Röhm Plexiglas® GS 249 Cast Acrylic

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Röhm Plexiglas® GS 249 Cast Acrylic (discontinued **)
Categories:	Polymer; Thermoplastic; Acrylic (PMMA); Acrylic, Cast
Material Notes:	Description: PLEXIGLAS® GS 249 is another cast acrylic specially developed to meet even higher demands by the aviation industry, but is additionally crosslinked. As compared with uncrosslinked acrylic, it offers higher resistance to media that cause stress cracking and increased heat distortion resistance. PLEXIGLAS® GS 249 is also excellently suited for stretching, which makes it possible to improve its properties even further over the unstretched state. Typical applications are cabin windows in civilian aircraft, glazing for pressurized aircraft cabins, cockpit glazing, canopies and windshields. 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
Water Absorption	0.20 %	0.20 %	MIL-P-8184
Water Absorption at Saturation	2.1 %	2.1 %	MIL-P-8184

Mechanical Properties	Metric	English	Comments
Tensile Strength at Break	80.0 MPa	11600 psi	ISO 527-2/1B/5, ASTM D638
Elongation at Break	5.0 %	5.0 %	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	113 °C	235 °F	ISO 71-2Ae, ASTM D648
Vicat Softening Point	118 °C	244 °F	ISO 306-B-50
Flame Spread	15.2 mm/min	0.600 in/min	Fire Rating; ASTM D635
	20.0 mm/min	0.787 in/min	Fire Rating; EN 3844-2

Optical Properties	Metric	English	Comments
Refractive Index	1.49	1.49	ISO 489, ASTM D542
Haze	1.5 %	1.5 %	Original State; EN 2155-9, ASTM D1003
	2.2 %	2.2 %	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
Angular 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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