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ASTM D 2343

350,000 psi

ASTM D 2343

12,000,000 psi

ASTM D 578

1341 ft/lb

ASTM C 693

0.093 lb/in3

Table 6. Properties of Owens-Corning 158B Type 30 Glass Roving

Property Tensile Strength Tensile Modulus Yield Density

The resin system is an amine-cured epoxy formulation developed by Lincoln Composites to address the operating environment and manufacturing considerations for plastic liners. Because the characteristics of this resin are unique and not generally available in commercial systems, Lincoln Composites regards the resin formulation as proprietary. Typical properties of resin are provided in Table 7.

Tensile Strength

ASTM D 638

13,500 psi

Tensile Modulus

ASTM D 638

460,000 psi


ASTM D 638

7.0 %

Shear Strength

ASTM D 732

8,100 psi

Specific Gravity

ASTM D 792


Tg, Dry, DMA

ASTM D 4065

246 F

Tg, 24 Hour Water Boil, DMA

ASTM D 4065

229 F

Degradation Temperature, TGA

ASTM D 3850

680 F

Table 7. Properties of the Lincoln-Formulated Neat Epoxy Resins




Between the composite shell and the polymer liner, a thin annular rubber shear ply is applied to the flange of the end bosses. By virtue of its low shear modulus, the shear ply precludes frictional contact between the end boss and the composite shell accounting for the differential strain that exists between the two surfaces. The shear ply is formed of a nitrile Buna rubber with an ASTM D 2000 material designation of M2CH-614-A25B14EF31. A coating of paint is applied over external surfaces of the composite shell. The paint improves aesthetics of the tank.


Current steel tank designs typically use a sidewall connection location for penetrating the vessel wall. Implementation of a side port in a filament-wound pressure vessel provides several challenges. The first challenge is to add the side port to the liner wall. For a tank with a non- metallic liner and a non-metallic overwrap, the side port addition would involve welding a circular disk, which is manufactured to match the curvature of the tube, into the cylinder section of the liner. The second challenge is the creation of wind patterns that accommodate the disruption to the winding path created by the port. The larger the port, the more difficult it will be to accommodate. The final challenge to this approach is to ensure that the opening in the composite created by the side port retains enough strength to contain the port under pressure. It

Alternative Underground Propane Tank Materials, Phase II—Final Report


September 2009 Battelle and Lincoln Composites

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