At ESPE Manufacturing Co., Inc., we take pride in being a trusted source for reliable electrical insulating materials and precision-fabricated plastic components. We keep a large inventory of insulation materials ready for conversion and fabrication, giving our customers fast turnaround and dependable service. Whether you need rolls, sheets, or custom-cut parts, our selection of Mylar material, Formex material, ITW Formex, Nomex paper, and Fishpaper provides dependable electrical and mechanical protection in a wide range of systems.
A Full Range of Electrical Insulating Materials
ESPE offers a comprehensive selection of non-metallic materials designed for electrical insulation and mechanical support. Each material is chosen for its specific combination of dielectric strength, heat resistance, and dimensional stability. From flexible films and papers to rigid laminates and engineered plastics, we can supply or fabricate what your project requires.
Our material options include:
- Formex material / ITW Formex (Flame-Retardant Polypropylene)
- Fishpaper (Vulcanized Fibre)
- Nomex paper (Aramid Insulation Paper)
- Mylar material (Polyester Film)
- G10/FR4 Epoxy Glass, Phenolic, Nylon, PTFE (Teflon), Delrin, and other specialty plastics
Each one offers distinct properties that support performance, safety, and reliability in electrical assemblies and fabricated components.
Formex Material and ITW Formex
Formex material, produced by ITW, is one of the most popular options for electrical insulation because of its excellent flame-retardant properties and electrical performance. ITW Formex is a type of polypropylene material engineered to meet UL 94V-0 flame rating, which makes it a top choice for electronics, power distribution, and telecommunication systems.
Its combination of flexibility and mechanical toughness allows it to be formed, folded, and die-cut without cracking or losing its insulating value. That’s why it’s commonly used for insulation barriers, circuit board supports, electrical housings, and enclosures.
Fishpaper
Fishpaper is a tried-and-true material that remains in demand for many electrical insulation applications. Made from vulcanized fibre, it offers a balance of strength, flexibility, and dielectric performance at an economical cost. It can be easily punched, cut, folded, or formed, which makes it suitable for custom electrical components.
This material is often used for gaskets, washers, switch plates, spacers, and arc barriers. It performs well in dry electrical environments and is resistant to wear and mechanical stress. Because of its low cost and versatility, Fishpaper remains a dependable choice for many electrical and mechanical uses.
Nomex Paper
Nomex paper is an aramid-based insulation product developed by DuPont, known for its superior strength and resistance to heat. It maintains its electrical properties even in high-temperature environments, withstanding up to 220°C without degrading. That makes it an excellent choice for transformers, electric motors, generators, and battery insulation.
Nomex paper also offers high dielectric strength and mechanical durability, making it suitable for applications where both electrical insulation and toughness are needed. Because it’s flexible yet strong, Nomex can be slit, punched, or laser-cut to precise specifications.
Mylar Material
Mylar material is a polyester film known for its combination of toughness, clarity, and electrical strength. It remains dimensionally stable under heat, resists moisture, and can handle exposure to oils and chemicals—qualities that make it ideal for insulation barriers and protective layers in electrical equipment.
Customers rely on Mylar for applications such as motor insulation, slot liners, gaskets, spacers, and circuit insulation barriers. Its flexibility allows it to be die-cut or laser-cut into any shape, making it easy to integrate into your electrical assemblies or fabricated parts.
Other Electrical and Plastic Materials
In addition to Mylar, Formex, Nomex, and Fishpaper, ESPE offers a wide selection of other electrical insulating materials and engineering plastics. Each one serves a distinct purpose, giving you flexibility when choosing materials that match your project’s temperature, strength, and dielectric requirements.
Some of our other materials include:
- Vulcanized Fibre (Red Fibre) – Durable mechanical insulation used for washers and spacers.
- G10 / FR4 Epoxy Glass – Rigid, flame-retardant laminate known for strength and excellent electrical insulation.
- Phenolic (Bakelite) – Strong and machinable plastic often used in switchgear, terminals, and insulating bases.
- Polycarbonate and Acrylic – Clear, impact-resistant plastics ideal for covers, guards, and protective panels.
- PTFE (Teflon) – High-temperature, non-stick insulation with excellent chemical resistance.
- Nylon and Delrin – Tough engineering plastics used for bushings, bearings, and precision parts.
Each of these materials can be supplied as full sheets, rolls, or cut and machined to specification. ESPE’s inventory and fabrication capabilities make it possible to deliver fast, consistent, and cost-effective results for projects of all sizes.
Fabrication and Conversion Capabilities
Having the right materials is just part of the equation—how they’re fabricated matters just as much. ESPE combines decades of experience with advanced cutting and machining technology to deliver precision-finished insulation components.
Our shop includes equipment for die cutting, laser cutting, stamping, CNC machining, slitting, and shearing. Whether you need tight-tolerance custom shapes or high-volume production runs, we have the capability to complete your order efficiently.
Common fabricated products include:
- Nomex washers and spacers
- Formex insulation shields and barriers
- Fishpaper gaskets and arc chutes
- Mylar insulators and protective films
By combining our broad material selection with in-house fabrication, ESPE provides customers a single source for both material supply and finished components.
Quality and Compliance
All of our materials and processes follow strict quality standards. ESPE Manufacturing Co., Inc. operates under an ISO 9001-certified system and complies with UL, RoHS, and REACH requirements. We track material lots and maintain documentation to ensure consistent quality and traceability for every order.
Customers who rely on high-performance insulation—such as those in electronics, power distribution, medical equipment, or telecommunications—trust our materials to perform consistently. Every electrical insulating material we supply is verified for thickness, electrical strength, and dimensional accuracy before shipment.
Partner with ESPE Manufacturing Co., Inc.
For over 75 years, ESPE Manufacturing has supplied companies across multiple industries with dependable insulation materials and custom-fabricated parts. Whether you need Formex, Fishpaper, Nomex paper or Mylar material, our team is ready to support your project with the right material and precise fabrication.
If you’re unsure which insulation product best fits your application, our experienced staff can guide you through the options and recommend the best match for performance, budget, and production needs.
Contact ESPE Manufacturing Co., Inc. today to request a quote, discuss your specifications, or learn more about how our materials can support your next electrical or industrial project.