MIL-STD-2199A
5.4.2 Specific precautions. The following specific precautions shall be observed:
a. Wear disposable plastic gloves, protective clothing, and goggles. Use barrier cream on exposed skin which may come in contact with resin or hardeners.
b. Wear a dust respirator when handling the thixotropic filler.
c. Avoid contact of resins and associated chemicals with eyes, skin, or clothing. Absorption through the skin may be harmful. In case of contact with the skin, immediately wash with soap and water and flush with plenty of water for at least 15 minutes. If the eyes are involved, immediately flush with water for at least 15 minutes.
Medical attention shall be obtained as soon as possible.
NOTE: Some people may develop an allergic reaction to epoxy resin with extended or frequent skin contact.
d. Avoid prolonged or repeated breathing of vapors. If ventilation is not adequate, wear an organic vapor respirator.
e. If clothes or shoes become contaminated, remove at once and clean thoroughly before reuse. f. Always wash exposed skin areas thoroughly after completing the job.
5.5 Pacility requirements. In general, the shaft covering system is typically applied in two separate facilities.
5.5.1 Shaft preparation, primer application, and elastomeric coating application. The "blast and coat" facility shall provide the equipment to abrasive blast the shaft steel and sleeve to NACE SSPC-SP 5 white metal finish (see
3.1.12). The first layer (primer) and second layer (elastomeric coating) shall be applied in the blast and coat facility.
5.5.1.1 Ventilation. The blast and coat facility shall follow all local ventilation requirements during application of the primer and elastomeric coating.
5.5.1.2 Reaction spray equipment. Plural component reaction spray equipment shall be used for application of the elastomeric coating. Once mixed, the two components of the elastomeric coating start to cure. It is permissible to mix and apply by brush, but in most cases this will require several batches due to the short working life. Thinning the resin with solvent and spraying with conventional equipment is strictly prohibited.
5.5.2 Third and fourth layers - sealing/fairing compound and GRP application. After the elastomeric coating cures, the shaft sections shall be moved to the machine shop. The third layer (sealing/fairing compound) and fourth layer (GRP) shall be applied in the machine shop.
5.5.2.1 Lathe. The machine shop shall have a lathe large enough to accommodate a shaft section.
5.5.2.2 Temperature. During application of the GRP, the ideal temperature of the shaft and the immediate environment should be about 73 °P. Application of the GRP shall not be attempted at temperatures below 60 °P (since both cure of the resin and wet out of the fiberglass will be adversely affected) unless a suitable heat controllable enclosure is used which enables all areas of the shaft to be covered and the covering to be maintained above 60 °P. At higher temperatures (for example, 80 to 90 °P) the gel time (pot life or working life) of the resin will be significantly reduced. Per MIL-R-23461, the resin system may have a gel time of 30 minutes to 2 hours at
73 °P and a minimum of 18 minutes at 90 °P. The manufacturer's instructions shall be consulted for gel time or working life of the specific resin system used. The resin shall not be applied beyond the gel time limits specified by the manufacturer for the resin system used.
5.6 Application instructions. Detailed procedures for applying the four-layer shaft covering system shall be in accordance with Appendix A.
5.7 Inspection and repair. Detailed inspection and repair procedures for the four-layer shaft covering system shall be in accordance with Appendix B.
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