Property Chart for Basic Polymers for Gearing - SDP/SI Tech Library D190-T133

TABLE 1.39 PROPERTY CHART FOR BASIC POLYMERS FOR GEARING

	Water Absorption 24 hr	Mold Shrinkage	Tensile Strength *Yield #Break	Flexural Modulus	Izod Impact Strength Notched	deflect. Temp. @264 psi	Coeff. Linear Thermal Expan.	Specific Gravity
Units	%	In./In.	psi	psi	ft-lb/in.	^oF	10^{-5 o}F
ASTM	D570	D955	D638	D790	D256	D648	D696	D792
1.Nylon 6/6 2.Nylon6 3.Acetal 4.Polycarbonate 30% G.F 15% PTFE 5.Polyester (thermoplastic) 6.Polyphenylene Sulfide 30% Sulfide 15% PTFE 7.Polyester elastomer 8.Phenolic (molded)	1.5 1.6 0.2 0.06 0.08 0.03 0.3 0.45	.015/.030 .013/.025 .016/.030 .0035 .020 .002 .012 .007	11,200 11,800 10,000 17,500 8,000 #12,000 19,000 *3,780 #5,500 #7,000	175,000 395,000 410,000 1,200,000 340,000 1,300,000 -- 340,000	2.1 1.1 1.4/2.3 2 1.2 1.10 -- .29	220 150 255 290 130 500 122 270	4.5 varies 4.6 5.8 1.50 5.3 1.50 10.00 3.75	1.13/1.15 1.13 1.42 1.55 1.3 1.69 1.25 1.42

These are average values for comparison purposes only.
Source: Clifford E. Adams, "Plastic Gearng", Marcel Dekker Inc. N.Y.1986. Ref.13

TABLE 1.40 PHYSICAL PROPERTIES OF OELRIN ACETAL RESIN AND ZYTEL NYLON RESIN

Properties - Units	ASTM	"DELRIN" 500 100
			"ZYTEL" 100
			.2% Moisture	2.5% Moisture
Yield Strength, psi Shear Strength, psi Impact Strength, (Izod) Elongation at Yield,% Modulus of Elasticity, psi Hardness, Rockwell Coefficient of Linear Thermal Expansion, in/in. ^oF Water Absorption 24hrs.% Saturation, % Specific Gravity	D638 D732 D256 D638 D790 D785 D696 D570 D792	10,000 9,510 1.4 2.3 15 75 410,000 M94 R120 4.5 x 10^{-5 0.25 0.9 1.425}	11,800 9,600 0.9 5 410,000 M79 R118 4.5 x 10^{-5 1.5 8.0 1.14}	8,500 2.0 25 175,000 M59 R108 1.14

Test conducted at 73^o F
Reprinted with the permission of E.l. DuPont de nemours and Co.; see Ref. 8

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