PMMA Shuangxiang SX‑304
PMMA Shuangxiang SX‑304
PMMA Shuangxiang SX‑304 is general‑purpose high‑transparency polymethyl methacrylate. It delivers good dimensional stability, excellent weather‑resistance, favorable mechanical strength and heat‑resistance.
Main Applications
Lighting: lamp covers, diffusion panels.
Automotive: typical for automotive taillight lenses.
Optical components: optical lenses.
Electrical & electronics: transparent insulating components.
Household articles: injection‑molded household products.
Extrusion profiles: sheets, tubes and rods.
Properties
表格
| Property Category | Item | Test Standard | Value | Unit |
|---|---|---|---|---|
| Physical | Density | ISO 1183 | 1.19 | g/cm³ |
| Water absorption (24 h) | ISO 62 | 0.3 | % | |
| MFR(230℃/3.8 kg) | ISO 1133 | 2.0 | g/10min | |
| Molding shrinkage | ISO 294‑4 | 0.2‑0.6 | % | |
| Refractive index | ISO 489 | 1.49 | — | |
| Light transmittance (3 mm) | ISO 13468‑1 | ＞93 | % | |
| Haze | ISO 14782 | 0.3 | % | |
| Mechanical | Tensile strength (break) | ISO 527‑2 | 76 | MPa |
| Elongation at break | ISO 527‑2 | 6 | % | |
| Flexural strength | ISO 178 | 140 | MPa | |
| Flexural modulus | ISO 178 | 3300 | MPa | |
| Charpy notched impact | JIS K‑7110 | 1.6 | kJ/m² | |
| Rockwell hardness‑M | ISO 2039‑2 | M101 | — | |
| Thermal | HDT (1.8 MPa) | ISO 75‑2 | 99 | ℃ |
| Vicat B50 | ISO 306 | 104 | ℃ | |
| Linear thermal expansion coefficient | ISO 11359‑2 | 7.0×10⁻⁵ | cm/cm/℃ | |
| Electrical | Volume resistivity | IEC 60093 | ＞10¹⁴ | Ω·cm |
| Surface resistivity | IEC 60093 | ＞10¹⁶ | Ω | |
| Dielectric strength | IEC 60243‑1 | 20 | kV/mm | |
| Dielectric constant (1 MHz) | IEC 60250 | 3.5 | — | |
| Flammability | UL94 (1.5 mm) | UL94 | HB | class |
Injection‑Molding Parameters
表格
| Process | Item | Recommendation | Notes |
|---|---|---|---|
| Predrying | Drying temperature | 80‑85 ℃ | Desiccant dryer required; target moisture＜0.1 % |
| Drying time | 4‑5 h | Avoid bubbles & silver‑streaks | |
| Barrel setting | Rear zone | 185‑205 ℃ | Melt onset ~160 ℃, decomposition＞270 ℃ |
| Middle zone | 220‑240 ℃ | ||
| Front zone | 210‑230 ℃ | ||
| Nozzle | 210‑230 ℃ | Normally 20 ℃ lower than max barrel temperature | |
| Melt temperature | 210‑230 ℃ | Avoid long residence time to prevent degradation | |
| Mold temperature | 40‑80 ℃ | Higher temp improves gloss yet lengthens cycle time | |
| Injection pressure | 80‑120 MPa | High viscosity, requires higher injection pressure; holding pressure 40‑60 MPa | |
| Injection speed | Medium | High speed causes surface defects & internal stress | |
| Back pressure | 0.5‑1.0 MPa | For melt homogenization | |
| Screw speed | 50‑70 rpm | Avoid excessive shear rate |
Note: All data for reference only, refer to official TDS for mass‑production.
