|
LABORATORY TEST METHOD NO. H-11
WAX CONTENT IN DENTAL FLOSS
1. PURPOSE:
To determine wax content in waxed dental floss.
2. PRINCIPLE:
Wax is dissolved in tetrachloroethylene and its % wax content
is calculated using waxed dental floss weight vs unwaxed dental
floss weight.
3. APPARATUS AND MATERIALS:
3.1 Precision scale that can weigh as low as one thousandth of
a gram such as the Mettler Scale AE-200
3.2 Stainless steel cylinders 7.6 by 12.7 cm ( 3 by 5 in.) with
lids.
3.3 Tetrachloroethylene.
3.4 Two 4.5 m (5 yd) specimens from each package to be tested.
4. PROCEDURE:
4.1 Weigh each specimen ana record result to the nearest
hundredth of a gram.
4.2 Place specimens in stainless steel cylinder and cover
completely with tetrachloroethylene.
4.3 Close cylinder and allow specimen to submerge for 1 hour at
room temperature 25°C (78°F) .
4.4 Shake cylinder well, remove specimens and allow to air dry
for 3 hours at room temperature 25°C (78°F).
4.5 Weigh dry specimens and record results to the nearest
hundredth of a gram.
5. EVALUATION:
Determine wax content using this formula:
| (A-B) |
|
| _____ |
X 100 = % wax content by weight |
| A |
|
| |
|
|
A = Original weight of the specimen,
and
B = Weight of the specimen after wax is dissolved |
6. REPORT
Report the result as an average of five specimens.
_HARDLINES
TEST METHOD_
|
