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PMMA
Material Type
General Plastics
Material Full Name
Poly(methyl methacrylate
Process Compatibility
Injection Molding, CNC Machining
Basic Properties
Property |
Parameter/Performance |
Remarks |
|---|---|---|
| Chemical Name | Polymethyl Methacrylate | Commonly known as “acrylic glass” or “plexiglass” |
| Molecular Structure | Amorphous linear polymer | Superior transparency compared to standard glass |
| Density | 1.17~1.20 g/cm³ | Approximately half the weight of glass |
| Transparency | 92% light transmittance (3mm thickness) | UV transmittance >75% (can add UV absorbers) |
| Mechanical Properties | ||
| – Tensile Strength | 55-75 MPa | Noticeably brittle (elongation at break only 2-6%) |
| – Impact Strength | 1.5-2.5 kJ/m² (notched Izod) | Can be improved through copolymerization |
| Thermal Properties | ||
| – HDT (1.82MPa) | 85-105℃ | Heat-resistant grades up to 115℃ |
| – Service Temperature | -40℃~90℃ | Begins softening above 100℃ |
| Flammability | UL94 HB (flammable) | Can reach V2 rating with flame retardants |
| Electrical Properties | ||
| – Dielectric Strength | 15-20 kV/mm | Excellent high-frequency insulation material |
Processing Characteristics
Thermal Stability:
- Processing range: 180-250℃ (decomposes above 270℃)
- Requires thorough drying (0.3% water absorption, 80℃ for 4 hours)
Flowability:
- Melt flow index: 5-20g/10min (230℃/3.8kg)
Primary Processing Methods:
- Injection molding (high speed/pressure for thin walls)
- Extrusion (sheets/rods)
- Casting (thick parts or complex shapes)
Common Application Areas
-
Optics: Automotive lenses, optical fibers
-
Displays: LED light guides, VR lenses
-
Architecture: Soundproof glass, skylights
ABS Modified Types
Type |
Characteristics |
Typical Applications |
|---|---|---|
| Cast PMMA | High MW (>1 million), crack-resistant | Bathtubs, large signage |
| Extruded PMMA | Lower MW (200-500k), easy processing | Light boxes, display light guides |
| Impact-Modified PMMA | Added elastomers (e.g., MBS), 3-5x impact resistance | Automotive taillight covers, instrument panels |
| Anti-Glare PMMA | Micro-textured surface (Ra 0.2-1.0μm) | Touchscreens, instrument panels |
| Medical-Grade PMMA | Ultra-pure, biocompatible | Intraocular lenses, dental materials |
Advantages & Disadvantages
Advantages |
Disadvantages |
|---|---|
| Best optical properties (>92% transmittance) | Low surface hardness (Mohs 2-3) |
| Excellent weatherability (10+ years outdoor) | Poor solvent resistance (soluble in acetone/chloroform) |
| Good processability | Higher cost than PS/PC (~2-3x) |
Other General Plastics Selection
PP Materials
PE Materials
ABS Materials
PVC Materials
PS Materials
FAQ Of PMMA Materials
Visit our FAQ center for more questions.
What are the advantages of PMMA plastic compared to ordinary glass?
PMMA is lighter (density ~1.18 g/cm³), more impact-resistant (less prone to shattering), and has higher light transmittance (over 92%). It is also easier to process and mold, making it a suitable replacement for glass in applications like signage, lighting fixtures, and protective covers.
What is the heat resistance of PMMA plastic?
PMMA can withstand continuous use at temperatures up to 80°C (176°F) and short-term exposure to 100°C (212°F). However, prolonged exposure to higher temperatures may cause deformation, so it is not recommended for high-temperature environments.
Is PMMA plastic prone to scratching? How should it be cleaned and maintained?
PMMA has a relatively low surface hardness (Mohs hardness ~2-3) and can be easily scratched by sharp objects. For cleaning, use a soft cloth with mild detergent, and avoid alcohol or abrasive cleaners. Store away from sharp objects to prevent surface damage.