PMMA (Polymethyl Methacrylate) Material Guide
Overview
PMMA (Polymethyl Methacrylate) is a transparent engineering thermoplastic widely recognized for its exceptional optical clarity, UV resistance, weatherability, surface hardness, and lightweight properties.
PMMA is commonly referred to as Acrylic, and is sold under well-known commercial brands such as Plexiglas®, Acrylite®, Lucite®, and Perspex®. It is often used as a high-performance alternative to glass due to its superior light transmission, lighter weight, and ease of fabrication.
PMMA is widely used in:
- Optical Lenses
- Signage and Displays
- Medical Equipment
- Automotive Lighting
- Architectural Glazing
- LED Light Guides
- Protective Covers
- Consumer Products
With light transmission reaching 92%, PMMA offers the highest optical clarity among commercially available transparent plastics.
Material Specification
| Property | Value |
|---|---|
| Material Designation | PMMA |
| Full Name | Polymethyl Methacrylate |
| Common Name | Acrylic |
| Material Family | Transparent Engineering Thermoplastic |
| Density | 1.17–1.20 g/cm³ |
| Transparency | Excellent |
| Light Transmission | 91–92% |
| Typical Manufacturing Methods | CNC Machining, Injection Molding, Extrusion, Thermoforming |
| Standard Forms | Sheet, Rod, Tube, Film, Pellets |
Chemical Composition
PMMA is produced through polymerization of methyl methacrylate monomers.
| Component | Function |
|---|---|
| PMMA Polymer | Structural Matrix |
| UV Stabilizers | Weather Resistance |
| Processing Additives | Manufacturing Performance |
| Colorants (Optional) | Appearance Enhancement |
PMMA naturally possesses excellent UV stability without requiring significant additive packages.
Mechanical Properties
Typical Values
| Property | Value |
|---|---|
| Tensile Strength | 60–75 MPa |
| Yield Strength | 55–70 MPa |
| Elongation at Break | 2–10% |
| Flexural Strength | 90–120 MPa |
| Flexural Modulus | 2.5–3.5 GPa |
| Hardness | Rockwell M90–105 |
| Compressive Strength | 100–130 MPa |
Typical Mechanical Performance
| Property | Performance |
|---|---|
| Rigidity | Excellent |
| Surface Hardness | Excellent |
| Dimensional Stability | Excellent |
| Impact Resistance | Moderate |
PMMA offers excellent rigidity and scratch resistance but is less impact resistant than Polycarbonate.
Physical Properties
| Property | Value |
|---|---|
| Density | 1.17–1.20 g/cm³ |
| Water Absorption (24h) | 0.2–0.4% |
| Thermal Conductivity | 0.18–0.25 W/m·K |
| Electrical Resistivity | >10¹⁴ Ω·cm |
| Refractive Index | 1.49 |
| Specific Heat Capacity | 1460 J/kg·K |
Optical Properties
| Property | Value |
|---|---|
| Light Transmission | 91–92% |
| Transparency | Outstanding |
| Optical Clarity | Outstanding |
| Haze | Very Low |
| Gloss | High |
PMMA transmits more visible light than standard glass and most engineering plastics.
Thermal Properties
| Property | Value |
|---|---|
| Glass Transition Temperature | 105°C |
| Heat Deflection Temperature | 85–100°C |
| Vicat Softening Temperature | 105–115°C |
| Continuous Service Temperature | -30°C to 80°C |
| Short-Term Service Temperature | Up to 95°C |
PMMA performs well in most indoor and outdoor environments but is not intended for high-temperature applications.
Strength-to-Weight Ratio
| Material | Density (g/cm³) | Tensile Strength |
|---|---|---|
| PMMA | 1.19 | 70 MPa |
| Polycarbonate | 1.20 | 70 MPa |
| PETG | 1.27 | 50 MPa |
| Glass | 2.50 | 40 MPa |
PMMA combines high transparency with lightweight performance.
UV Resistance
| Property | Performance |
|---|---|
| UV Stability | Outstanding |
| Weather Resistance | Outstanding |
| Yellowing Resistance | Excellent |
| Outdoor Durability | Excellent |
PMMA is one of the most UV-resistant transparent plastics available.
Chemical Resistance
| Chemical Environment | Performance |
|---|---|
| Water | Excellent |
| Dilute Acids | Good |
| Dilute Alkalis | Good |
| Oils & Greases | Good |
| Alcohols | Fair |
| Aromatic Solvents | Poor |
| Ketones | Poor |
Aggressive solvents may cause stress cracking or surface damage.
Electrical Properties
| Property | Value |
|---|---|
| Volume Resistivity | >10¹⁴ Ω·cm |
| Surface Resistivity | >10¹³ Ω |
| Dielectric Strength | 15–25 kV/mm |
| Dielectric Constant | 2.6–3.2 |
PMMA is widely used in electrical insulation and optical electronics applications.
Impact Resistance
| Property | Rating |
|---|---|
| Room Temperature Impact | Moderate |
| Low Temperature Impact | Fair |
| Drop Resistance | Moderate |
| Shatter Resistance | Better Than Glass |
PMMA is stronger than glass but significantly less impact resistant than Polycarbonate.
