What is Fiberglass?

An overview of fiberglass tanks and fiberglass resins — how FRP is made, how resins are selected, and the common resin types used in chemical and water storage tanks.

Fiberglass resins form the polymer matrix that binds fiberglass fibers into a strong, durable, three-dimensional composite known as FRP (Fiberglass Reinforced Plastic). The resin contributes rigidity, chemical resistance, and long-term durability, while the fibers provide tensile strength.

How Fiberglass Works — When fiberglass fibers are combined with resin and applied to a mold, the resin is mixed with a catalyst that triggers an exothermic curing reaction. During curing, the resin cross-links and encapsulates the fibers, creating a lightweight yet robust composite structure. This chemical bonding process gives FRP its strength, corrosion resistance, and dimensional stability.

Resin Selection — Fiberglass resins are engineered for different environments and chemical exposures. Resins that perform well at ambient conditions may not be recommended at elevated temperatures, making proper selection essential for long-term performance.

Common Resin Types

Orthophthalic Polyester — Low cost, moderate chemical resistance; used for general-purpose, economical FRP components.
Isophthalic Polyester — Medium cost, good chemical resistance; used for industrial parts requiring improved corrosion resistance.
Vinyl Ester — High cost, excellent chemical resistance; used for chemical storage tanks and aggressive environments.

Each resin type includes multiple variants tailored for specific applications, temperatures, and chemical exposures.

Tank Manufacturing Expertise — Tanksystems designs and manufactures FRP tanks built to ASTM 3299 specifications for above-ground, filament-wound, vertical flat-bottom tanks. We provide industrial storage solutions in both single-wall and double-wall configurations, engineered for demanding chemical and environmental conditions.

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