Introduction

PA (Nylon), a popular engineering plastic, is a synthetic polymer widely used due to its excellent mechanical properties, stiffness, toughness, shock absorption and resistance to wear.

Applications: Gears, bearings, thin-walled parts, screws, structural parts, pump parts, cameras.

Behavior: Nylon is very vulnerable to moisture, and can be more likely to suffer warping caused by a non-linear shrink.

PropertiesMetricOther
Density1.01 – 1.20 g/cc0.0365 – 0.0434 lb/in³
Hardness68 – 11368 – 113
Tensile Strength (Yield)13.0 – 65.0 MPa1890 – 9430 psi
Tensile Strength (Ultimate)22.1 – 49.0 MPa3210 – 7110 psi
Elongation at Yield0.62 – 30 %0.62 – 30 %
Elongation at Break3.0 – 150 %3.0 – 150 %
Dielectric Strength18.0 – 50.0 kV/mm457 – 1270 kV/in
Melt Temperature180 – 274 °C356 – 525 °F

Design Guideline

Wall Thickness

Between 1 mm and 3 mm

Keeping walls as thin and constant as possible will reduce warping and sinking

Thickness gradient

Wall thickness should increase by no more than three times

Transition between thicknesses can be made smoother with fillets

Internal edges

Rounded, more than half wall thickness

Add fillet with largest possible radius

External edges

Rounded, full wall thickness plus internal fillet

Add fillet with largest possible radius

Draft angle

Increase draft by 1° for every 25 mm (for parts taller than 50 mm)

Add draft to ease ejection and avoid drag marks

Textured finish

Increase draft angle by 1-2°

Increase draft to ease ejection and avoid drag marks

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