Poly(methyl methacrylate) (PMMA), also known as acrylic or acrylic glass as well as by the trade names Plexiglas, Acrylite, Lucite, and Perspex among several others (see below), is a transparent thermoplastic often used in sheet form as a lightweight or shatter-resistant alternative to glass. The same material can be utilised as a casting resin, in inks and coatings, and has many other uses.
Although not a type of familiar silica-based glass, the substance, like many thermoplastics, is often technically classified as a type of glass (in that it is a non-crystalline vitreous substance) hence its occasional historic designation as acrylic "glass". Chemically, it is the synthetic polymer of methyl methacrylate. The material was developed in 1928 in several different laboratories by many chemists such as William Chalmers, Otto Röhm and Walter Bauer and was first brought to market in 1933 by the Rohm and Haas Company under the trademark Plexiglas.
PMMA is an economical alternative to polycarbonate (PC) when extreme strength is not necessary. Additionally, PMMA does not contain the potentially harmful bisphenol-A subunits found in polycarbonate. It is often preferred because of its moderate properties, easy handling and processing, and low cost. Non-modified PMMA behaves in a brittle manner when under load, especially under an impact force, and is more prone to scratching than conventional inorganic glass, but modified PMMA is sometimes able to achieve high scratch and impact resistance.
PMMA can refer to
There's a place in my heart where you used to be
There's a pain, deep inside, don't want the world to see
Nothing, but emptiness, once there was your caress
I was touched by your naked flame
Now, it was hard sometimes, those things that we went through
But believe me when I'd say, I would never mean to hurt you
I hold the memory of holding you next to me
In my arms like a naked flame
Think it over before you break my heart
Think it over before the crying starts
Then we can say goodbye to the tears
I should have known that this time was a coming
But if you ever need me, I'll come a running home to you
There's a place in my dreams where we used to meet
But there's no one around now, it's just an empty street
I hold the memory of holding you close to me
In my arms, like a naked flame