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|  4.5
Methods of inspection.
4.5.1 Dimensional control of molded or plastic parts. In
place of normal sampling and inspections associated with the
Classification of Defects, and after a curing time for the parts has
been approved (See Note 1), a sample if three(3) parts (as molded)
from each cavity shall be fully inspected dimensionally to qualify a
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new or reworked cavity for use in production. Each molded part
shall carry the individual cavity identification. As a control of
each cavity during production, the above quantity of parts from each
cavity shall be inspected for at least the defects listed in
paragraphs 4.4.2.1, 4.4.2.2, 4.4.2.6, 4.4.2.8, 4.4.2.12 and 4.4.2.14
after continuous production of each 5,000 parts or at the end of
each week, whichever occurs first. Of the three (3) samples, one
(1) sample shall be the last part produced. If any defective
part(s) are found during qualification of the cavity; the cavity
producing the defective part(s) will not be used in production. If
any defective part(s) are found when inspection is performed for the
control of the cavity, the cavity producing the defective part(s)
shall be removed from production. Further, that portion of
production since the last control check shall be returned to the
contractor for inspection for each separate type of defect according
to MIL-STD-105, using an AQL of 0.40 percent for each major defect
and AQL of 0.65 percent for each minor defect. All cavities removed
from production because of some fault, may, after reworking, be
returned to production providing they pass the qualification test
above. The contractor may request a change of inspection frequency
providing he presents objective evidence to the Contracting officer
to substantiate the request. Contractor design of gages and test
equipment required to perform the inspections listed herein shall be
submitted per 6.3 for approval prior to manufacture of equipment.
The noted subparagraphs identify those items and minimum inspections
subject to the requirements of this paragraph.
NOTE 1: In establishing a curing time dimensionally check
ten(10) parts from each cavity at periodic intervals (e.g. every
30, 60, etc. mins.) until dimensional stability is attained.
The curing time will be from the time the part comes out of the
mold unitl dimensional stability is attained. The inspection
data used in determining the curing time shall be sent to the
procuring activity (reference 6.5). If there is a change in
material, or in the cycle time, or if a cavity is reworked, or a
new cavity is used, a new curing time shall be established and
approved.
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