High-impact resistant plastics are essential materials in modern engineering where durability and toughness are critical. From automotive components to industrial equipment, these plastics provide excellent resistance to shock, stress, and mechanical damage. In this article, we explore three high-impact resistant plastics widely used in durable engineering applications.
How Impact Resistance Is Measured in High-Impact Resistant Plastics?
Engineers rely on standardized tests to evaluate the durability of high-impact resistant plastics used in demanding engineering applications. When reviewing a manufacturer’s material data sheet, look for these three key metrics that indicate a plastic’s ability to absorb sudden force without breaking:
Notched Izod Impact (ASTM D256): Measures the energy required to break a notched sample with a swinging pendulum.
Gardner Impact (ASTM D5420): Uses a falling weight to determine the energy required to cause failure.
Instrumented Dart Impact (ASTM D3763): A multiaxial test that simulates a high-speed strike to determine a material’s ductility.
Pro Tip: Strength and toughness are often contradictory. Materials with greater tensile strength can become more brittle, while impact resistant plastics require a careful balance between strength and elongation at yield.
3 Common High-Impact Resistant Plastics
1. ABS (Acrylonitrile Butadiene Styrene)
ABS is an opaque, amorphous polymer known for its extreme toughness, even at low temperatures. It is a staple in the automotive and consumer goods industries.
Key Features: Hard, rigid, and electrically insulative.
Applications: Dashboards, Lego bricks, and protective housings.
Limitation: Poor UV resistance and low fatigue life; not ideal for outdoor use without additives.
2. Polycarbonate (PC)
Polycarbonate is widely considered the gold standard among high-impact resistant plastics. It combines outstanding toughness with transparency, making it ideal for safety and protective applications.
Key Features: High heat resistance, flame retardancy, and optical clarity.
Applications: Safety glasses, medical device housings, and riot shields.
Limitation: Susceptible to scratching (requires coating) and is more expensive than standard resins.
3. PETG (Polyethylene Terephthalate Glycol)
While PET is common for single-use bottles, PETG (glycol-modified) rivals polycarbonate for impact resistance at a much lower price point.
Key Features: Food-safe, biocompatible, and chemically resistant.
Applications: Medical packaging, instrument trays, and implants.
Limitation: Lower heat resistance compared to PC.
Environmental Factors That Affect Impact Resistant Plastics
Even high-impact resistant plastics can fail when exposed to harsh environmental conditions. Engineers must account for these factors when selecting materials:
Temperature: Many polymers, like Polypropylene (PP), become brittle in cold temperatures (the “glass transition” effect).
UV Exposure: Plastics like Acetal (POM) and Polycarbonate (PC) can degrade and crack if left in the sun without UV stabilizers.
Chemical Exposure: Certain solvents can cause stress-cracking in otherwise tough materials like ABS.
Design Tips for Maximizing Impact Resistance
Material selection is only part of the equation. Proper engineering design significantly improves the durability of high-impact resistant plastics:
Radius Your Corners: Sharp internal corners act as “stress concentrators.” Always use generous fillets to distribute force.
Rib Placement: Place stiffening ribs in areas of compression rather than tension.
Allow for “Give”: A part that can flex slightly is less likely to shatter than a completely rigid one.
Manage Weld Lines: Ensure injection molding weld lines (where plastic flows meet) are located away from potential impact zones.
Mechanical Property Comparison: Impact Resistance vs. Strength
Material | Impact Resistance | Tensile Strength | Strength–Toughness Balance | Best Use Case |
ABS | High | Medium | Excellent toughness with moderate strength | Consumer product housings and automotive interiors requiring durability and cost efficiency |
Polycarbonate (PC) | Very High | High | Industry-leading impact resistance with high structural strength | Safety equipment, transparent guards, and medical enclosures exposed to impact |
PETG | High | Medium | Strong impact performance at lower cost than PC | Medical packaging, trays, and clear enclosures with moderate temperature exposure |
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