Semitron® ESd 225
Semitron® ESd 225 is a static dissipative acetal designed for use where electrical discharge in operation is a problem. It is commonly used for sensitive electronic components including: integrated circuits, hard disk drives and circuit boards. It is also an excellent choice for material handling applications, and components in high speed electronic printing and reproducing equipment.
Semitron® ESd 225 is dissipative and electrically stable. Static electricity is dissipated through this product as readily as it is dissipated along the surface. Semitron® ESd 225 is ideal for fixtures used in the manufacturing of hard disk drives or for handling in-process silicon wafers. It is tan in color.
| Specification | Test | Value | Units |
| Specific Gravity, 73°F | D792 | 1.33 | – |
| Tensile Strength @ Yield, 73°F | D638 | 5,400 | psi |
| Tensile Modulus of Elasticity, 73°F | D638 | 200,000 | psi |
| Tensile Elongation (at break), 73°F | D638 | 15 | % |
| Flexural Strength, 73°F | D790 | 7,300 | psi |
| Flexural Modulus of Elasticity | D790 | 220,000 | psi |
| Shear Strength, 73°F | D732 | 6,000 | psi |
| Compressive Strength – Ultimate | psi | ||
| Compressive Strength at 2% Deformation | psi | ||
| Compressive Strength at 10% Deformation | D695 | 8,000 | psi |
| Deformation Under Load | % | ||
| Compressive Modulus of Elasticity, 73°F | D695 | 175,000 | |
| Compressive Strength ⊥ to Laminate (Modulus) | psi | ||
| Compressive Strength ⊥ to Laminate (Yield) | psi | ||
| Compressive Strength ⊥ to Laminate (Ultimate) | psi | ||
| Hardness, Durometer (Shore “D” scale) | D2240 | – | |
| Hardness, Rockwell (Scale as noted) | D785 | M50 (R108) | Rockwell M |
| Izod Impact, Notched @ 73°F | D256 Type “A” | 1.5 | ft.lbs/in. of notch |
| Coefficient of Friction (Dry vs Steel) Static | 0.30 | ||
| Coefficient of Friction (Dry vs Steel) Dynamic | PTM55007 | 0.29 | |
| Maximum Static Bearing Load (P) | 1,000 | psi | |
| Maximum Unlubricated No Load Bearing Velocity (V) | 50 | ft/minute | |
| Maximum Limiting PV (Unlubricated) | PTM55007 | 2,000 | psi x ft/min. |
| Wear Factor “K” x 10-10 | PTM55010 | 30 | Cubic in.-min/ft.lbs.hr |
| Sand Wheel Wear/Abrasion Test | 50 | UHMW=100 | |
| Minimum Mating Surface Hardness | Rockwell (Brinnell) | ||
| Coefficient of Linear Thermal Expansion | E-831 (TMA) | 9.3 | in/in/°F x 10-5 |
| Coefficient of Thermal Expansion // to Laminates | 9.3 | in/in/°F x 10-5 | |
| Coefficient of Thermal Expansion I to Laminates | 9.3 | in/in/°F x 10-5 | |
| Softening Point | °F | ||
| Heat Deflection Temperature 264 psi | D648 | 225 | °F |
| Embrittlement Temperature | °F Min. | ||
| Continuous Service Temperature in Air | 180 | °F Max. | |
| Short Term Service Temperature | 200 | °F Max. | |
| Tg-Glass Transition (Amorphous) | D3418 | N/A | °F |
| Melting Point (Crystalline) Peak | D3418 | 320 | °F |
| Thermal Conductivity | F433 | – | BTU-in/(hr/ft F) |
| Dielectric Strength Short Term | D149 | – | Volts/mil |
| Surface Resistivity | D257 | 109 -1010 | ohm/cm |
| Volume Resistivity | ohm/cm | ||
| Dielectric Constant, 106 Hz | D150 | 4.31 | |
| Dissipation Factor, 106 Hz | D150 | .036 | |
| Flammability @ 3.1mm(1/8 in.) UL94 | UL 94 | HB | |
| Arc Resistance | seconds | ||
| Water Absorption, Immersion 24 Hours | D570 (2) | 2.0 | % |
| Water Absorption, Immersion Saturation | D570 (2) | 8.0 | % |
| Machinability Rating | 1 | 1=easy, 10=difficult | |
| Rod Diameter Availability (Off the Shelf) | .250-6.0 | inches | |
| Sheet Thickness Availability (Off the Shelf) | .250-2.0 | inches |
| Characteristics / Attributes | Static Dissipative / Easily Machined / Wear Resistant |
