Tensistat is a moldable hydrophilic polymer material. Parts are hydrophilic directly from the molding machine or the extruder, without additional processes.
The best alternatives to Tensistat
The most hydrophilic moldable thermoplastic materials; PMMA and Nylon, have contact angles (CA) above 70°. This is not very hydrophillic, and not enough to obtain the desired properties: Capillary flow, prevention of air bubbles, printability etc.
Depending on the process parameters and the part design, contact angles for Tensistat is between 15° and 25°. This is enough to ensure; fast and stable capillary flow, prevention of air bubbles, printability etc.
PMMA/Acrylic CA=73°, cos(73°) = 0.2924
P100 hydrophilic coating CA=10°, cos(10°) = 0.9848
Tensistat CA=20°, cos(20°) = 0.9397
The cosine to the contact angle is a measure of how fast capillary flow will be. Tensistat will thus flow fast and controlled, but not as fast as when the device is coated with P100.
Cosine CA reference
0.25-0.3 The "capillary friction" of a channel. The threshold for capillary flow.
0.70 Slow but highly stable capillary flow.
0.90 Fast and stable capillary flow.
0.98 Very fast capillary flow. For some designs this may be too hydrophilic, and thus unstable.
1.00 Very fast and uncontrolled capillary flow. Very likely to trap air bubbles.