Polycarbonate Sheet Fabrication and Machining for OEM Applications

Polycarbonate is the impact-resistant thermoplastic of choice for guards, viewing windows, protective shields, and structural covers across the OEM market. It’s roughly 250 times stronger than glass at half the weight, holds optical clarity, and machines cleanly when handled correctly. At Wm. F. McGraw & Co., we fabricate polycarbonate sheet to your drawings — cut, CNC-machined, drilled, routed, and finished — for production runs from one prototype to repeat orders.

What Is Polycarbonate?

Polycarbonate (PC) is an engineering thermoplastic built around carbonate groups in its polymer chain. That chemistry gives it three properties OEMs lean on heavily: extreme impact resistance, near-glass optical clarity, and good thermal performance up to roughly 240°F continuous service.

Polycarbonate is sold under brand names you’ll recognize — Lexan®, Makrolon®, Tuffak®, Hyzod® — and in a wide range of grades engineered for specific applications: clear, tinted, FDA-compliant, UV-stabilized, flame-retardant, glass-fiber-filled, and abrasion-resistant. The right grade depends on your application; our team can help select one if you’re unsure.

Property	Typical Value	Why It Matters
Tensile strength	9,000–10,500 psi	Strong enough for structural covers and load-bearing components
Impact strength (notched Izod)	12–18 ft-lb/in	Why it replaces glass — survives strikes that would shatter other plastics
Continuous service temperature	Up to ~240°F	Holds shape and properties in elevated-temp environments
Heat deflection temperature	270–290°F at 264 psi	Resists deformation under load and heat
Glass transition temperature	~297°F (147°C)	Defines the upper machining and forming limit
Light transmission (clear)	88–90%	Near-glass clarity for viewing windows and optical covers
Dielectric strength	380–400 V/mil	Suitable for non-load-bearing electrical insulation applications
Water absorption (24 hr)	0.15%	Stable in humid environments
Flame rating	UL 94 HB to V-0 (grade dependent)	Flame-retardant grades available for electrical enclosures
Density	1.20 g/cm³	About half the weight of glass at equivalent dimensions

Key strengths

Extreme impact resistance — survives strikes that shatter glass, acrylic, and most engineering plastics
Optical clarity — 88–90% light transmission in clear sheet
Lightweight — about half the weight of glass at equivalent dimensions
Good thermal performance — service to ~240°F continuous
Wide range of available grades — clear, FDA, flame-retardant, glass-filled, UV-stabilized
Highly machinable when correctly cooled and annealed

Limitations to design around

Lower scratch resistance than acrylic in uncoated form — abrasion-resistant coating available
Reduced UV stability uncoated — UV-stabilized grades for outdoor service
Vulnerable to certain solvents and strong alkalis
Stress-sensitive during machining — proper annealing matters

How do I get a quote?

Polycarbonate Grades We Fabricate

Polycarbonate isn’t one material — it’s a family of grades. We fabricate all of the major commercial grades; tell us your application and we’ll match it.

General-purpose clear polycarbonate

The standard grade — used for guards, covers, structural enclosures, and any application where clarity and impact resistance are the primary requirements.

FDA-compliant polycarbonate

Food-contact and medical applications — meets FDA requirements for direct contact with food, beverages, and medical fluids. Used for medical equipment housings, food-processing covers, and pharmaceutical equipment.

Flame-retardant polycarbonate (UL 94 V-0 / V-2)

Required wherever a UL flame rating drives the spec — electrical enclosures, transit interior components, and equipment used in regulated environments.

Glass-fiber-reinforced polycarbonate

Glass-filled grades trade some optical clarity for higher stiffness, dimensional stability, and load-bearing capacity. Used for structural components and parts that need to hold tight tolerances under load.

UV-stabilized polycarbonate

Engineered to resist yellowing and embrittlement under sustained UV exposure. The right choice for outdoor enclosures, transit glazing, and anything that lives in direct sunlight.

Abrasion-resistant polycarbonate

Surface-coated to resist scratching — used for viewing windows, machine guards, and any application where the sheet sees regular contact or wiping.

Bullet-resistant polycarbonate laminate

Multi-layer polycarbonate construction engineered to absorb projectile energy. Used for security barriers, ATM windows, and protective transit components.

Our Polycarbonate Fabrication Capabilities

We don’t just stock polycarbonate — we fabricate it to your specifications. Every job is handled in-house at our Riverview, Michigan facility.

CNC machining — milling, drilling, tapping, and 3-axis profiling to drawing
Precision cutting — saw cutting, routing, and laser cutting (where appropriate for the grade)
Drilling and counterboring — including the slow-feed, controlled-cooling protocols polycarbonate requires
Edge finishing — flame polishing, machine polishing, diamond-tool finishing for clear-edge applications
Annealing — controlled stress relief to prevent cracking after machining
Cut-to-size — sheet stock cut to your dimensions for fabrication-in-house customers
Custom prototypes through repeat production runs

On polycarbonate machining: Polycarbonate is gummy under heat. Without correct feeds, speeds, tool geometry, and cooling, you get melted edges, internal stress, and cracked parts. We’ve built polycarbonate fabrication protocols around these realities — sharp tooling, controlled chip evacuation, light passes, and post-machining annealing where the application demands it.

Common Polycarbonate Applications

Polycarbonate shows up across the OEM spectrum. These are the applications we fabricate most often.

