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Polyethylene
Encasement:
ShoreMaster floats are manufactured from linear, virgin polyethylene resin containing UV inhibitors and carbon black pigment to protect against ultra violet degradation. This resin offers a balance of toughness, rigidity, environmental stress, crack resistance and low temperature impact performance unmatched by any other material. A nominal wall thickness of .15” is standard on all ShoreMaster floats unless a specific wall thickness is requested.
Shoremaster’s polyethylene resin is a food grade material in compliance with the FDA Title 21. As a food grade material, you are ensured that the float will not contaminate the waterway. The polyethylene resin is included in Underwriters Laboratory Class 746C and flame class UL-94HB. The molded encasements also meet the Hunt Falling Dart puncture and thickness test.
The polyethylene shell will conform to the following properties:
| Properties | ASTM |
Units |
Typical
Units |
| Density | D-1505 |
g/cc |
0.937 |
| Melt Index | D-1237 |
.50 |
|
| ESCR | D-1693(B) |
Hrs. |
1000 |
| Tensile Strength | D-638 |
psi |
2600 |
| Flexural Moduals | D-790 |
psi |
75,600 |
| Low Temp Impact | ARM-STD-40F |
ft-lbs |
51 |
| Brittleness Temp | D-746 |
0
deg C |
-90 |
| Heat Distortion Temp | D-648 |
0
deg C |
63 |
Expanded Polystyrene:
All ShoreMaster floats are filled with expanded polystyrene (EPS) beads. The EPS foam has a 0.9 to 1.2 pound per cubic foot density with water absorption not to exceed 3.0 pounds per cubic foot as determined in accordance with the Hunt absorption test. The EPS meets Underwriters Laboratory fire resistence standards UL723 and UL1975. The EPS contents will also conform to ASTM C-578 and ASTM E84 and the following properties:
| Properties | ASTM |
Units |
Value |
| Density | C-303 |
Min
lb./ft3 |
0.90 |
| Thermal Resistance | C-177
or C-518 |
Min
R for 1" Thickness |
|
| @ 25º F (-3.9º C) | 4.20 |
||
| 25º F (-3.9º C) | C-158 |
4.00 |
|
| 25º F (-3.9º C) | 3.60 |
||
| 25º F (-3.9º C) | 3.25 |
||
| Compressive resistance at Yield or 10% Deformation | D-1621 |
Min
psi |
10.0 |
| Flexural Strength | C-203 |
Min
psi |
25.0 |
| Water Vapor Permeability | E-96 |
Max
perm-in |
5.0 |
| Water Absorption | C-272 |
&
by Vol Max |
4.0 |
| Dimensional Stability | Max
% |
2.0 |
|
| Oxygen Index | D-2863 |
Min
% |
24.0 |
| Coefficient of Thermal Expansion | D-696 |
In/in/º
F |
0.000035 |
| Flash Ignition Temperature | D-1929 |
º
F |
824 |
| Auto-Ignition Temperature | D-1929 |
º
F |
896 |
| BTU Content | NFPA
259 |
BTU/lb. |
17,245 |