Röhm Plexiglas® GS 245 Cast Acrylic

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Röhm Plexiglas® GS 245 Cast Acrylic (discontinued **)
Categories:	Polymer; Thermoplastic; Acrylic (PMMA); Acrylic, Cast
Material Notes:	Description: PLEXIGLAS® GS 245 is a cast acrylic with weather resistance specially developed to meet the high optical requirements of the aviation industry. The material is UV-absorbing and can be supplied in both clear-transparent and transparent colored grades. Typical applications are helicopter canopies, glider canopies, sports plane glazing and ultralights. Information provided by degussa. The former Evonik Methacrylates business has been sold to Röhm GmbH (Roehm).
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Physical Properties	Metric	English	Comments

Density	1.19 g/cc	0.0430 lb/in³	ISO 1183, ASTM D792

Mechanical Properties	Metric	English	Comments
Tensile Strength at Break	80.0 MPa	11600 psi	ISO 527-2/1B/5, ASTM D638
Elongation at Break	5.5 %	5.5 %	ISO 527-2/1B/5, ASTM D 638

Thermal Properties	Metric	English	Comments
CTE, linear	70.0 µm/m-°C @Temperature 20.0 °C	38.9 µin/in-°F @Temperature 68.0 °F	EN 2155-12, ASTM D696
Maximum Service Temperature, Air	105 °C	221 °F	ISO 71-2Ae, ASTM D648
Vicat Softening Point	115 °C	239 °F	ISO 306-B-50
Flame Spread	35.6 mm/min	1.40 in/min	Fire Rating; ASTM D635
	36.0 mm/min	1.42 in/min	Fire Rating; EN 3844-2
Shrinkage	1.5 % @Thickness 6.35 mm, Temperature 160 °C	1.5 % @Thickness 0.250 in, Temperature 320 °F	16 min

Optical Properties	Metric	English	Comments
Refractive Index	1.49	1.49	ISO 489, ASTM D542
Haze	0.50 %	0.50 %	Original State; EN 2155-9, ASTM D1003
	1.0 %	1.0 %	after artificial weathering; EN 2155-9, ASTM D1003
Transmission, Visible	89 %	89 %	after artificial weathering; ASTM D1003
	91 %	91 %	Original State; EN 2155-5, ASTM D1003
UV Transmittance	<= 1.0 % @Wavelength 290 - 330 nm	<= 1.0 % @Wavelength 290 - 330 nm

Descriptive Properties
Optical Deviation	Max 4 minutes		EN 2155-7 (ASTM D637)

**
Materials flagged as discontinued () are no longer part of the manufacturer’s standard product line according to our latest information. These materials may be available by special order, in distribution inventory, or reinstated as an active product. Data sheets from materials that are no longer available remain in MatWeb to assist users in finding replacement materials.

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