MIL-PRF-3420H
TABLE I. Performance requirements.
Characteristics
Requirements
Test
Paragraph
Reference
Vapor inhibitor ability
No more than a total of 3 corrosion spots on
4.5.1
(VIA)
3 plugs. No corrosion spot greater than 300
microns in diameter.
4.5.1
No more than a total of 3 corrosion spots on
Vapor inhibitor ability
3 plugs. No corrosion spot greater than 300
after
exhaustion
microns in diameter.
Contact corrosivity
No corrosion, etching or pitting of contact
4.5.1
area of panel.
Blocking resistance
No blocking, delamination, tearing or
4.5.1
flaking when the sheets are separated.
Water resistance of
Markings shall be clear and legible.
4.5.1
markings
Strength:
Class 1
Class 2
Class 3
Bursting (psi min) 1/
60
40
20
4.5.1
Tearing, machine and
110
40
12
4.5.1
cross directions (gms min)
Long term protection
No corrosion of steel panels.
4.5.2
No pitting, etching, dark tarnish
Compatibility with copper
4.5.3
(classification 3), or corrosion
(classification 4) of the vapor exposed
surface. Discount attacks within 1/16 inch
of specimen.
4.5.4
Compatibility with
No delamination, swelling, embrittlement,
MIL-PRF-131 barrier
dissolution, effect on the sealability or
material
deterioration of barrier material.
1/
On crepe material, bursting strength value shall be obtained with specimen stretched. Crepe
requirement shall be 50 percent of flat.
3.7 Workmanship. The appearance of finished wrapping materials that are coated or
impregnated shall not contain any voids in the coating or substrates (see 4.3.2.2). The material
shall be clean and free from holes, tears, cuts, sharp creases, wrinkles, or other imperfections.
The treated carrier shall be cut and trimmed of any selvage (see 4.3.2.1).
5
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