Search results
Results From The WOW.Com Content Network
PMMA ignites at 460 °C (860 °F) and burns, forming carbon dioxide, water, carbon monoxide, and low-molecular-weight compounds, including formaldehyde. [17] PMMA transmits up to 92% of visible light (3 mm (0.12 in) thickness), [18] and gives a reflection of about 4% from each of its surfaces due to its refractive index (1.4905 at 589.3 nm). [3]
For many applications it has since been replaced by other methods for making PMMA such as extrusion, which gives uniform surface features. However, for applications where strength is critical cell casting techniques are still employed in conjunction with stretching, which produces a stronger overall material.
converts from incident air kerma to MGD, with a glandularity of 50%, based on breast thickness and HVL. c {\displaystyle c} corrects for glandularity other than 50%, depending on the breast thickness and HVL, with two versions for ages 50–64 and 40–49.
The following other wikis use this file: Usage on ar.wikipedia.org بولي ميثيل ميثاكريلات; Usage on azb.wikipedia.org پولی (متیل متاکریلات)
PMMA is also known by trade names such as Lucite, Perspex and Plexiglas. It serves as a sturdy substitute for glass for items such as aquariums, buttons, motorcycle helmet visors, aircraft windows, viewing ports of submersibles, and lenses of exterior lights of automobiles.
PMMA may refer to: para-Methoxymethamphetamine, a stimulant drug; Philippine Merchant Marine Academy; Poly(methyl methacrylate), a transparent thermoplastic often ...
Dansyl chloride solution in a cuvette. In laboratories, a cuvette (French: cuvette, lit. 'little vessel') is a small tube-like container with straight sides and a circular or square cross-section.
Crazes (surface cracks) produced by ESC in PMMA drinking beaker. Environmental Stress Cracking (ESC) is one of the most common causes of unexpected brittle failure of thermoplastic (especially amorphous) polymers known at present. According to ASTM D883, stress cracking is defined as "an external or internal crack in a plastic caused by tensile ...