Choosing PC is rarely simple. Teams must pick the right grade, confirm drying and processing needs, check chemical and UV exposure, and balance performance against cost. The label "polycarbonate" tells you very little on its own.
This guide covers PC chemistry, properties, grades, blends, processing, applications, alternatives and sourcing, written for product and manufacturing teams in India.
Key Takeaways
- PC performance depends on the exact grade, blend, reinforcement and additive package.
- Core strengths: impact resistance, clarity, heat resistance, and light weight.
- Verify scratch resistance, UV stability, chemical compatibility and moisture sensitivity before selecting.
- Qualify grades through datasheets, testing and supply reliability, not the generic name.
What Is Polycarbonate (PC) Material?
Chemical identity and classification
PC is an amorphous thermoplastic whose polymer chain is linked by carbonate groups. The amorphous structure supports transparency, and the chain gives toughness while still allowing melt processing.
Conventional industrial PC uses bisphenol A (BPA). Two common routes exist:
- BPA with phosgene (interfacial polymerisation)
- BPA with diphenyl carbonate (melt transesterification)
Asahi Kasei describes a non-phosgene route, but non-phosgene does not mean BPA-free. BPA-free options exist, such as Mitsubishi Chemical's isosorbide-based DURABIO.
Is PC a polyester? It is technically an ester of carbonic acid, but it is not PET. PET is built from ethylene glycol and terephthalic acid, which gives different carboxylic ester chemistry.
How PC is manufactured and supplied
Polymerisation produces the resin, which is then converted into pellets, sheet, film or extruded rod. Because PC is thermoplastic, it can be reheated and reshaped. Excess heat history, contamination or moisture will damage final part quality.
Commercial grades and formulation differences
Different grades come from changes in:
- Molecular weight
- Additives and colourants
- Glass reinforcement
- Flame-retardant packages
- UV stabilisers
No single property profile covers every PC. Always read the datasheet of the specific grade.
Polycarbonate Material Properties, Advantages and Limitations
Mechanical performance
Terms get misused, so separate them:
- Strength: stress at yield or failure
- Stiffness: resistance to elastic deformation (modulus)
- Toughness: energy absorbed before fracture
- Hardness: resistance to local indentation
PC is prized mainly for toughness. Representative values for Covestro's Makrolon 2405 RE (a general-purpose grade) show how this looks in practice:
| Property | Value | Test condition |
|---|---|---|
| Density | 1.20 g/cm³ | ISO 1183-1 |
| Notched Izod impact | 65 kJ/m² at 23 °C; 15 kJ/m² at -30 °C | 3 mm, ISO 180/A basis |
| Tensile modulus / yield stress | 2400 / 65 MPa | ISO 527-1/-2 |
| Flexural modulus | 2350 MPa | ISO 178 |
These are one grade's values, not universal limits.
Thermal, optical and electrical performance
For the same grade, glass transition is 144 °C. Heat deflection temperature is 124 °C at 1.80 MPa and 137 °C at 0.45 MPa (ISO 75). Linear thermal expansion is 65 x 10⁻⁶/K.
Luminous transmittance reaches 89% at 2 mm (ISO 13468-2), though colour, finish, thickness and additives all change appearance.
Electric strength is 34 kV/mm at 1 mm (IEC 60243-1). For flame retardancy, Makrolon 6555 carries UL 94 V-0 at 3.0 mm but only V-2 at 1.0 mm. Always cite the grade and tested thickness.
Chemical and environmental resistance
Covestro's chemical resistance guide documents several vulnerabilities:
- Aromatic and halogenated solvents cause swelling or dissolution
- Alkalis and hot water hydrolyse carbonate bonds, faster at higher temperature
- Stress cracking depends on chemical exposure plus tensile stress
- Cleaners with amines, ammonia or solvents behave differently from mild soap solutions
Test with your actual chemical, concentration, temperature and exposure time. For outdoor use, SABIC documents UV and scratch-protective coatings on PC automotive glazing. Uncoated PC needs protection or a UV-stabilised grade.
Limitations and sustainability
Trade-offs are real:
- Processing sensitivity
- Scratching
- Moisture-related defects
- Grade-to-grade variation
Cost can also exceed general-purpose plastics.
On sustainability, PC falls under resin code 7 (OTHER), which does not guarantee collection or recycling. Covestro's Makrolon RV family offers up to 50% post-consumer recycled content, and its RE series uses mass-balance attribution of bio-waste feedstock.
Recycled-content and mass-balance claims are different things. Label each separately and check them against Indian collection infrastructure.
PC Grades, Blends and Processing Considerations
Grade selection
Common families include:
- General-purpose (Makrolon 2405 RE)
- Optical and automotive lens (LEXAN LS1)
- Flame-retardant (Makrolon 6555)
- Glass-filled (Makrolon 8035: 1.42 g/cm³, 30% glass fibre, 5100 MPa tensile modulus)
- High-heat medical copolycarbonate (Apec 1745)
Density therefore moves with reinforcement. To evaluate a grade, compare melt flow (Makrolon 2405 RE: MVR 19 cm³/10 min at 300 °C/1.2 kg), mechanical and thermal data, clarity or colour needs, regulatory documents and your processing method.
