Materials and Tools
Delrin® (Polyoxymethylene)
Delrin® is a rugged polymer that serves as an excellent choice for long-term mechanical stability for products such as fittings and threaded adapters. It is important to note that Delrin, while being strong mechanically, cannot tolerate to be in the presence of acidic or basic solutions for long periods of time, as the polymer will degrade. It is best to use Delrin with neutral pH aqueous solutions or organic solutions for guaranteed best performance.
| Temperature Range | up to 60 °C |
|---|---|
| Thread Strength | Excellent |
| Oxygen Permeability | N/A |
| pH Range | 6 to 8 |
| Sterilization Techniques | |
| Autoclavable? | Y |
Delrin (Polyoxymethylene) Extended Properties
| General | Comments | Units | ||
|---|---|---|---|---|
| Density | ASTM D792 | g/cc | 1.42 | |
| Melt Flow | 1.05kg/190 °C | g/10 min | 1 | |
| Water Absorption | 24 hour | ASTM D570 | ||
| Moisture Absorption at Equilibrium | 50% RH | ASTM D570 | % | 0.22 |
| Water Absorption at Saturation | Immersion | ASTM D570/ ISO 62 | % | 0.9 |
| Hardness, Rockwell M | ASTM D785 | - | 94 | |
| Hardness, Rockwell R | ASTM D785 | - | 120 | |
| Mechanical | Comments | Units | ||
| Tensile Strength | Ultimate | ASTM D638 | MPa(psi) | 69(10,008) |
| Elongation | break | ASTM D638 | % | 75 |
| Modulus of Elasticity | GPa | ASTM D638 | 406 ksi | 2.8 |
| Flexural Modulus | GPa | ASTM D790 | 421 ksi | 2.9 |
| Flexural YieldStrength | ASTM D790 | MPa(psi) | 99 | |
| Izod Impact Strength | J/cm | ASTM D256 | 2.3ft-lb/in | 1.23 |
| Unnotched, J/cm no break | ASTM D256 | 1,871ft-lb/in | 999 | |
| Izod Impact Low Temp | Notched, J/cm at -40 °C | ASTM D256 | 1.8ft-lb/in | 0.96 |
| Tensile Impact Strength | kJ/m2 | ASTM D1822 | 170ft-lb/in2 | 358 |
| Compressive Yield Strength | ASTM D695 | MPa(psi) | 124(17,985) | |
| Shear Strength | ASTM D732 | MPa(psi) | 66(9,573) | |
| Fatigue Strength | Flexural fatigue endurance limit, 50% RH, | ASTM D672 | MPa(psi) | 32(4,641) |
| Fatigue Strength | Flexural fatigue endurance limit, 50% RH, 1E+6 cycles | ASTM D672 | MPa(psi) | 32(4,641) |
| Poissons Ratio | - | 0.35 | ||
| Coefficient of Friction | Dynamic vs. carbon steel, 50mm/s (2in/s) | 2MPa | 0.35 | |
| Thermal | Comments | Units | ||
| Coefficient of Thermal Expansion | linear 20 °C linear 100 °C |
µm/m- °C µm/m- °C |
60µin/in- °F 83µin/in- °F |
122 149 |
| Deflection Temperature | at 0.46 MPa, °C at 1.8 MPa, °C |
ASTM D648 ASTM D648 |
336 °F 257 °F |
169 125 |
| Melting Point °C | °C | ASTM D3418 | 347 °F | 175 |
| Maximum Service Temperature | Deflection Temp at 1.8 MPa | - | 257 °F | 125 |
| Thermal Conductivity | W/m-K | - | 2.8BTU-in/hr-ft2- °F | 0.4 |
| Flammability, UL94 | (5=V-0;4=V-1;3=V-2;1=HB) | UL94 | HB | 1(HB) |
| Electrical | Comments | Units | ||
| Electrical Resistivity | ASTM D257 | ohm-cm | 1E+15 | |
| Dielectric Constant | at 1MHz | ASTM D150 | - | 3.7 |
| Dielectric Strength, kV/mm | 2.3mm (90 mils); Short Time | ASTM D149 | 500 kV/in | 19.7 |
| Dissipation Factor | at 1 MHz | ASTM D150 | - | 0.005 |
| Arc Resistance | ASTM D495 | sec | 220 |