[Code of Federal Regulations]
[Title 16, Volume 2]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 16CFR1209.5]
[Page 286-288]
TITLE 16--COMMERCIAL PRACTICES
CHAPTER II--CONSUMER PRODUCT SAFETY COMMISSION
PART 1209_INTERIM SAFETY STANDARD FOR CELLULOSE INSULATION--Table
of Contents
Subpart A_The Standard
Sec. 1209.5 Test procedures for corrosiveness.
This section prescribes the procedures for determining the
corrosiveness of cellulose insulation. Cellulose insulation shall be
tested for corrosiveness using the measured settled density, obtained by
following the test procedure at Sec. 1209.4, to calculate the amount of
distilled or deionized water to add to the test specimens. Determination
of corrosiveness shall be in accordance with the following test
procedure:
(a) Apparatus and materials--(1) Humidity chamber. A forced-air
humidity chamber capable of maintaining 48.91.7
[deg]C (1203 [deg]F) and 97 1.5 percent relative humidity.
(2) Crystallizing dishes. Six glass crystallizing dishes, 90 mm
(3.54 in) diameter by 50 mm (1.9 in) height.
(3) Test coupons. (i) Two aluminum coupons. 3003 bare aluminum, zero
temper.
(ii) Two copper coupons. ASTM B 152, type ETP, Cabra No. 110 soft
copper.
(iii) Two steel coupons. Low carbon, commercial quality, cold
rolled, less than 30 carbon content, shim steel.
Each coupon shall be 50.8 by 50.8 mm (2 by 2 in) by 0.076 mm (0.003 in)
thick metal free of tears, punctures, or crimps.
(4) Test specimens: Six test specimens of insulation shall be used
for one test. Each specimen shall weigh 20g (0.7 oz).
(b) Procedure--(1) General procedures for cleaning all metal
coupons. The metal coupons shall be cleaned by the following method:
(i) At no time during the fabrication, cleaning or testing shall the
metal coupons be touched by ungloved hands.
(ii) Gloves shall be clean and in good condition.
(iii) All chemicals used shall be of American Chemical Society
reagent grade or better, free from oily residues and other contaminants.
(iv) Water shall be distilled or deionized water.
(v) Handle cleaned coupons only with clean forceps.
(vi) In order to avoid exposing laboratory personnel to toxic fumes,
the commission recommends that all cleaning procedures be performed in a
fume hood.
(vii) Clean the coupons by vapor degreasing with 1,1,1-
trichloroethane for ten minutes. Following vapor degreasing, subject the
coupons to caustic and/or detergent washing as appropriate. Following
caustic or detergent washing, rinse the coupons in flowing water to
remove residues. Inspect each coupon for a water-break free surface. (A
water-break is a break, separation, beading or retraction of the water
film as the coupon is held vertically after wetting. As the coupons are
cleaned, the water film should become gradually thinner at the top
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and heavier at the bottom.) Hot air dry the coupons at 105 [deg]C (221
[deg]F).
(2) Specimens of cellulose insulation submitted for testing shall be
blown, combed, or otherwise mixed to reasonably assure homogeneity in
the cellulose insulation test specimens.
(3) Before presaturating each 20g (0.7 oz) test specimen, subdivide
it into two 10g (0.35 oz) portions. The quantity of distilled or
deionized water to be used for each 10g (0.35 oz) portion shall be
determined using the following formula:
ml distilled water = 46 / (settled density, Kg/m \3\) x 75
or
ml distilled water = 2.9 / (settled density, lb/ft \3\) x 75
(4) Presaturate each 10g (0.35 oz) portion with the determined
amount of water. Place one presaturated 10g (0.35 oz) portion into a
crystallizing dish, tamp level using the bottom of a clean suitably
sized glass beaker. Place a metal coupon onto the presaturated
insulation portion and center it in a horizontal plane. Place the other
presaturated 10g (0.35 oz) portion into the crystallizing dish on the
metal coupon and tamp the composite specimen (metal coupon plus
saturated insulation in the crystallizing dish) to assure an even
distribution of this material and to assure good contact of the
insulation with the metal. Exercise care in preparing the composite
specimens to eliminate air pockets from forming next to the metal
coupons.
