| |
ARAMID
(Kevlar) |
COTTON
(Spur Yarn) |
GLASS
(Fiberglass) |
MANILA
(Natural Fiber) |
NYLON
(Multifilament) |
POLYESTER
(Multifilament) |
POLY-
PROPYLENE
(Monofilament) |
POLY-
PROPYLENE
(Multifilament) |
BREAKING
TENACITY
(Grams per Denier) |
21.7 gpd |
3 to 5 gpd |
9.6 gpd |
5 to 7 gpd |
5.7 to 9.5 gpd |
6 to 9.5 gpd |
3.5 to 7 gpd |
2.5 to 8 gpd |
SPECIFIC
GRAVITY |
1.44 |
1.54 |
2.5 |
1.5 to 1.6 |
1.14 |
1.38 |
0.91 (floats) |
0.91 (floats) |
STRETCH
ELONGATION
AT BREAK POINT |
2.5% |
3 to 7% |
3.1% |
5 to 13% |
15 to 28% |
12 to 14% |
14 to 30% |
20 to 100% |
ELASTIC
RECOVERY |
100% |
74 at 2%
45 at 5% |
100% |
75 at 2% |
99 at 5%
89 at 8% |
99 at 2%
88 at 5% |
98 at 5% |
98 at 5%
95 at 10% |
MOISTURE
ABSORBANCY |
4.5% |
24% to 27% |
None |
30% to 35% |
4.2% to 8% |
0.4% |
Negligible |
Negligible |
EFFECT
OF HEAT |
Decomposes
at 930° F. |
Decomposes
at 302° F. |
75% Tensile
at 65° F.
Melts at 2050° F. |
Loses Strength
over 180° F. |
Yellows
at 300° F.
Melts at 480° F. |
Melts at 482° F. |
50% Tensile
at 200° F.
Melts at 330° F. |
50% Tensile
at 200° F.
Melts at 320° F. |
EFFECT OF
ACIDS |
Resists most acids. Some strength lost after long exposure. |
Disintegrates
in concentrated
solutions |
Resists most acids |
Disintegrates
Very poor |
Good resistance.
Dissolves in sulfuric acid. |
Good resistance.
Dissolves in sulfuric acid. |
Good resistance except with oxidizing agents. |
Good resistance except with oxidizing agents. |
EFFECT OF
ALKALIS |
Generally good resistance |
Swelling, but
no damage |
Unaffected |
Very poor |
Inert |
Moderate |
Good resistance |
Good resistance |
EFFECT OF
ORGANIC
SOLVENTS |
Unaffected.
Should no be bleached. |
Resistant to
common solvents |
Unaffected |
Poor resistance |
Resistant.
Soluable in phenolic and formic acid. |
Resistant. Soluable in phenolic acids. |
Insoluable in most except chlorinated hydrocarbons. |
Insoluable in most except chlorinated hydrocarbons. |
EFFECT OF
SUNLIGHT |
Loses strength after prolonged exposure |
Loses strength |
Excellent
resistance |
Loses some
strength |
Loses strength after prolonged exposure. |
Loses strength after prolonged exposure. |
Good resistance
if UV-stabliized |
Good resistance to indirect sunlight. |
EFFECT
OF AGE |
Excellent resistance |
Negligible |
Excellent resistance |
Negligible |
None |
None |
Negligible |
Negligible |
RESISTANCE
TO MILDEW |
Not attacked |
Poor unless bleached |
Not attacked |
Poor |
Not attacked |
Not attacked |
Not attacked |
Not attacked |
ABRASION
RESISTANCE |
Good |
Good resistance |
Good |
Good |
Excellent
resistance |
Excellent
resistance |
Good resistance |
Good resistance |
| IDENTIFICATION |
Does not melt.
Decomposes at 930° F. |
Burns rapidly |
Does not burn.
Melts at 2050° F. |
Burns like wood,
hairy fibers |
Melts before burning. Forms hard bead. Celery odor. |
Melts before burning. Forms hard bead. Pundent odor. |
Floats.
Melts before burning. Forms hard bead. Burning asphalt odor. |
Floats.
Melts before burning. Forms hard bead. Burning asphalt odor. |
