PMMA Evonik PLEXIGLAS® 8N
PMMA Evonik PLEXIGLAS® 8N
PMMA Evonik (Degussa) 8N is general‑purpose injection & extrusion grade polymethyl methacrylate. It stands out for outstanding optical performance, good heat resistance, excellent chemical stability, superior weather resistance and mechanical strength。
Main Applications
Automotive: automotive lamp assemblies (taillights, signal lamps), instrument panels.
Optical components: lenses, light guides, optical lenses, protective covers.
Lighting: lamp housings, covers, light diffusers, especially for LED‑diffuser applications.
Electrical & electronics: transparent insulating parts, transparent keys, display components.
Consumer goods: stationery, tool‑box housings, showcase panels, sun‑lenses.
Sheets & profiles: extruded PMMA sheets, pipes and rods.
Properties
| Property Category | Item | Test Standard | Value | Unit |
|---|---|---|---|---|
| Physical | Density | ISO 1183 | 1.19 | g/cm³ |
| Water absorption (24 h) | ISO 62 / DIN 53495 | 0.3 | % | |
| MVR (230℃/3.8 kg) | ISO 1133 | 3.0 | cm³/10min | |
| MFR (230℃/3.8 kg) | ISO 1133 | 1.9‑3.0 | g/10min | |
| Molding shrinkage (flow) | ASTM D955 | 0.3‑0.6 | % | |
| Optical | Light transmittance (3 mm) | ISO 13468‑2 | 92 | % |
| Haze | ASTM D1003 | ＜0.5 | % | |
| Refractive index | ISO 489 | 1.49 | — | |
| Mechanical | Tensile modulus | ISO 527‑2/1 | 3300 | MPa |
| Tensile strength (break) | ISO 527‑2/5 | 73‑78 | MPa | |
| Tensile strain (break) | ISO 527‑2/5 | 5.5‑6.5 | % | |
| Flexural modulus | ISO 178 | 3300 | MPa | |
| Charpy un‑notched impact (23℃) | ISO 179/1eU | 15‑20 | kJ/m² | |
| Charpy notched impact (23℃) | ISO 179/1eA | 2.0 | kJ/m² | |
| Ball indentation hardness | ISO 2039 | 148 | MPa | |
| Rockwell hardness‑M | ASTM D785 | ~M95 | — | |
| Thermal | HDT 1.8 MPa (un‑annealed) | ISO 75‑2/Af | 95‑98 | ℃ |
| HDT 0.45 MPa (un‑annealed) | ISO 75‑2/Bf | 100‑105 | ℃ | |
| Vicat B50 | ISO 306 | 103‑108 | ℃ | |
| CLTE (flow) | DIN 53752A | 7.0‑8.0×10⁻⁵ | 1/K | |
| Electrical | Volume resistivity | IEC 60093 | ＞10¹⁵ | Ω·cm |
| Flammability | UL94 (1.5 mm) | UL94 | HB | class |
| DIN 4102 | DIN 4102 | B2 | class |
Processing Parameters
| Process | Item | Recommendation | Notes |
|---|---|---|---|
| Predrying | Drying temperature | 95‑100 ℃ | Desiccant dryer required; PMMA is highly hygroscopic |
| Drying time | ≥6 h | Moisture ＜0.1 %; bed thickness ≤30 mm | |
| Injection | Rear barrel | 140‑160 ℃ | Avoid long residence time & over‑temperature to prevent degradation |
| Middle barrel | 215‑235 ℃ | ||
| Front barrel | 200‑230 ℃ | ||
| Melt temperature | 200‑260 ℃ | ||
| Mold temperature | 50‑80 ℃ | Adjust with wall‑thickness & gating | |
| Injection pressure | 80‑100 MPa | High viscosity, higher injection pressure needed | |
| Extrusion | Extruder temperature | 180‑220 ℃ | For sheets, profiles, rods |
Note: All data for reference only.