Lotte Chemical's INFINO range covers transparent PC, high-impact PC/GF, flame-retardant PC and alloys, and metal-plating PC alloys. Request full datasheets for numeric thermal and chemical limits.
PC blends and PC-TPU
PC and TPU are different polymer families. "PC and TPU material" may mean a blend, a layered construction or a comparison between the two. Covestro's Texin 575D is a documented PC/TPU blend (polyester-based polyurethane with PC) for automotive cladding, fascia and bumpers.
Other blends:
- PC/ABS: ABS processability with PC heat and impact performance (Trinseo)
- PC/ASA: SABIC GELOY XP4034 for automotive exteriors with high heat and toughness
Verify compatibility, processing conditions and end-use performance for the exact formulation.
Processing and handling
PC can be injection moulded, extruded, thermoformed, blow moulded, machined or 3D printed (Stratasys offers PC FDM filament). Moisture is the main hazard. Covestro's drying guide links it to splay, bubbles and hydrolytic chain degradation.
For Makrolon 2405 RE, the supplier specifies:
- Dry air at 120 °C for 2-3 hours, moisture at or below 0.02%
- Melt temperature 300 °C
- Mould temperature 80-120 °C
- Shrinkage 0.65% parallel, 0.70% normal
Follow your resin supplier's drying, storage and regrind instructions rather than generic settings.
Applications and Alternatives to PC Material
Where PC is commonly used
| Application | Why PC |
|---|---|
| Automotive glazing, panoramic roofs | Impact resistance, lightweight |
| Lighting and lenses | Clarity, heat performance |
| Medical devices | Sterilisation-compatible portfolios |
| Electronics housings | Electrical insulation, flame-retardant options |
| Machine guards, face shields | Transparent toughness |
| Appliances | PC/ABS blends |
Applications identify candidates, not approvals. Medical grades may reference ISO 10993 and USP Class VI testing, but resin testing does not establish final-device biocompatibility.
Food contact is regulated too: 21 CFR 177.1580 in the US, Regulation (EU) 2024/3190 restricting BPA in the EU, and IS 14971:2001 in India.
How to decide whether PC is suitable
Work through these factors:
- Impact load and operating temperature
- Transparency and surface-finish expectations
- Chemical exposure and UV conditions
- Dimensional tolerance and manufacturing process
- Compliance needs and total landed cost
Then validate through application-specific trials, especially where failure affects safety, patient use, electrical performance or outdoor durability.
Alternatives and comparisons
| Alternative | Qualitative comparison |
|---|---|
| ABS | Lighter (Terluran GP-22: 1.04 g/cm³), easier to process; lower heat capability |
| PMMA | Better clarity and weatherability; PC is tougher with higher heat capability |
| TPU | Flexible, abrasion-resistant; not a rigid-PC substitute |
| Glass | PC has about half the density; coating needed for scratch and weathering |
A blend such as PC/ABS may balance cost and processability better than unmodified PC.
How to Select and Source PC Material
Procurement and technical qualification checklist
Request for the intended grade:
- Technical datasheet, SDS and processing guidance
- Lot-specific certificate of analysis
- RoHS/REACH and food-contact declarations where relevant
- Colour or optical specifications and packaging details
Also assess:
- Batch-to-batch consistency and traceability
- Lead times and minimum order quantities
- Storage conditions
- Alternate-grade availability for scale-up One regulatory note: India's Polycarbonate Quality Control Order was rescinded on 12 November 2025, so confirm current requirements with your supplier.
Application validation and scale-up
Move in stages:
- Material screening
- Lab trials
- Pilot production
- Mould or process validation
- Performance testing
- Commercial approval
Choose tests to match the application:
- Impact: ISO 179 / ISO 180
- Tensile: ISO 527
- Heat: ISO 75 (HDT), ISO 306 (Vicat)
- Weathering: ISO 4892-2
- Optical: ASTM D1003
Set pass criteria with your own end-use requirements, not universal numbers.
Where Distil fits
Distil supplies polycarbonate and PC alloys as branded and custom grades to plastics processors and OEMs, with material-selection support across stocked and application-matched options. Buyers can align grade choice with end-use needs and plan scale-up around lead times and supply continuity.
Discuss your specific PC requirements with the team directly.
Frequently Asked Questions
What is PC material?
PC is an amorphous thermoplastic with carbonate linkages. It is valued for impact resistance, heat performance, optical clarity and broad processability.
What is PC and TPU material?
PC and TPU are distinct polymers. The phrase may describe a blend (such as Texin 575D), a layered construction or a comparison, and the exact formulation determines performance.
Is PC a polyester?
It is a carbonic-acid ester polymer, so some sources group it with thermoplastic polyesters. Its carbonate linkages differ from PET's terephthalate ester chemistry.
What is the density of PC material?
It varies by grade. Makrolon 2405 RE and the flame-retardant 6555 are 1.20 g/cm³; the 30% glass-filled 8035 is 1.42 g/cm³. Check your grade's datasheet.
Is PC material strong?
Strength, stiffness and toughness differ. PC is known for high impact toughness and good mechanical performance, but grade-specific and application-specific testing is still required.
