Polycarbonate Sheet, Rod & Tube — Lexan Material Guide

Polycarbonate (PC) is an amorphous thermoplastic that delivers 250 times the impact resistance of glass and 30 times that of acrylic while maintaining 88% optical light transmission. Sold under trade names Lexan, Makrolon, and Tuffak, it is the default choice when transparency and toughness must coexist — machine guards, security glazing, enclosures, and optical lenses all depend on it. Available in sheet, rod, and tube form in thicknesses from 0.020" to 1" and beyond.

At a glance:

• Impact resistance: 18 ft-lb/in notched Izod — essentially unbreakable at normal service loads
• Optical transmission: 88% (clear grades), comparable to glass at a fraction of the weight
• Continuous service temperature: 240°F (116°C); short-term peaks to 270°F
• UL 94 V-2 flame rating standard; V-0 grades available
• Hot-line bendable without an oven; thermoforms at 340–375°F
• Density 1.20 g/cc — roughly half the weight of aluminum
• FDA 21 CFR 177.1580 compliant grades available (see BPA note)

What Is Polycarbonate?

Polycarbonate is a linear carbonate-linked polymer (bisphenol-A based) that was commercialized in the late 1950s independently by Bayer (Makrolon) and GE Plastics (Lexan). The carbonate group in the backbone is responsible for both the material's toughness — chains absorb energy by rotating and deforming before fracturing — and its susceptibility to certain solvents and UV degradation without stabilizer additives.

The amorphous structure (no crystalline phase) gives PC its optical clarity and also explains its dimensional consistency across a wide temperature range. Unlike semi-crystalline plastics such as nylon or PEEK, PC does not shrink suddenly at a crystallization temperature; it softens gradually above its glass transition temperature of roughly 302°F (150°C).

Key Physical Characteristics

Density is 1.20 g/cc — lighter than glass (2.5 g/cc) and significantly lighter than aluminum (2.7 g/cc). A 4′×8′ sheet of 0.25" polycarbonate weighs approximately 26 lb, compared to 65 lb for equivalent-thickness glass. This weight advantage matters in overhead glazing, aircraft interiors, and portable machine guards.

The refractive index of 1.586 makes polycarbonate a common lens substrate for eyewear and optical instruments. That same index, combined with good melt flow characteristics, is why injection-molded PC lenses are cost-effective at scale.

Amorphous vs. Crystalline Structure

As an amorphous polymer, polycarbonate has no defined melting point — it softens over a range rather than transitioning sharply. The glass transition temperature (Tg) of ~302°F (150°C) is the practical upper limit for continuous structural load. Above Tg, PC loses stiffness rapidly but remains processable for forming operations.

Forms, Sizes, and Colors

Sheet

Polycarbonate sheet is the highest-volume form. Standard slab size is 48″ × 96″ (4′ × 8′), with 60″ × 96″ and 48″ × 120″ also common. Thickness range runs from 0.020" flexible film up through 0.500" and 1.000" structural plate. Masking film (paper or polyethylene) is applied to both surfaces at the mill to protect against handling scratches.

Available clear, bronze, smoke, white, black, and in a growing range of specialty tints. Clear achieves 88% light transmission; bronze and smoke reduce glare for architectural glazing while retaining high impact performance.

Rod and Tube

Polycarbonate rod ranges from 0.25" to 6" diameter; tube is available in standard wall thicknesses with ODs from 0.50" to 8". Rod and tube are used in optical components, sight glasses, stand-offs, rollers, and custom machined parts where the combination of clarity and toughness is required.

Specialty Sheet Formats

• Twinwall / multiwall sheet: hollow fluted construction for greenhouse glazing, skylights, and sign faces — lighter and with better thermal insulation than solid sheet
• Abrasion-resistant (AR) coated sheet: hard-coat on one or both faces per ANSI Z87.1 for machine guards and face shields
• Bulletproof laminate: multiple PC layers with polyurethane interlayers for UL 752 Level 1–8 ballistic ratings

Mechanical Properties

The notched Izod value of 18 ft-lb/in is one of the highest of any unfilled thermoplastic. The unnotched specimen typically shows no break — meaning the specimen bends rather than fractures. This is why polycarbonate is specified in safety glazing, riot shields, and machine guards where a fracture event is unacceptable.

For detailed property breakdowns including electrical, optical, and thermal data, see the polycarbonate properties page.

Grades and Trade Names

Four principal grades cover most industrial and commercial applications:

Makrolon (Covestro) and Lexan (SABIC) are interchangeable in most general-purpose applications. Tuffak is a Plaskolite brand that meets the same ASTM D3935 and ANSI Z26.1 standards. PC-GF30 is an engineering compound used where stiffness at elevated temperature matters more than optical clarity.

For a full breakdown including abrasion-resistant coatings and specialty compounds, see the polycarbonate grades guide.

