Parkway-Thixomolding Part Design - Stiffness/Strength
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NEED INJECTION MOLDED STIFFNESS AND STRENGTH? ANSWER:
MAGNESIUM TXM

For many injection molded components the ideal design would minimize wall thickness and maximize part stiffness and strength. Unfortunately, thin wall moldable plastics are not very stiff and “high-strength” plastics are often difficult to mold in thin wall sections.

MAGNESIUM TXM SHIELDING SOLUTIONS PROVIDE:

» Injection molded versatility with parts typically molded at 0.020" (0.5 mm) wall sections and a spiral flow L/D of 600:1
» 20-times the stiffness (E = 6.5 MSI) of most plastics
» Material price that is lower than most engineering plastics and well below the “high strength” resins

If you need it to be stiff, consider Magnesium TXM!

Magnesium TXM components demonstrate tight-tolerances and follow “plastic design rules” for features such as ribs, bosses and gussets while requiring less draft and being readily moldable at thicknesses down to 0.020"(0.50 mm).

MATERIAL STIFFNESS AND DENSITY
Comparison of Specific Modulus and Density of selected injection moldable materials.

EQUIVALENT STIFFNESS TABLE

Example using this table:

To get a 30% Glass-Filled PC part with equivalent stiffness to a TXM part, the PC part would have to be :

• 93% THICKER than the AZ91D Magnesium

• 53% HEAVIER than the AZ91D Magnesium

 
Elastic Modulus (KSI)
Part
Thickness/
Volume
Part
Weight
AZ91D Magnesium 6500 1.00 1.00
ABS (FR) 320 2.73 1.79
PC (FR) 325 2.71 1.82
PEI (FR) 415 2.50 1.76
PC + 30%GL 900 1.93 1.53
Nylon 6/6 + 30%GL 1150 1.78 1.34
PEEK + 30%GL 1406 1.67 1.40
PC + 30% C  1950 1.49 1.09


RIGIDITY BALANCE

The Rigidity Balance illustrates the dramatic effect that thin wall, high elastic modulus Magnesium TXM can have on part design.


TYPICAL PROPERTIES OF TXM ALLOY AZ91D

Density/Specific Gravity lb/in^3(g/cc) 0.065(1.81)
Typical Wall Thickness -min in(mm) 0.020(0.50)
Elastic Modulus MSI (G Pa) 6.5(45)
Ultimate Strength KSI (M Pa) 36(243)
Yield Strength KSI (M Pa) 23.5(160)
Elongation % 6
Hardness Rockwell R 75
Thermal Conductivity Btu/ft-hr-F (w/m-K) 41.8(72)
Shielding Effectiveness @ 0.020" dB >85
UL94 Flame Exposure Results   DNI / DNB
Material Composition Mg + 9%AI + 1%Zn
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