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Specifications
 SCOPE
This specification is intended to identify and set minimum standards for those qualities of material and workmanship needed in reinforced plastic laminates for extended exterior service.
RAW MATERIAL
A. Resins - Resins shall be thermosetting, medium reactivity, rigid, fire-resistant polyester.
B. Glass Fiber - Glass fiber reinforcement shall be K filament type E borosilicate glass having high performance chrome-complex or silane finish compatable with polyester resin.
C. Gelcoat - Exterior surface coating shall be ultraviolet light stabilized, weather-resistant, polyester base containing fade resistant color pigments, and such inert extenders as are appropriate to maintain total pigment volume concetration less than 20%.
D. Interior Coating - Interior laminate coating when required shall be a pigmented heat resistant high gloss polyester base surfacing sealer.
E. Other Materials - Organic peroxide catalysts and promoters appropriate to the resin type shall be used as necessary to provide a thorough cure.
STANDARDS
A. Structural Standards - Minimum structural standards of the finished laminate shall be as follows:
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| Tensile Strength (ASTM D-638) |
8,180 psi |
Flexural Properties (
ASTM D790)
|
6,040 psi |
| Tangent Modulus of Elasticity |
407.3 ksi |
| Compressive Strength (ASTM D695) |
19,350 psi |
| Water Absorption (ASTM D570-59aT) |
5% |
| Charpy Impact Test (ASTM D256) |
3.0 |
| Impact Resistance (ASTM D2444) |
37.5 ft-lbs |
| Flammability (ASTM D635) |
Self-Extinguishing |
| Ultraviolet Protection |
Nominal 0.14" gelcoat |
B. Visual Standards - Visual standards of the finsihed laminate shall conform to Table 5, ASTM C582.
CONSTRUCTION
A. Construction details and overall dimensions shall be according to the drawings.
B. All exterior gelcoat shall be applied to produce a cured film of 0.014 inch plus or minus 0.005 inch thickness.
C.
Distribution of glass reinforcement shall be uniform except that in areas of stress concentration where local reinforcement shall be added as required.
D. All sections shall be molded in one peice. Female molds shall be employed to produce high sheen, smooth and uniform exterior surfaces.
E. To assemble enclosures, sections may be bolted or cemented at the factory or at the job site.
F. Doors shall be of identical material and construction as enclosures. Door latching provisions shall result in snug fit of the door to the frame, with means provided on each door for a padlock. All door and exterior hardware shall be constructed on non-ferrous materials.
G. Ventilators shall be as specified to allow proper trasnfer of air through the enclosure.
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