PMMA (Acrylic) Injection Molding Services On Aria
PMMA (Acrylic) injection molding parts offer high heat resistance, high gloss finish durability, and optical properties
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What is PMMA (Acrylic) lastic?
PMMA is a versatile thermoplastic with excellent optical clarity, high gloss finish, good mechanical properties, and chemical resistance, widely used in various applications such as lenses, light covers, and display components.
Additionally, It is also relatively easy to process, facilitating the production of complex shapes with precision. Moreover, it has a certain level of chemical resistance, enhancing its durability in different environments.
Description
Full Name
PMMA (Acrylic)
Process
Finishing options
Mold texturing，Pad printing，Laser engraving，Electroplating, Bead Blasting
Appearance
Clear or Transparent
Prices
$
Features
Density
Strengths
High mechanical rigidity, Excellent transparency, Easy to polish, low water absorption
Tensile Strength
10400 PSI
Elongation at Break
4-5%
Hardness
Rockwell R hardness of 105
Advantages of PP Injection Molding
There are many benefits derived from plastic molding, Some of the advantages of the material include:
Excellent Optical Properties
Superior Aesthetic Qualities
PMMA can attain a high-gloss finish, giving molded products a smooth, shiny and visually appealing look.
Good Mechanical Properties
Acrylic exhibits good dimensional stability. Once molded, the parts maintain their shape and size over time
Ease of Processing
PMMA is fast and efficient, enabling high-volume production and cost-effective manufacturing of numerous identical parts.
Chemical Resistance
It shows resistance to a variety of chemicals such as dilute acids, alkalis, and some solvents.
Applications of PMMA (Acrylic) Injection Molding
Acrylic Injection Molding Material Properties
PMMA (Acrylic) Plastic Properties
Value
Tensile Strength (Yield) （MPa）
66
Flexural Modulus（GPa）
2.96 - 3.3
Impact Resistance (Izod Impact, Notched)
0.999 - 3.81 ft-lb/in
Maximum Service Temperature（℃）
90
Chemical Formula
(C5O2H8)n
Glass Transition Temperature（℃）
85–165 °C
Heat Deflection Temperature（℃）
96
Drying Temperature（℃）
80-90
Drying Time（hr）
3
Mold Temperature（℃）
40～90
Melt Temperature（℃）
205～230
Injection Pressure（MPa）
100～170
Injection Speed（ mm/sec）
50–100
Cooling Time（S）
20～30
Scrap Quantity（mm）
2～6
Back Pressure（MPa）
1３～2８
Clamping Force（ton/in2）
4
Return Speed (rpm)
60～80
Shrinkage
0.3-0.8%
PMMA (Acrylic) Injection Molding Design Guide
Wall Thickness
PMMA is typically between 1.5 – 5 mm. Thinner walls can lead to issues such as sink marks, short shots (incomplete filling of the mold), and poor structural integrity.
Radii
Avoid sharp corners in acrylic as it’s sensitive; they impede moldability and cause stress. Min radius: 25% wall thickness; for max strength, use 60%.
Draft Angle
A draft angle is necessary to facilitate the ejection of the molded part from the mold. For the external surfaces of PP living – hinge – containing parts, a draft angle of 1 – 5° is usually sufficient.
Rib
The rib thickness is typically 0.5 – 0.7 times that of the adjacent wall to minimize sink marks and cooling issues. Also, consider the rib height carefully to avoid warping; limit it to around three times its base width as a guideline.
Booses
The diameter of the boss should be at least twice the diameter of the screw to ensure sufficient strength. A recess or counterbore can be designed around the boss to prevent the screw head from protruding above the surface of the part.
Part Tolerance
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