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251. PMMA (Acrylic)

Plastic molding is a variety of forms (powder, granules, solution and dispersion) of the desired shape of the products made of plastic or blank process. Up to thirty several molding method. Plastic molding is mainly determined by the choice of the type of plastic (thermoplastic or thermoset), initial shape and the shape and size products.

PMMA (Acrylic)
1. PMMA performance
PMMA is amorphous polymer, commonly known as plexiglass. Excellent transparency, good heat resistance (heat distortion temperature of 98 degrees Celsius), and has good impact properties, moderate mechanical strength of its products, the low surface hardness, scratch easily, leaving behind traces of a hard object, and the PS phase ratio, not easy to rattle, accounting for 1.18g/cm3. PMMA has excellent optical properties and resistance to climate change characteristics. White light penetrating up to ninety-two%. PMMA products have very low birefringence, particularly suitable for production of DVD and so on. PMMA has a room temperature creep. As the load increased, the time growth, can lead to stress cracking phenomenon.
2. PMMA process characteristics
PMMA processing requirements more stringent, it is very sensitive to moisture and temperature, before processing to fully dry (recommended drying conditions of 90 degrees Celsius, 2 to 4 hours), the melt viscosity is required at the higher (225 - 245 degrees C) and pressure molding, mold temperature 65-80 degrees Celsius in the well. PMMA is not very good stability, the high temperature or at higher temperatures stay too long will cause degradation. Screw speed is not too large (then about sixty percent), thick PMMA parts that are vulnerable to a "hole", must take a large gate, "low melt temperature, higher mold temperature, slow" injection approach to processing.
3. Typical Applications:
Automotive (signal equipment, instrument panel, etc.), pharmaceutical industry (blood storage containers, etc.), industrial (DVD, light scattering devices), consumer goods (beverage cups, stationery, etc.).