A Brief Modern History of Fiberglass

Why are so many boats made out of fiberglass, also called glass-reinforced plastic (GRP)? Learn the history about the material and the pros and cons of using it in marine applications.

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Examples of glass filler (microspheres) and glass material (cut fibers and two fabrics) for plastics reinforcement: glass microspheres (or glass beads); diameter: about 300 µm, specific gravity: 2.5. Mineral filler mainly used to increase the stiffness of a thermoset resin and to make road safety markings; 5 mm length chopped strands of fiberglass used to reinforce thermoset resins; fibrous reinforcements for thermoset resins: two glass fabrics with different area density; fiber orientation: 0 and 90° (most common): weave pattern: taffeta (down left, area density: 550 g/m2), and 2x2 twill (down right, area density: 280 g/m2). Credit: WikiCommons/CC BY-SA 3.0
Examples of glass filler (microspheres) and glass material (cut fibers and two fabrics) for plastics reinforcement: glass microspheres (or glass beads); diameter: about 300 µm, specific gravity: 2.5. Mineral filler mainly used to increase the stiffness of a thermoset resin and to make road safety markings; 5 mm length chopped strands of fiberglass used to reinforce thermoset resins; fibrous reinforcements for thermoset resins: two glass fabrics with different area density; fiber orientation: 0 and 90° (most common): weave pattern: taffeta (down left, area density: 550 g/m2), and 2x2 twill (down right, area density: 280 g/m2). Credit: WikiCommons/CC BY-SA 3.0

Fiberglass, also known as glass-reinforced plastic (GRP), has been an integral material in modern engineering and design, especially within the marine industry. Its lightweight, durable, corrosion, and marine organism-resistant properties have made it a favored choice for boatbuilders since the mid-20th century. But what of its origins?
In my own search to understand how fiberglass swept the world by storm, I set out to trace the material’s historical development, technical composition, and ‘revolutionizing’ impact on the marine industry, particularly in recreational and competitive sailing.

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Angie Richard
Angie is a multidisciplinary storyteller, researcher and academic, exploring how creative practitioners can drive science and envision regenerative futures. Angie is self-building a Wharram Narai Mk IV wooden catamaran with her family, creating a Floating Stories Lab - a regenerative sailboat studio - to depart Europe on a circumnavigation, merging science, art, research, and storytelling to discover how humans can thrive on a flourishing planet. For the latest updates, visit www.voyagevirage.com or subscribe to the Floating Stories Lab Substack newsletter.

1 COMMENT

  1. Good article!

    Has the USEPA opened any recent discussion relating to regulation of disposal of used fiberglass vessels and other GRP structures as hazardous waste or as a special waste? I see one study in 1991, but it primarily addressed production wastes, such as uncured resins and solvents. My gut feeling is that this is so far down the priority list that a rule making effort could never find funding, at least at the federal level.

    It seems to me the hazards would be mostly airborne particulate of the sort OSHA can regulate, relating to the demolition process, but not from residing in the ground. If anything was going to leach, it most has over time, and the toxicity of the leachates that occur will fall in the usual range of landfill leachate, which itself is not a basket of fruit. I’ve been involved in the engineering and operation of treatment systems.

    Interesting.