L-T-80C
4.5.5 Adhesion and adhesive transfer. The adhesion and adhesive transfer of the tape, both as received and
after the rolls have been subjected to accelerated aging in accordance with 4.5.2, shall be determined in
accordance with ASTM D3330/D3330M with the following exceptions and additions:
a) The rubber covered roller shall be 1.875 inches ± 0.1 inches in width by 5.0 inches ± 0.0312
inches in diameter and shall weigh 10.0 pounds ± 0.1 pounds. It shall be either mechanically
or manually operated at a rate of 12 inches per minute. However, when manually operated,
care shall be taken that the operator exerts no vertical force which might change the effective
weight of the roller.
b) The roller shall be passed over the specimen five times in each lengthwise direction.
c) After removal of the tape from the panel, the panel shall be visually examined for percent of
adhesive transfer.
4.5.6 Unwind.
4.5.6.1 Type I. Rolls of tape, both as received and after accelerated aging in accordance with 4.5.2 shall be
tested for resistance to unwinding in accordance with ASTM D3811/D3811M. During this test, the tape
shall be examined for stringiness of adhesive.
4.5.6.2 Type II. Tape with release liner will not be tested for unwind.
4.5.7 Water vapor transmission rate. The water vapor transmission rate of the tape shall be determined in
accordance with ASTM D3833/D3833M with the following exceptions:
a) The cup shall be filled with desiccant to within ¼ inch of the top.
b) If finger pressure alone is found to be inadequate, a suitable applicator shall be used to insure a
smooth, uniform, and wrinkle-free lay down of the tape.
4.5.8 Corrosivity and resistance to weathering. The resistance of the tape to weatherometer aging shall be
determined in accordance with ASTM D6551D6551M with the following exceptions and additions:
a) The specimen width shall be 1 inch ± 1/32 inch.
b) The panels shall be of aluminum alloy Alclad 2024 conforming to ASTM B209.
c) The roller and its method of application shall be as specified in 4.5.5.
d) The exposure period shall be 12 days (288 hours).
e) Immediately before removal, the tape shall be examined for conformance to 3.2.1.
f) After removal of the tape, the panels shall be examined for conformance to 3.2.2.
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