-1-700 f. Shield equipment from
Page 185 and 186: TO 1-1-700 b. Use e-inch rivnuts of
Page 187 and 188: TO 1-1-700 10.17.3 If the plating s
Page 189: TO 1-1-700 Figure 10-16. Dissipatio
Page 192 and 193: TO 1-1-700 (2) If allowable damage
Page 194 and 195: TO 1-1-700 Table 11-1. Recommended
Page 196 and 197: TO 1-1-700 11.6 3M CO. SCOTCH-BRITE
Page 198 and 199: TO 1-1-700 11.11.2 Control of Mecha
Page 200 and 201: TO 1-1-700 11.12.2 Mechanical Damag
Page 202 and 203: TO 1-1-700 MIL-DTL-81706 (ALODINE),
Page 204 and 205: TO 1-1-700 11.13.2.3 Application of
Page 206 and 207: TO 1-1-700 only when there is no da
Page 208 and 209: TO 1-1-700 NOTE SEMCO PASA-JELL 101
Page 210 and 211: TO 1-1-700 (CRES), lead, ceramic, g
Page 212 and 213: TO 1-1-700 11.13.7.2 Treatment of C
Page 214 and 215: TO 1-1-700 MIL-A-46106, ADHESIVE/SE
Page 216 and 217: TO 1-1-700 Table 12-1. Sealing Comp
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Page 226 and 227: TO 1-1-700 Figure 12-2. Sealant App
Page 228 and 229: TO 1-1-700 Figure 12-4. Rivet Appli
Page 232 and 233: TO 1-1-700 below and adhere very po
Page 234 and 235: TO 1-1-700 Table 12-2. Time Require
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Page 238 and 239: TO 1-1-700 of 20 to 25 seconds in a
Page 240 and 241: TO 1-1-700 d. Remove all uncured se
Page 242 and 243: TO 1-1-700 MIL-PRF-81733, SEALING A
Page 244 and 245: TO 1-1-700 MIL-PRF-81733, SEALING A
Page 246 and 247: TO 1-1-700 Figure 12-12. Typical Me
Page 248 and 249: TO 1-1-700 may be used for low temp
Page 250 and 251: TO 1-1-700 Figure 12-14. Sealing Pr
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TO 1-1-700 - Robins Air Force Base

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