T-196
Table 18-2 Property Chart for Basic Polymers for Gearing
* These are average values for comparison purpose only.
Source: Clifford E. Adams, “Plastic Gearing”, Marcel Dekker Inc., N.Y. 1986. Reference 1.
Table 18-3 Physical Properties of DELRIN Acetal Resin and ZYTEL Nylon Resin
* Test conducted at 73°F
Reprinted with the permission of E.I. DuPont de Nemours and Co.; see Reference 5.
Tensile
Strength
* Yield
• Break
Izod
Impact
Strength
Notched
Units
ASTM
1. Nylon 6/6
2. Nylon 6
3. Acetal
4. Polycarbonate
30% G/F,
15% PTFE
5. Polyester
(thermoplastic)
6. Polyphenylene
sulfide
30% G/F
15% PTFE
7. Polyester
elastomer
8. Phenolic
(molded)
in./in.
D955
.015/.030
.013/.025
.016/.030
.0035
.020
.002
.012
.007
psi
D638
*11,200
*11,800
*10,000
*17,500
*8,000
·12,000
*19,000
*3,780
·5,500
·7,000
psi
D790
175,000
395,000
410,000
1,200,000
340,000
1,300,000
––
340,000
ft×lb/in.
D256
2.1
1.1
1.4/2.3
2
1.2
1.10
––
.29
°F
D648
220
150
255
290
130
500
122
270
D792
1.13/1.15
1.13
1.42
1.55
1.3
1.69
1.25
1.42
Mold
Shrinkage
Flexural
Modulus
Specific
Gravity
Water
Absorp.
24hrs.
Deflect.
Temp.
@264psi
ASTM
Properties – Units
“DELRIN”
500 100
“ZYTEL” 101
.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.°F
Water Absorption
24 hrs. %
Saturation, %
Specific Gravity
D638*
D732*
D256*
D638*
D790*
D785*
D696
D570
D570
D792
10,000
9,510
1.4 2.3
15 75
410,000
M 94, R 120
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
M 94, R 120, etc.
1.14
%
D570
1.5
1.6
0.2
0.06
0.08
0.03
0.3
0.45
Coeff. of
Linear
Thermal
Expan.
10–5 °F
D696
4.5 varies
4.6
5.8
1.50
5.3
1.50
10.00
3.75
