ABS Injection Molding
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Acrylonitrile Butadiene Styrene (ABS) is one of the most versatile and widely used thermoplastics in the injection molding industry. Known for its excellent balance of strength, toughness, and processability, ABS is ideal for manufacturing durable, lightweight, and aesthetically appealing parts.
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What is ABS Plastic?
ABS is a terpolymer made by polymerizing styrene and acrylonitrile in the presence of polybutadiene. This unique composition gives ABS its distinctive properties:
Acrylonitrile:
Provides chemical resistance and rigidity.
Butadiene:
Contributes impact resistance and toughness.
Styrene:
Enhances processability and surface finish.
Description
Full Name
Acrylonitrile Butadiene Styrene
Process
Finishing options
Mold texturing，Pad printing，Laser engraving，Electroplating, Bead Blasting
Applications
Impact-resistant applications, Appliances, Housings, Toys
Prices
$
Features
Appearance
Black, Natural color
Strengths
Good Scratch Resistance, High Gloss, Strong toughness, Ease of processing
Tensile Strength
5500 PSI
Elongation at Break
30%
Density
1.04~1.06 g/㎤
Advantages of ABS Injection Molding
There are many benefits derived from ABS plastic molding, Some of the advantages of the material include:
Durability
ABS is highly impact-resistant and can withstand tough conditions, making it suitable for a wide range of applications.
Excellent Surface Finish
The material provides a smooth, glossy surface, which is ideal for aesthetic products.
Versatility
ABS can be molded into complex shapes with high precision, enabling the production of intricate parts.
Electrical Insulation
ABS has excellent electrical insulating properties, making it suitable for electronic components.
Good Dimensional Stability
ABS retains its shape well under varying temperature and humidity conditions.
Applications of ABS Injection Molding
ABS plastic can be easily processed and shaped, so the products made from this plastic are always diverse and rich, giving consumers many different choices.
ABS Injection Molding Material Properties
ABS Plastic Properties
Value
Tensile Strength (Yield) （MPa）
13.0 - 65.0
Flexural Modulus（GPa）
0.200 - 5.50
Impact Resistance (Izod Impact, Notched)
0.380 - 10.3 J/cm (0.712 - 19.3 ft-lb/in)
Maximum Service Temperature（℃）
80.0 - 100
Chemical Formula
(C8H8·C4H6·C3H3N)n
Glass Transition Temperature（℃）
108 - 109
Heat Deflection Temperature（℃）
88-89
Drying Temperature（℃）
80–90
Drying Time（hr）
1.5
Mold Temperature（℃）
45～80
Melt Temperature（℃）
190～235
Injection Pressure（MPa）
90～140
Injection Speed（ mm/sec）
240
Cooling Time（S）
10～60
Scrap Quantity（mm）
2～8
Back Pressure（MPa）
９～18
Clamping Force（ton/in2）
2～2.5
Return Speed (rpm)
70～100
Shrinkage
0.4% to 0.9%
ABS Injection Molding Design Guide
Uniformity
Wall Thickness
Try to maintain a consistent wall thickness throughout the part. Sudden changes in wall thickness can lead to sink marks, warping, and internal stresses. The ideal wall thickness for ABS is usually between 1.5 – 3.5mm. For example, if you’re designing a box – shaped part, keep the walls as close to the same thickness as possible.
Minimum Thickness
The minimum wall thickness, around 0.8 – 1mm for ABS (varying with part size and application), must ensure strength and functionality. But very thin walls pose filling challenges in injection molding.
Maximum Thickness
The wall thickness range of ABS products is generally between 1.5 ~ 5.0mm, and the maximum thickness of the thicker ABS sheet is generally 5mm ~ 10mm.
Rib Design
Rib thickness is 40 – 60% of adjacent wall thickness. Height is less than 3 times base width to avoid warping. E.g., for a 3mm base width rib, height < 9mm.
Bosses Design
Bosses for mounting or inserts. Outer diameter ≥ 1.5 times hole diameter. Design boss wall thickness carefully to prevent sink marks and ensure strength.
Draft Angle
For ABS parts, 1 – 2° draft angle for ≤ 50mm depth, 2 – 3° for deeper ones. Apply to all vertical surfaces parallel to mold opening.
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