Machine guards and safety shields — for industrial equipment, robotics cells, and automated lines
Viewing windows and inspection ports — on industrial enclosures, switchgear cabinets, and process equipment
Medical equipment housings and covers — FDA-compliant grades for direct fluid contact
Battery and electronics enclosures — flame-retardant grades for EV and power electronics
Transit glazing — UV-stabilized grades for buses, light rail, and specialty vehicles
Protective shields — face shields, lab equipment shields, and operator protection
Skylights and structural glazing — clear and tinted grades
Bullet-resistant components — security barriers and protective transit components
Structural covers and panels — clear access covers for equipment that needs visual inspection

Polycarbonate vs Acrylic: How to Choose

Polycarbonate and acrylic are often considered interchangeable. They aren’t. The wrong material in the wrong application gets you a part that cracks, scratches, or deforms in service. Here’s the short version:

Property	Polycarbonate	Acrylic (PMMA)	Glass
Impact strength	Highest — ~250× glass	Low — brittle	Lowest — shatters
Optical clarity	88–90% transmission	92% — slightly clearer	~90%
Service temperature	Up to 240°F	Up to ~180°F	Very high
UV resistance (uncoated)	Moderate — coating recommended	Excellent	Excellent
Scratch resistance (uncoated)	Lower — coating recommended	Higher	Highest
Weight vs glass	~50% lighter	~50% lighter	Baseline
Machinability	Good — gummy, needs heat control	Good — brittle, needs sharp tools	Difficult
Best when	Impact and toughness matter	Optics and finished edges matter	Pure clarity, no impact risk

Choose polycarbonate when…

Impact resistance is the primary requirement (machine guards, safety shields, viewing windows)
The part will see operating temperatures above ~180°F
UL flame ratings are required (FR grades available)
FDA compliance is needed for medical or food-contact use

Choose acrylic when…

Optical clarity matters more than impact resistance (lenses, displays)
The part needs polished, finished edges
Long-term outdoor UV exposure is the primary concern
Cost is the deciding factor and impact resistance isn’t critical

Need help deciding? [See our Acrylic Fabrication page →] or send us your application — we’ll recommend the right material before we quote.

Industries We Serve with Polycarbonate

Industry	Application
Aerospace	protective covers, viewing windows, structural shields
Electric Vehicles	battery enclosures, structural covers, viewing access
Medical	FDA-compliant equipment housings, fluid-contact covers, sterilizable components
Motor Applications	guards, viewing windows, structural protection
Power Electronics	flame-retardant enclosures, viewing ports, control covers
Switchgear	clear cabinet windows, flame-retardant access panels, inspection ports

Why OEMs Choose WMF McGraw for Polycarbonate

Engineered fabrication, not online instant quotes

Polycarbonate is unforgiving when machined wrong. We’ve been fabricating engineered plastics for OEMs for decades — every job is run with the right tooling, feeds, and post-machining stress relief, not pushed through a generic instant-quote queue.

All grades, in one place

Clear, FDA, flame-retardant, glass-fiber, UV-stabilized, abrasion-resistant — we fabricate the full grade range. You don’t have to specify around what we have on the shelf; you specify what your application actually needs.

Prototype through production

One-off prototype, low-volume run, or recurring production — we support all three. Many of our OEM customers start with a prototype and scale into ongoing supply with us.

In-house, under one roof

CNC machining, cutting, drilling, routing, and finishing all happen at our Riverview, Michigan facility. We control quality, lead time, and tolerance ourselves.

Frequently Asked Questions

What’s the maximum thickness of polycarbonate sheet you can fabricate?

We fabricate polycarbonate from thin sheet through thick block stock. Specific thickness ranges depend on the grade and the operation; contact us with your spec and we’ll confirm what we can handle in-house.

Can you fabricate FDA-compliant polycarbonate?

Yes. We work with FDA-compliant polycarbonate grades for medical and food-contact applications. Tell us the application and we’ll match the right grade and certification.

How does polycarbonate compare to acrylic?

Polycarbonate is roughly 30 times more impact-resistant than acrylic and handles higher temperatures, but acrylic is harder, more scratch-resistant, more UV-stable, and easier to polish to a finished edge. Choose polycarbonate when impact and toughness drive the spec; choose acrylic when optical clarity, polished edges, or outdoor weatherability drive it. See the comparison table above for full details.

What’s the temperature range for polycarbonate?

Continuous service temperature for general-purpose polycarbonate is approximately -40°F to 240°F. Heat deflection temperature is 270–290°F at 264 psi. Above ~297°F (the glass transition temperature), the material softens. For higher-temperature applications, consider a thermoset like G-10 or G-11.

Is polycarbonate UV resistant?

General-purpose polycarbonate has moderate UV resistance and will yellow over extended outdoor exposure. UV-stabilized grades are engineered to resist yellowing and embrittlement and are the right choice for outdoor service or sustained sunlight exposure.

Can polycarbonate be flame-retardant?

Yes. We fabricate flame-retardant polycarbonate grades meeting UL 94 V-0 and V-2 ratings, used in electrical enclosures, transit components, and other regulated applications.

Do you machine to drawings or only cut to size?

Both. We cut sheet to size for simple jobs and CNC-machine, drill, tap, and route to drawings for parts with critical tolerances or complex geometry.

How do I get a quote?

Send your drawing, specs, or a description of the application using the [Contact Us] form, email sales@wmfmcgraw.com, or call 734-281-1959. Most quotes turn around in one to two business days.