PMMA

📄Related standards (ISO, ASTM, JIS)

Standards that define the material or stock shapes. Standard texts are paid, so only titles and scopes checked on public pages are shown.

All ASTM standards on Kezuriba: ASTM standards quick reference.

🏷Common trade names (makers)

Plastics are often called by a maker’s product name. Names are trademarks of their owners.

• Acrylite (L, S, EX, etc.) (Mitsubishi Chemical)Registered trademark of Mitsubishi Chemical (as stated in the datasheet). L and EX are continuous cast; S is glass cell cast^[8][13][14]
• PLEXIGLAS (GS = cast, XT = extruded) (Röhm)Registered trademark of Röhm GmbH (as stated in the technical document). ACRYLITE in the US is a different trademark and is not the same as Mitsubishi Chemical's Japanese "Acrylite", so do not confuse them^[5]

🔧Machinability notes (as stated in the sources)

• Mitsubishi Chemical (Acrylite technical document, machining volume): Can be machined like wood or metal. Thermal conductivity is low, so frictional heat builds up on the machined surface and causes thermal strain and burning; keep heat generation down. Cooling with a compressed-air blast or a water-soluble cutting oil containing a rust inhibitor is effective. Sharp tools are important: rake angle from 0° to slightly negative, and ample clearance angle. Adjust feed and rotation so that smooth, glossy chips come off^[9]
• Mitsubishi Chemical drilling: Heat makes the material stick and roughens the hole surface. Control the feed by hand and withdraw the drill from time to time to clear chips. Grind a more obtuse point angle and a larger clearance angle than for metal. Using cutting oil or soapy water gives a clean hole with no residual strain. A high-helix drill for light metals is suitable. Guidelines: 2 mm diameter at 2,000–4,000 rpm, 6 mm at 1,000–2,000 rpm, 13 mm at 500–1,000 rpm, feed 60–300 mm/min. Reduce the feed just before breakthrough or use a backing plate to prevent chipping^[10]
• Mitsubishi Chemical threading, milling and turning: For threads, use a round-root Whitworth form with coarse pitch to avoid cracks at the thread root, cool with cutting oil or soapy water, and back the tap out from time to time. Milling: multi-flute cutter with 0° rake and 15–20° clearance, cutting speed 650–850 m/min, feed 70–90 mm/min, depth of cut 0.1–0.18 mm or less. Lathe: surface speed 100–300 m/min (standard 150), feed 0.1–0.15 mm/rev kept constant (stopping leaves marks). Roughing depth of cut up to about 1 mm. Set the tool slightly below center, and use air to clear chips and cool. Tool material: SKH (JIS high-speed steel)^[10]
• Annealing (stress relief): Mitsubishi Chemical recommends 70–80°C (80°C maximum), held 3 hours or more after reaching the target temperature. Raise the temperature slowly in steps and cool slowly, with cooling time of at least sheet thickness (mm) × 5 minutes. Residual strain makes chemical cracking more likely. If engraving causes burning, heat treat at 80°C for 2–3 hours or more before inking^[11][10]
• Röhm: Distinguishes cast sheet (GS) as "very easy to machine, about like hardwood" from extruded sheet (XT) as "easy to machine". The maximum continuous use temperature also differs: 80°C for cast and 70°C for extruded^[5]