Key Applications

Machine guards and safety glazing are the largest use category. OSHA 1910.212 requires point-of-operation guarding; polycarbonate satisfies this requirement while allowing operators to see the process. The material withstands incidental tool impacts that would shatter acrylic or tempered glass.

Architectural and security glazing includes bullet-resistant windows, bank teller barriers, and hurricane-rated panels. The ballistic resistance scales with thickness and laminate construction — a single 1" PC lite provides UL 752 Level 1 (9mm) protection; multi-lite laminates reach Level 8 (7.62mm armor-piercing).

Electronics enclosures leverage the UL 94 V-2 rating, dimensional stability, and ease of forming. PC is readily thermoformed into complex enclosure geometries and bonds well with adhesives.

Optical and lighting components use the refractive index, high transmission, and moldability. Headlamp lenses, light diffusers, and instrument covers are common molded or machined PC parts.

Lenses and face protection for personal protective equipment (PPE) require ANSI Z87.1 compliance — met by AR-coated Makrolon grades.

For application-specific details including load calculations for machine guards, see the polycarbonate applications guide.

Polycarbonate vs. Competing Transparent Plastics

When specifying a transparent structural plastic, three materials dominate the decision matrix:

The core trade-off: polycarbonate is tougher and higher-temperature than acrylic, but acrylics are stiffer per dollar, scratch-resistant without coating, and optically clearer. Choosing between them is covered in depth at acrylic vs. polycarbonate.

For comparisons against ABS and PETG, see the polycarbonate comparisons index.

Fabrication Overview

Polycarbonate processes well with standard woodworking and metalworking equipment, with a few key rules:

• Cutting: circular saw with fine-tooth carbide blade, or router — avoid high-speed with excessive heat buildup
• Drilling: sharp drill ground to a 60° included point angle (flatter than standard) prevents cracking at exit; back the workpiece
• Line bending: a strip heater softens a localized zone for 90° bends without an oven — minimum bend radius equals material thickness for clear grades
• Thermoforming: heat entire sheet to 340–375°F in a convection oven; pre-dry at 250°F for 4–6 hours to prevent bubble formation from moisture
• Bonding: methylene chloride (MeCl₂) solvent cement works on PC; avoid cyanoacrylates on stressed parts; two-part urethane for structural bonds
• Polishing: flame polishing does not work on PC (risk of crazing); use progressive wet-sanding to 2000 grit then buffing compound

Full tooling parameters are in the polycarbonate machining and fabrication guide.

FDA and Food-Contact Compliance

General-purpose polycarbonate is listed under FDA 21 CFR 177.1580 for repeated food-contact use. However, BPA (bisphenol-A) is an integral part of the polymer backbone — not a trace additive — and some jurisdictions restrict BPA-containing materials for direct food contact, particularly for bottles and containers with children's products. For food-zone conveyor components or packaging machinery, confirm the specific grade and end-use with your compliance team.

NSF International certifies specific PC grades for potable water contact (NSF/ANSI 61). Details are in the polycarbonate FDA and food-grade guide.

Specifications and Standards

Polycarbonate sheet and rod are produced to ASTM D3935 (sheet) and D5927 (rod). Machine-guard applications reference ANSI Z87.1 for eye/face protection and ANSI B11 machine-specific standards for point-of-operation guarding. UL 94 V-2 is the standard flame rating for general-purpose grades; V-0 specialty compounds exist for tighter flammability requirements. Bullet-resistant assemblies reference UL 752, which tests complete glazing units — not bare sheet — across eight levels from 9mm to 7.62mm armor-piercing. ANSI Z26.1 covers automotive safety glazing.

Detailed thickness tolerances, standard stock sizes, and UL/CSA listings are in the polycarbonate specifications page.

Frequently Asked Questions

Common questions from engineers and buyers: Will polycarbonate yellow outdoors? Can you bend it without cracking? Is it truly bullet-resistant? What forming temperature is needed? How should you clean installed panels without causing stress crazing? What are the correct fastener clearances to prevent cracking at mounting holes? Answers to these and more are in the polycarbonate FAQ.

Order Polycarbonate Sheet, Rod, or Tube

Federal Materials stocks Lexan, Makrolon, and Tuffak polycarbonate in standard and cut-to-size formats. Custom sheet cutting, rod blanks, and tube sections ship same day on most stock sizes. Contact us with thickness, width, length, and grade requirements for a fast quote.

Cross-material options: if impact is secondary and optical clarity or cost is primary, review acrylic / Plexiglas sheet as an alternative. For opaque structural enclosure applications without optical requirements, ABS sheet and rod may offer better chemical resistance and paintability. For food-processing machinery where chemical resistance is critical, PET and PETG sheet is worth evaluating.

More related guides

Cross-cluster suggestions to help shoppers and engineers explore adjacent topics:

Applications

• Machine Guards
• Marine Outdoor

Industries

• Marine

Compare to other materials

• Ultem Vs. Polycarbonate
• Polycarbonate Vs. Acrylic
• Polycarbonate Vs. Abs

Frequently asked questions — Polycarbonate FAQ