Hand Lay-Up

Hand lay-up is suited for making high strength parts of any size at low to medium production volumes. A combination of reinforcements, including chopped strand mat and woven roving, is laid into an open mold with a gel-coat surface and impregnated with resin layer by layer. 1/4” or 3/16” fiberglass thickness.

Spray-Up

Spray-up uses multi-end roving fed into a "gun" that is chopped into bundles of predetermined length. The bundles are sprayed into a resin stream and deposited onto a male mold. The resin is manually rolled into the reinforcement to remove any air pockets and to produce a consistent part. Once the resin cures, the finished part is removed from the mold. The part is then painted with a surface coat. 
see www.owenscorning.com

Robotic Spray-Up

Robotic spray-up is a process whereas the operator programs the robot to spray a uniform spray pattern on a mold. After programming, the robotic arm then automatically sprays a resin stream and chopped strands of fiberglass onto the male mold. This process is similar to the hand spray up, except it is done automatically by a robotic arm. 

Compression Molding (SMC)

Compression molding is a mass production method where molding compounds and other resin glass combinations are compressed in matched metal tools located between the platens in a press. Pressures of 150 lbs/in2 and temperatures between 265ºF (130ºC) and 300ºF (149ºC) are required. Typical cycle times of 2 - 3 minutes are achieved. Molding compounds comprised of a thermoset resin, chopped roving, fillers and a catalyst are used in both sheet form (SMC). SMC is placed in the tool to produce parts such as PRMC tops and bases, CGS ground sleeves and CBP Box Pads. 
see www.owenscorning.com

Injection Molding

Injection molding is a closed-molding process where filled or unfilled polymer resins are injected into closed match metal molds. Polymers are commonly thermoplastic, and processed by heating the raw polymer in pellet form to melt point and injecting it into the cooled mold. PSP pedestals are made by this process.
see www.owenscorning.com

Cold Press Molding

Cold press molding, a semi-open molding process, requires lighter duty, matched steel tools mounted into a press. Reinforcements, usually continuous filament mats (CFM), are placed into the tool and a highly filled polyester resin is poured onto them. The press is closed and the part is cured. The process requires lower pressures, 15 - 100 lb/in2, and temperatures averaging 130ºF (55ºC). Cycle times are in the range of 6 - 7 minutes. Other glass fiber fabrics, mats, veils and pre forms are also used. The GSC-37-43 cover is made by this process. see www.owenscorning.com

Rotational Molding

Rotational molding process starts with a good quality mold that is placed in a molding machine that has a loading, heating, and cooling area. Several molds may be placed on the machine at the same time. Pre-measured plastic resin is loaded into each mold, and then the molds are moved into the oven where they are slowly rotated on both the vertical and horizontal axis. The melting resin sticks to the hot mold and coats every surface evenly. The mold continues to rotate during the cooling cycle so the parts retain an even wall thickness. Once the parts are cooled, they are released from the mold. The rotational speed, heating and cooling times are all controlled throughout the process.
see www.rotomolding.org