MIL-DTL-11891G(AT)
element of his inspection system, rejected inspection lots may be resubmitted for acceptance if the
contractor performs 100 percent inspection on the lot for those characteristics which were
defective and resulted in rejection of the lot and removes all defective units or obtains procuring
activity approval to resample the lot due to the insignificance of the defects. Resubmitted lots
shall be kept separate from new lots and shall be clearly identified as resubmitted lots. Blemishes
on rubber components which have not been listed in table VI and are primarily appearance or
cosmetic conditions (poor markings, pitting of molds, minor surface contamination) should be
resolved by manufacturers as these conditions arise.
TABLE VI. Classification of defects.
Method of
Classification
Defect
inspection
SIE 1/
Blisters
A void or hole in article which causes protrusion on
surface when hot, may not show on surface when cold
- unacceptable in bushings. Allowable tolerance 1/16
inch max length/depth on pads and wheel-side rubber.
Same as backflow or back-flash. Distortion at the
mold line in the form of wrinkles, folds, tears.
Back-rinding
Unacceptable on bushings. Allowable tolerance 1/16
SIE
inch deep, 1/16 inch wide, 1/2 inch length along the
mold line.
Cracks
Failure of rubber stock to knit together properly. It
Visual
may be found in any part of the rubber surface and also
at the rubber base next to the metal.
SIE
Rubber missing due to chipping, usually during
Chipped
removal from mold or during trimming. Unacceptable
on bushings. Allowable tolerance 1/8 inch max in
depth/ length, provided there is no cutting beyond this
dimension.
Visual
A slit, nick, or gash caused primarily by trimming
Cuts/Tears
of vulcanized components. Tear may be caused during
removal of items from molds.
Visual
A crease or pleat, usually appears as overlap of rubber
Folds
on itself with a relatively weak cohesion.
Visual
Any extraneous matter such as wood, paper, metal,
Foreign
dirt, etc. penetrating past the rubber surface.
materials
SIE
Thick spew-out rubber during moldings that results
Wide flash
in dimensional noncompliance of the vulcanized
component.
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