MIL-HDBK-1025/10
a. Bodily harm can result from contact with asbestos, polychlorinated biphenyls (PCB),
and sulfur hexafluoride (SF6). All are classified as hazardous substances and should be
treated in accordance with Environmental Protection Agency (EPA) regulations.
b. Preservative treatments for wood products also require special handling.
Asbestos. Asbestos is no longer being installed for insulation or fire protection
4.2.4.1
purposes or used as a conduit or piping material. Cutting existing asbestos materials can release
asbestos fibers to the atmosphere. If fibers are suspended in the air in significant quantities,
respiratory harm may be caused by their inhalation.
Note: Employees who are not qualified to work with asbestos are not to handle or remove
materials containing asbestos fibers. Refer to 29 CFR 1015.1001(Asbestos) for worker
qualifications and requirements for handling asbestos containing materials.
Precautionary steps for prevention to asbestos exposures
1.Have unknown material tested for asbestos.
3.Wear proper respiratory protection: either full
face or half face respirators with P-100 Filter if
2.Keep unknown fibers off clothing. Wear
working with fibrous materials.
disposable coveralls.
4. After working with materials, wash hands
prior to eating, drinking or taking a break.
4.2.4.2 Polychlorinated Biphenyls (PCB). Oil-filled equipment such as transformers or
regulators, circuit breakers, and capacitors with PCB insulating fluid should have been removed to
meet NAVFAC directives or at least be identified as PCB-contaminated to meet EPA regulations.
4.2.4.3 Sulfur Hexafluoride (SF6). In its pure state, SF6 is a colorless, odorless,
tasteless, nonflammable, nontoxic, and noncorrosive gas shipped in a liquid form. Since it is five
times heavier than air it can act as an asphyxiant and in a liquid state it can cause tissue freezing
similar to frost bite. Its decomposition products, which can result from electric arcs or faults, are
toxic.
4.2.4.4 Wood Product Preservative Treatments. Creosote and water-borne or oil-
borne preservatives used to treat wood products can only be used by certified pesticide
applicators. Only copper naphthenate preservative treatment does not require certification for its
use.
4.2.5 Explosive or Hazardous Vapors. Battery rooms should be located in a
ventilated corner of the control room because of the potentially explosive hydrogen gas released.
Combustible gases can accumulate in transformer vaults and manholes. A spark or flame, such as
smoking in the vicinity, can ignite these gases. Carbon monoxide may occur from cable faults or
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