MIL-PRF-49291D
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements for optical fibers shall be as specified herein
and in accordance with the applicable specification sheet. In the event of any conflict between the
requirements of this specification and the specification sheet, the latter shall govern.
3.2 Qualification. Optical fibers furnished under this specification shall be products that are authorized
by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.5
and 6.3).
3.3 Verification requirements. The verification requirements of the optical fibers furnished under this
specification shall be established and maintained in accordance with the procedures and requirements
Materials selected for fiber manufacture shall be of a type and quality to assure compliance with the
requirements of this specification, and shall be physically and chemically compatible for their intended
use throughout the intended lifetime. All materials used shall be nonconductive unless otherwise
specified (see 3.1) and non-nutrient to fungus. Where new and questionable material is being considered
for use, the contractor shall furnish the toxicological data required to evaluate the safety of the material for
the proposed use. Materials used in fiber construction shall not emit toxic or explosive fumes when
exposed to flame, and shall have no adverse effect on the health of personnel when used for their
intended purpose.
3.4.1 Recovered materials. Unless otherwise specified herein, all materials incorporated in the
products covered by this specification shall be new. Products may be fabricated using raw materials
produced from recovered bulk materials to the extent practicable if the intended use of the product is not
jeopardized. The term "recovered material" means materials which have been collected or recovered
from solid waste and reprocessed to become part of a source of raw materials, as opposed to virgin raw
materials. None of the above shall be interpreted to mean that the use of partially processed, assembled,
used or rebuilt products are allowed under this specification.
3.4.2 Materials for space applications. When specified, materials used in space flight applications shall
meet the following additional material requirements.
3.4.2.1 Thermal vacuum outgassing. When specified, and tested in accordance with 4.7.2.5.1, all non-
metallic materials shall not exhibit greater than 1.0 percent total mass loss and shall not produce greater
than 0.1 percent collected volatile condensable materials.
3.4.2.2 Odor. When specified, and tested in accordance with 4.7.2.5.2, non-metallic materials shall
rate not greater than 2.5.
3.4.2.3 Toxicity. When specified, and tested in accordance with 4.7.2.5.3, all non-metallic materials
shall not exceed a total hazard index of 0.5.
3.5 Design and construction (see 4.7.2). The design, construction, and physical dimensions of the
complete fiber shall be as specified herein and in the specification sheet (see 3.1).
3.5.1 Optical fiber. Optical fibers shall be sufficiently free of imperfections, inclusions, and impurities
other than dopants, to conform to the specified strength and optical transmission requirements. The
optical fiber shall be coated with a suitable material to preserve the high pristine tensile strength of the
fiber.
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