Polycarbonate had earned the tag because the best option material for usage from the automotive industry. However, in recent years, Polymethyl Methacrylate, the PMMA polymer or commonly known acrylic plastic, has efficiently risen on the growing demands of the automotive industry in replacing polycarbonate for the most important utilization in the industry, namely, automotive glazing.

Long established for usage in several vehicle applications for example decorative trim, ambient lighting and door entry strips, automotive glazing is among those fields that provide the best growth risk of PMMA.
Related key features of acrylic plastic that make it well suited for the whole process of automotive glazing are discussed below.
Lightweight
To produce a comparison on a very basic level, PMMA is half the body weight and much more transparent than glass, thereby providing really clear visibility even during the situation of fluctuating and unstable temperatures. Due to its molecular structure, thermoformed pmma plastic are actually used almost mainly for car window glazing where all the necessary requirements for light-weight materials which can be safe, easy to process and perform in all weathers are met.
On top of Scratch Resistance
Another important desire for glazing is scratch resistance. Standard PMMA already gets the highest surface hardness coming from all thermoplastics even though uncoated. However, for automotive glazing, you’ll find stringent conditions to get fulfilled in order to meet the perfect condition of scratch resistance. The application of a coating is thus mandatory. Considering that PMMA is intrinsically UV as well as weathering-resistant, a single-step coating is useful. On the other hand, thermoplastics which may have low effectiveness against weathering demand a two-step coating system. This ends in relatively expense for coating.
New design possibilities
PMMA glazing is Forty to fifty percent lighter than conventional glass, which piques the eye of automobile manufacturers. Using the advantages being immediately obvious, PMMA is currently considered the proper fit for automotive glazing. Weight savings apart, the transparency of acrylic plastic in addition to its quite high weathering resistance, pleasant acoustic properties, and exceptional form ability allow freedom enabling entirely new design possibilities.
Less stress birefringence
PMMA exhibits little or no stress birefringence this also operates as a major benefit over other thermoplastics for example polycarbonate, that has been primarily employed for glazing before. In comparison with traditional materials for example polycarbonate, moulded PMMA, supplies a distinct chance of functional integration – reducing recess depth and assembly costs.
Environment-friendly
The brand new goal from the automotive companies are to build up clean low fuel consumption vehicles. Given the awareness along with the requirement for eco-friendly initiatives with the current economic scheme of things, PMMA operates as a perfect alternative to glass from the automotive glazing segment. As vehicle manufacturers push the bounds of design, also is automotive glazing evolving.
SUMIPEX® PMMA polymer offers characteristics that meet the latest challenges from the transportation sector. It’s a monumental challenge for auto makers that are looking to adjust to recent environmental requirements and therefore are contemplating alternatives that reduce greenhouse gas and save fuel. Oahu is the perfect partner within this movement since it makes cars lighter.
As a leading manufacturer of SUMIPEX® PMMA polymer, Sumitomo Chemical is glad to assist you in understanding its properties and how it best suited to automotive glazing.
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How do a liquid which has just 5 carbon atoms, 2 oxygen atoms and eight hydrogen atoms supply for high quality purposes where thermal resistance, electrical resistance and mechanical strength is of prime importance? A better solution is based on one word – “Polymerisation”.
Through this infographic, we trace your way of MMA (Methyl Methacrylate), a liquid monomer that is polymerised to result in PMMA polymer (Polymethyl Methacrylate), and it is various grades.

MMA may be polymerised to PMMA through solution polymerisation, emulsion polymerisation and bulk polymerisation techniques. Each one of these reactions take place in a good a catalyst. The resulting pmma thermoplastic may be modified to various shapes, sizes and forms depending on the additives.
The varied grades of SUMIPEX®, the Polymethyl methacrylate resin produced by Sumitomo Chemical, which might be obtained on adding additives are:
• ‘High Impact Grade of SUMIPEX® PMMA’ – Properties like high flow and good heat resistance get this ideal for manufacturing extruded sheets/ pipes/ rods, construction materials, automotive parts and industrial applications
• ‘Extrusion Grade of SUMIPEX® PMMA’ – Good extrusion molding characteristics, high surface hardness, superb weatherability and excellent chemical resistance are the properties of this grade that favour its used in extruded sheets/ pipes/ rods.
• ‘Heat Resistant Grades of SUMIPEX® PMMA’ – Excellent heat resistance, excellent surface hardness and mechanical strength enables using this grade in automotive parts like tail lamp, instrument cluster, optical Lens, general lamps, etc.
• ‘Optical Grades of SUMIPEX® PMMA’ – With excellent heat resistance and flow properties, the optical grades with extremely low amounts of foreign contaminants can be used for light Guide panels and optical lenses.
• ‘High Flow Grade of SUMIPEX® PMMA’- With characteristics like high-flow during injection molding and good moldability, this grade is recommended for intricate parts and thin-wall parts molding like watch and clock cover, lighting cover, name plate, house ware, etc.
• ‘General Purpose Grades of SUMIPEX® PMMA’ – General Purpose Grades determine distinction between normal and optical grades/special grades. General Purpose Grades like MH, LG, LG2, etc. are available under “Extrusion Grade”, “Heat Resistance Grade” and “High Flow Grade”. With balanced properties like heat resistance and mechanical strength, this grade is acceptable for making wide range of products like house ware, stationery, telephone buttons, piano keys, electrical accessories, ornaments, etc.
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