Machinability
| Process | Rating |
|---|---|
| CNC Milling | Excellent |
| CNC Turning | Excellent |
| Drilling | Excellent |
| Laser Cutting | Outstanding |
| Engraving | Outstanding |
Machinability Comparison
| Material | Machinability |
|---|---|
| PMMA | Outstanding |
| Polycarbonate | Good |
| ABS | Excellent |
| PETG | Good |
PMMA is one of the most popular materials for laser cutting and precision engraving.
Thermoforming Characteristics
| Property | Rating |
|---|---|
| Thermoformability | Excellent |
| Vacuum Forming | Excellent |
| Hot Bending | Excellent |
| Optical Quality Retention | Excellent |
PMMA is widely used for transparent formed products and display applications.
International Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ISO | PMMA |
| ASTM | Acrylic Resin |
| DIN | PMMA |
| JIS | PMMA |
| GB/T (China) | 聚甲基丙烯酸甲酯（PMMA） |
| UL | PMMA Thermoplastic |
Available Forms
| Product Type | Availability |
|---|---|
| Sheet | Yes |
| Rod | Yes |
| Tube | Yes |
| Film | Yes |
| Pellets | Yes |
| Injection Molded Parts | Yes |
Typical Applications
Signage & Advertising
- Illuminated Signs
- Display Panels
- Retail Displays
- Logo Lettering
Architecture & Construction
- Skylights
- Transparent Partitions
- Decorative Panels
- Building Facades
Automotive Industry
- Headlamp Lenses
- Light Covers
- Instrument Panels
- Interior Decorative Components
Medical Industry
- Diagnostic Equipment Covers
- Transparent Housings
- Laboratory Equipment Components
Lighting Industry
- LED Light Guides
- Diffusers
- Optical Lenses
- Lighting Covers
Consumer Products
- Aquariums
- Display Cases
- Furniture Components
- Decorative Products
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| CNC Machining | Outstanding |
| Laser Cutting | Outstanding |
| Injection Molding | Excellent |
| Thermoforming | Excellent |
| Vacuum Forming | Excellent |
Advantages
Exceptional Optical Clarity
Offers up to 92% light transmission.
Excellent UV Resistance
Maintains transparency and color stability outdoors.
Lightweight
Approximately 50% lighter than glass.
Superior Surface Hardness
More scratch resistant than Polycarbonate.
Easy Fabrication
Excellent for machining, laser cutting, and forming.
Outstanding Weather Resistance
Ideal for long-term outdoor applications.
Limitations
Lower Impact Resistance
Less durable than Polycarbonate under heavy impact.
Brittle Nature
Can crack under severe shock loading.
Moderate Heat Resistance
Not recommended for high-temperature environments.
Solvent Sensitivity
Certain solvents may cause cracking or crazing.
Comparison with Transparent Plastics
| Property | PMMA | Polycarbonate | PETG |
|---|---|---|---|
| Transparency | Outstanding | Excellent | Good |
| Impact Resistance | Moderate | Outstanding | Good |
| UV Resistance | Outstanding | Moderate | Good |
| Scratch Resistance | Better | Lower | Lower |
| Cost | Moderate | Higher | Moderate |
Comparison with Glass
| Property | PMMA | Glass |
|---|---|---|
| Density | 1.19 g/cm³ | 2.50 g/cm³ |
| Light Transmission | 92% | 88–90% |
| Weight | Light | Heavy |
| Impact Resistance | Better | Poor |
| Machinability | Excellent | Difficult |
Available Surface Finishes
Standard Finishes
- Gloss Clear Finish
- Matte Finish
- Frosted Finish
Functional Finishes
- CNC Machined Finish
- Flame Polished Finish
- Diamond Polished Finish
Specialty Finishes
- Anti-Glare Finish
- UV-Coated Finish
- Colored PMMA Finish
- Mirror PMMA Finish
Frequently Asked Questions (FAQ)
What is PMMA?
PMMA (Polymethyl Methacrylate) is a transparent engineering plastic commonly known as Acrylic.
What is PMMA used for?
Typical applications include:
- Signage
- Display Cases
- Optical Components
- Lighting Systems
- Architectural Panels
Is PMMA stronger than glass?
Yes. PMMA offers better impact resistance and significantly lower weight than glass.
Is PMMA better than Polycarbonate?
PMMA provides superior optical clarity and UV resistance, while Polycarbonate offers much higher impact resistance.
Can PMMA be machined?
Yes. PMMA offers excellent CNC machining, laser cutting, polishing, and thermoforming capabilities.
Why choose PMMA?
Because it combines:
- Outstanding Transparency
- Excellent UV Resistance
- Lightweight Construction
- Superior Surface Hardness
- Easy Fabrication
Is PMMA suitable for outdoor applications?
Yes. PMMA is one of the most weather-resistant transparent plastics available.
Does GCNOV provide PMMA manufacturing services?
Yes. GCNOV provides:
- PMMA CNC Machining
- Acrylic Laser Cutting
- Injection Molding
- Thermoforming
- Surface Polishing
- Prototype Development
- Low-Volume Production
- Mass Production