Commonly called

Organic glass, acrylic.

Scientific name

PMMA.

Colour

PMMA is a colorless transparent particle with a specific gravity of 1.19, heavier than water. The surface has a high gloss, and the product has characteristics of toughness, hardness, and rigidity.

Combustion characteristics

It is difficult to ignite and can continue to burn after leaving the fire. The lower end of the flame is blue, the upper end is yellow, and the top is white. When burning, it softens and bubbles, while emitting the smell of flowers and fruits rotting.

Advantages

1. The biggest advantage of PMMA is its optical performance. It is transparent, and unlike other transparent materials, it can pass through light that other transparent materials cannot. Light can also be transmitted inside and used as optical fibers.

2. It is resistant to outdoor aging and exposure to sunlight without affecting its transparency, which other transparent plastics do not possess.

3. It has unique electrical performance, and its power factor decreases with increasing frequency. Has good mechanical properties, resistance to dilute inorganic acids and bases, oil and grease, and good printing performance.

Disadvantages

The biggest drawback of PMMA is its low surface hardness and poor resistance to scratches.

Injection molding performance

PMMA is an amorphous polymer with no obvious melting point. It generally softens at 160 ℃ and can flow around 180 ℃. The decomposition temperature is 270 ℃. The adjustable range of injection temperature is relatively large. During injection molding, the general operating temperature is between 180 ℃ and 240 ℃. It absorbs a small amount of water and needs to be dried during production. It can be dried at a temperature of 100 ℃ for 2-3 hours. The shrinkage rate is 5 ‰. The overflow value is 0.05mm.

Applications

Production of optical lenses, household appliances, tableware, daily necessities, instrument dials, transparent covers, optical fibers, etc.