Reinforced plastics pressure-bag

Boat hulls were among the earliest applications of modern reinforced plastics. The United States Navy introduced their first 8.5 m (28 foot) fibreglass personnel boat in 1947, and was contracted to pass 3000 vessels by 1966. The orders for the first two vessels specified construction by the pressure bag method and by the vacuum injection system in order to achieve higher quality than was obtained by the then current hand-lay-up technique [1]. One of the earliest large GRP structures for submerged... 

In addition to steels materials of construction include all types such as aluminum, copper, and beryllium-copper. Examples of other different types include wood and plastic for thermoforms and reinforced plastics (RPs). RP tools also include vacuum and pressure flexible bags. Operations of tools vary from fabricating solid to foamed products such as using a steam chest for producing expandable polystyrene foams. 

O Open-Mold Process n Any technique for fabricating reinforced plastics in which a one-sided male or female mold is used, with no or low pressure being required. See Hand Layup, Sprayup, and Bag Molding. 

Rules for fiberglass-reinforced plastic (FRP) pressure vessels are covered in Section X of the ASME pressure vessel code. Construction of FPR vessels is divided into four classes the contact molding, bag molding, centrifugal casting,... 

Pressure bag compacting compacting reinforced plastics moulding by applying air pressure inside a heated vessel, as opposed to vacuum bag compacting (qv). 

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