There are many different fiberglass molding processes, including compression molding, blow molding, rotational molding, injection molding and dip molding, among others. Read More…
Leading Manufacturers
All Plastics and Fiberglass, Inc.
Mobile, AL | 800-226-1134With over 100 years combined experience, All Plastics and Fiberglass has the experience to handle all your fiberglass needs. No matter how large or small the job is, AP & F is committed to a process that ensures the highest quality fiberglass fabrications.

Janco Engineered Products
Mishawaka, IN | 574-256-3169Our fiberglass items are a great alternative to metal. These products are not only flexible and lightweight but also very durable. Turn to us for your fiberglass fabrication needs. Our engineers can create fiberglass protective coverings, machine housings and more. Our teams utilize open molding and infusion to ensure the quality of our items. Please give us a call today!

Diamond Fiberglass Fabricators
Victoria, TX | 361-572-4040When ordering a Diamond vessel, customers are receiving the best in Fiberglass Reinforced Plastic (FRP) fabrications. Diamond is an ASME RTP-1 Certified Fabricator and it's comprehensive quality assurance program was developed in-house and is continuously improved to meet or exceed industry standards for fabrication and testing for FRP vessels.

Progressive Fiberglass Fabricators, Inc.
Pearland, TX | 281-485-8638Make your choice for fiberglass products the progressive one! At Progressive Fiberglass we specialize in unusual & custom fiberglass fabrication for industrial & commercial parts. Fiberglass products & capabilities we offer include fiberglass molding, fiberglass enclosures & fiberglass tanks. We are a quality oriented company & pride ourselves on competitive bidding & guaranteed on time delivery.

Since its introduction, fiberglass has been used as a reinforcing agent for plastics and as insulation in buildings, homes, stoves, refrigerators, furnaces and in many other applications throughout industry, commerce and in consumer products contexts. Fiberglass moldings are low weight, high strength and scratch resistant. Many boat hulls, go-kart bodies, large storage tanks and automobile parts can be made of molded fiberglass.
Fiberglass molding can be used to make fiberglass sheets, panels, pipes and a wide variety of other shapes. A range of different fiberglass compositions are available to suit the many contexts in which fiberglass moldings are applied. Just a few of these compositions include E-glass, A-glass, E-CR-glass, C-glass and R-glass, each of which features its own properties of strength, durability, UV and corrosion resistance, optical clarity and color.
The three main methods of fiberglass molding are open molding, closed molding, and centrifugal molding. In open molding, a layer of gel coat is applied and cured in a one-piece mold or structure. After being layered into the mold, the fiberglass and sprayed resin are allowed to cure. During closed molding the initial gel coat is applied in a two-part mold.
Fibers in the form of chopped fibers or laminated sheets are sprayed or placed in the female part of the mold on top of the gel coat. The part cures after being sealed in the mold by a vacuum and having catalyzed resin injected into the pressurized mold. In centrifugal molding, the gel coat is applied to the sides of a spinning cylindrical mold.
Layer by layer, catalyzed resins saturated with short fibers are sprayed into the mold until the desired thickness is reached. Centrifugal molding is used to form cylindrical products such as pipes and tanks. In all three processes, the end products are extracted from their molds and subject to any necessary surface treatments or other finishing processes.