Alro logo Alro Steel was established in 1948 by Al and Robert Glick. Today, Alro is comprised of Alro Steel, Alro Metals, Alro Plastics and Alro Metals Outlet.


Alro Plastics offers a wide range of Industrial Grade Laminates in sheet, rod, tubing and fabricated parts made to print. Industrial Laminates are usually made using at least two components such as a reinforcing substrate and a thermoplastic resin binder, then cured with high temperature and pressure. The reinforcing substrate can be glass cloth, glass mat, filaments, canvas cotton fabric, linen cotton fabric, paper, graphite fabric, and others. While the thermoplastic binder resin which serves to adhere the layers together can be epoxies, melamine, phenolics, polyesters, silicones, and others.

Micarta (Phenolic) is a trademark of Norplex-Micarta industrial high-pressure laminates. Common uses of modern high-pressure laminates are electrical insulators, printed circuit board substrates, and knife handles.

Industrial Laminates also have their own set of standards which are determined by NEMA (National Electrical Manufacturers Association). NEMA standards are set and minimum values are published. Below are some of the most commonly used NEMA thermoset laminate grades:

Electrical Grade Laminates Electrical Grade Laminates


Phenolic C consists of a cotton canvas fabric and general-purpose phenolic resin. The product is easy to machine and operates with less noise than metal. In addition, this material is not as abrasive as fiberglass alternatives when used in wear applications.

PHENOLIC CE (Canvas Electric)

Phenolic CE (NEMA CE) consists of a cotton canvas type fabric and electrically insulating phenolic resin system. Phenolic CE is easy to machine and operates with less noise than metal.

Phenolic CE Typical Properties Phenolic CE Typical Properties
Phenolic CE MSDS Phenolic CE MSDS


Phenolic LE (NEMA LE) is used where better machining is needed compared to that offered by canvas grades This product consists of a fine-weave linen fabric and electrical grade of phenolic resin.

Phenolic LE Typical Properties Phenolic LE Typical Properties
plastic MSDS Phenolic LE MSDS

Phenolic XX (Nema XX)

Phenolic XX (NEMA XX) is a paper based phenolic that is a machining grade with less robust electrical properties than those of Phenolic XXX. Designed for electrical insulation, the product can be used in dry or high humidity conditions.

Phenolic XX Typical Properties Phenolic XX Typical Properties
Phenolic XX MSDS Phenolic XX MSDS

G-7 (Glass Silicone)

A continuous glass fabric laminated with a silicone resin. Grade G-7 is unequalled for high heat and arc resistance applications, and where good mechanical and electrical properties must be exhibited in humid conditions in excess of 500°F.

G-9 (Glass Melamine)

G-9 is a continuous woven glass fabric laminated with a melamine resin. Grade G-9 has good mechanical properties plus high resistance to flame, heat, arcing, and most strong alkali solutions. It is recommended for use where good mechanical properties are needed under wet conditions.

G-10 / FR4 (Glass Epoxy)

G-10 / FR4 is a continuous woven glass fabric laminated with an epoxy resin. This grade is extremely high in mechanical strength, has low water absorption and dissipation factors and has superior electrical characteristics, which are exhibited over a wide range of temperatures and humidity. Grade G-10 is used for terminal boards, washers, sleeves, structural components, and parts where the strength to size ratio is critical.

PHENOLIC G-10 / FR4 Typical Properties G-10 / FR4 Typical Properties

G-11 (High Temp Glass Epoxy)

G-11 is a grade similar in composition and properties to Grade G-10 but more suitable for continuous use at elevated temperature. G-11 retains at least 50% of its structural strength at continuous operating temperatures in excess of 300°F. Due to its high cost, G-11 applications are limited to only the most critical high heat situations.



GPO-3 is an electrical grade sheet laminate produced by using polyester resin and fiberglass reinforcement. They are U.L. recognized and are available in 36” x 72” and 48” x 96” sheets. Track resistant, flame retardant laminate which meets or exceeds NEMA GPO-3 requirements.

Acculam® Matrix HT™

Matrix HT maintains rigidity with excellent dimensional stability and creep resistance over wide temperature ranges, as well as good resistance to moisture, chemicals, alkali and acids. It does not melt or soften at high temperatures, and offers users extended application capability beyond typical NEMA grades.