(5) Do not cover the crystallizing dish. (Care should be taken to
avoid evaporation from the composite specimen while it is being prepared
until it is placed in the humidity chamber.) If dripping occurs in the
chamber, position a drip guard in the chamber to divert condensation to
the chamber floor. Repeat the above for the other metal coupons. Place
all six composite specimens into the humidity chamber. The chamber shall
be preconditioned to 48.9 1.7 [deg]C (120 3 [deg]F) and 97 1.5 percent
relative humidity. The specimens shall remain in the chamber for 336
4 hours. (Keep the chamber door open a minimum of
time while placing composite specimens in and removing them from the
chamber.)
(6) Upon completion of the test disassemble the composite specimens.
Thoroughly wash the metal coupons under running water and lightly brush
them using a soft nylon bristle brush or equivalent to remove loose
corrosion products. Remove the remaining corrosion products from the
metal coupons by cleaning them in accordance with the following
practices: \1\
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\1\ These practices are the recommended practices in ``ASTM G1--
Standard Recommended Practice for Preparing, Cleaning, and Evaluating
Corrosion Test Specimens,'' published by American Society for Testing
and Materials, 1916 Race Street, Philadelphia, Pa. 19103.
---------------------------------------------------------------------------
(i) Technique 1--Electrolytic Cleaning. This technique can
be used for post-cleaning the tested copper, steel and aluminum coupons.
Description: Electrolyze the coupons as follows: Make a solution
containing 28 ml of sulfuric acid (specific gravity 1.84), 2 ml of
organic inhibitor, e.g. aobut 0.5 g/liter of such inhibitors as
diorthotolyl thiourea, quinoline ethiodide, or betanaphthol quinoline
may be used, and 970 ml of water. The solution shall be at 75 [deg]C
(167 [deg]F). The anode shall be carbon or lead, and the cathode shall
be one metal coupon. The electrolyzing shall run for 3 minutes at a
current density of 20 A/dm\2\. Caution: If lead anodes are used, lead
may deposit on the coupon. If the coupon is resistant to nitric acid,
the lead may be removed by a flash dip in 1 + 1 nitric acid (plus
water). To avoid injury in this and subsequent techniques when mixing
acid and water, gradually pour the acid into the water with continuous
stirring, provide cooling if necessary.
(ii) Technique 2--Copper. This technique or Technique
1 can be used for post-cleaning the tested copper coupons only.
Description: Make a solution containing 500 ml of hydrochloric acid
(specific gravity 1.19), 100 ml of sulfuric acid (specific gravity
1.84), and 400 ml of water. To avoid injury, prepare the solution by
slowly adding the sulfuric acid to the water with continuous stirring.
Cool, then add the hydrochloric
[[Page 288]]
acid slowly with continuous stirring. The solution shall be at room
temperature. Dip the coupons in the solution for 1 to 3 minutes.
(iii) Technique 3--Steel. This technique or technique
1 can be used for post-cleaning the tested steel coupons only.
Description: Use one of the following two solutions:
Solution 1. Add 100 ml of sulfuric acid (specific gravity
1.84), 1.5 ml organic inhibitor, and water to make a l liter solution.
The solution shall be 50 [deg]C (120 [deg]F). Dip the coupons in this
solution.
Solution 2 (also referred to as Clarke's solution). Add 20
g of antimony trioxide and 50 g of stannous chloride to 1 liter of
hydrochloric acid (specific gravity 1.19). The solution shall be stirred
and be used at room temperature. Dip the coupons in this solution
stirring the solution at a rate such that deformation of the coupons
does not occur. This dipping shall last for up to 25 minutes.
(iv) Technique 4--Aluminum. This technique or technique
1 can be used for post-cleaning the tested aluminum coupons
only.
Description: Make a 1 liter solution by adding 20g of chromic acid, and
50 ml of phosphoric acid (specific gravity 1.69), to water. The solution
shall be 80 [deg]C (176 [deg]F). Dip the coupons in this solution for 5-
10 minutes. If a film remains, dip the coupons in nitric acid (specific
gravity 1.42) for 1 minute. Repeat the chromic acid dip. Nitric acid
alone may be used if there are no deposits.
(7) After cleaning, examine the metal coupons over a 40-W appliance
light bulb for perforation.
(c) Noncorrosiveness. Noncorrosiveness shall be determined by the
absence of any perforations (excluding notches which extend into the
coupon 3 mm or less from any edge) on each of the six test coupons when
the coupons are observed over a 40-W appliance light bulb.