Page 322 - Engineering Plastics Handbook

280 Engineering Plastics

Pressure, MPa
0.0 0.2 0.4 0.6 0.8 1.0
8000 200
Velocity 800 ft/min (4.06 m/s)
Torlon 4301
7000
Torlon 4275
Torlon 4435
6000
Vespel SP-21 150
Wear depth, µin/h 4000 100 Wear depth, µm/h
Victrex X50FC30
5000
3000
2000 50

1000
0 0
0 20 40 60 80 100 120 140
Pressure, psi
(b)
Figure 12.20 (Continued)

Processing
Adhesive and coating formulations
Most formulations for polyamide-imides start with a dipolar aprotic sol-
vent such as NMP, DMAC, DMF, or DMSO and then diversify from
there. To reduce the solution viscosity, diluents such as xylene and

5000
4500 Viscosity at 25°C
Viscosity at 40°C
4000 Viscosity at 50°C
3500
Viscosity, cps 2500
3000

2000
1500
1000
500
0
10 15 20 25 30 35 40
Polymer solids, %

Figure 12.21 Al-10 solution viscosity in NMP.