MIL-STD-1622B(SH)
APPENDIX B
instruments shall only be accomplished with procedures approved or accepted by NAVSEA. The performance of HFE-7100 as a field wipe solvent is dependent of the type of soil being removed. HFE-7100 is an excellent wipe solvent for halogenated oils and greases. HFE-7100 is a poor wipe solvent for hydrocarbon oils and greases including silicone.
3/ Ozone depleting halogenated solvent HCFC-141b shall only be used for cleaning critical application gauges and instruments, flushing cryogenic plants, and field wipe of critical applications. HCFC-141b in accordance
with A-A-50425 is restricted to field wipe since it is delivered only as spray can. Be advised that HCFC-141b is reported to have upper and lower explosion limits of 17.7 and 7.6 percent, respectively. When purging or drying
equipment flushed with HCFC-141b, ensure purging is performed with nitrogen and is directed to a well ventilated area free of any ignition sources. Recognize that HCFC-141b at the lower explosion level is toxic representing an immediate hazard to life. HCFC-141b in accordance with A-A-50425 and A-A-
50427 has been satisfactory tested for compatibility with gaseous and liquid oxygen demonstrating no ignition or flash point.
4/ Ozone depleting halogenated solvent HCFC-225 is not authorized for use by any Navy uniformed or civilian personnel. Review of the health and safety aspects of HCFC-225 by the Navy Environmental Health Center concluded that the toxicity testing of the solvent is incomplete; 90-day inhalation and
teratology (fetus development) testing have not been completed. Therefore, no exposure criteria can be recommended at this time. Vendors may use the
solvent at their own risk, however, its use is not authorized on board any NAVSEA vessel or facility. HCFC-225 used for cleaning as specified in this standard shall be in accordance with the following which has passed oxygen liquid and gaseous flammability testing and soil removal performance testing.
Composition (HCFC-225):
3,3-dichloro-1,1,1,2,2-pentafluoropropane (HCFC-225ca)
(CAS No. 422-56-0).......................................45 ± 5%
1,3-dichloro-1,1,2,2,3-pentafluoropropane (HCFC-225cb)
(CAS No. 507-55-1).......................................55 ± 5%
Purity (impurities shall be other halogenated solvents)...99.90% min
Non-volatile residue.......................................5 ppm max
Acid (measured as HCl).....................................1 ppm max
Moisture..................................................20 ppm max
Appearance..............................transparent and no turbidity
5/ For critical applications, a NAVSEA approved halogenated solvent may only be used for field wipe with local engineering approval.
6/ The only non-metallic materials listed are those common to compressed air systems. For other materials, consult the manufacturer, local engineering, or NAVSEA. Where specific information is lacking, perform compatibility testing as specified in A.3.1 of appendix A.
7/ C = Compatible. 12L = Limit exposure to a maximum of 12 hours per cleaning. 1L = Limit exposure to a maximum of 1 hour per cleaning. I = Incompatible. NT = Not tested.
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