Purpose: To determine the
corrosivity of the atmosphere in and contact with the inner surfaces
of 3 - dimensional packages such as thermoformed,corrugated,injection
molded and paperboard,etc.. This test method is designed to be
application specific for the actual packages to be used. It is
intended to be used in conjunction with but not replace the Contact
Corrosivity Test Method 3005 of Federal Test Standard 101C and
Corrosion: Deterioration of a material by chemical action,
usually as a result of oxidation, galvanic, acid, or alkali action.
In this test method a visible change in the surface finish such
as pitting or etching or the formation of loose or granular particles
shall constitute corrosion.
Stain:Color changes formed only on the surface without
any evidence of rust, pitting, etching, or deterioration of the
surface. In this test stain shall be graded on a scale from 0
- 3 with three (3) being the worse.
0 = no noticeable changes - coupons appear the same as before
1 = slight color change which is barely perceptible in very few
areas of the coupon
2 = color change which is perceptible in several areas
3 = severe color change of the coupon in general
Specimens: Specimens of the
packages to be tested shall be taken at random. A minimum of three
(3) specimen packages shall be used as a representative sampling
of the package style to be tested.
All specimens shall be conditioned
at 70- 76 degrees F, 45% - 55% RH for a minimum of 24 hours
prior to beginning the corrosivity tests.
Test Coupons: The following
metal coupons shall be used. Others more specific to the actual
products to be packaged may be used also.
Low Carbon Steel , QQ-S-698, condition 5
Aluminum Alloy , QQ-A-250/4, 2024 bare
Copper, ASTM-B451, nominal thickness 0.014 inches or more
Silver Plated Copper, plating thickness 100 - 200 microinches
Tin-Lead Eutectic Solder (SN63) on Copper, thickness 200
- 500 microinches, J-STD-006
Stainless Steel, unified numbering system UNS31400
All coupons shall be conditioned at 70- 76 degrees F, 9% - 15%
RH for a minimum of 24 hours prior to beginning the corrosivity
All coupons shall be clean of all contaminates prior to beginning
tests. Cleaning and preparation methods shall conform to Federal
Test Standard 101C, Method 3005
1. One each of the coupons
shall be placed in each specimen package.
2. The coupons shall be arranged so that they are not in contact
with each other. If the specimen packages are too small to hold
all seven coupons without contact with each other, the number
of specimen packages shall be increased to hold a total of three
(3) coupons of each metal type.
3. The coupons shall be placed with one side in direct contact
with the inside bottom of the specimen package.
4. The top side of the coupon shall be exposed unimpeded to the
atmosphere of the inside of the package.
5. Each specimen package shall be closed as specified by the manufacturer.
6. Each specimen package shall be placed in a preconditioned chamber
set to the following conditions: 118 - 122 dgrees F,
62% - 68% RH
7. The specimen packages shall remain at these conditions for
72 hours after which time they are removed and the coupons graded
Other conditions and periods of exposure may be used if they are
determined to be more application specific to the package use.
1. Corrosion: determination of the existence of any
corrosion. Comments shall be made on the observed severity of
2. Stain: grade of the stains observed on all coupons.
3. Test Conditions and coupons if different to those called
out in this test method.
No pass/fail criteria are implied in this test method. Each
user of this test method must make the decision of pass/fail based
on the application of the test packages.