L-T-80C
2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict
between the text of this document and the references cited herein, the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a
specific exemption has been obtained.
3. REQUIREMENTS
3.1 Material. All material used shall be as specified herein, on the drawings, or in the contract or
purchase order (see 6.2). Materials not specified shall be selected by the contractor and shall be subject
to all provisions of this specification.
3.1.1 Backing. The tape's backing shall be a smooth, scratch-free aluminum foil.
3.1.2 Adhesive. The adhesive shall be pressure-sensitive and require no solvent, heat, or other
preparation prior to or after application to clean, dry surfaces. The adhesive shall be homogeneous,
water resistant, and applied in a smooth uniform layer to one side of the backing throughout the length
of the tape.
3.1.2.1 Type I. There shall be no release liner covering the adhesive.
3.1.2.2 Type II. The adhesive shall be covered by a release liner.
3.2 Physical Properties. The tape shall comply with the requirements of Table I when tested as specified
in 4.4.
TABLE I. Physical Properties.
REQUIREMENT
TEST METHOD
PROPERTY
PARAGRAPH
MINIMUM
MAXIMUM
Thickness, inches (backing only)
0.0025
0.0035
4.5.3
Tensile strength (lbs/inch width)
26
---------
4.5.4
Adhesion, oz/inch
Initial
40
---------
4.5.5
After accelerated aging
35
---------
4.5.5
Adhesive transfer, per cent
Initial
---------
5
4.5.5
After accelerated aging
---------
10
4.5.5
Unwind, lbs/inch width
3 1/
Initial
---------
4.5.6
After accelerated aging
---------
4
4.5.6
Water vapor transmission rate,
---------
0.07
4.5.7
grams/100 sq inches/24 hrs
Resistance to weathering
(see 3.2.1)
---------
4.5.8
Corrosivity
---------
(see 3.2.2)
4.5.8
1/
There shall be no visual evidence of stringiness of the adhesive on separation from the roll, either before or after
accelerated aging.
3
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