In high-performance sealing systems, material selection directly affects cycle life, friction torque, and leak-tight reliability. The 20% Ekonol PTFE bushing for pump rotor is one of the most widely specified configurations because it combines a PTFE matrix with 20% aromatic polyester reinforcement, reducing cold flow and improving dimensional stability under load. Compared with a general-purpose aromatic polyester PTFE sleeve bearing, this grade delivers lower wear against hardened shafts and better resistance to extrusion in rotary seal glands. For demanding chemical pumps, mixers, and compressors, a high wear Ekonol PTFE bushing helps extend maintenance intervals by limiting abrasive particle embedding and maintaining a stable running clearance. As an experienced 20% Ekonol PTFE bushing manufacturer, we machine these bushings to tight tolerances from compression-molded or isostatic blanks, allowing consistent performance across high-volume pump programs and aftermarket rebuilds.
The Ekonol filled PTFE bushing for seal is designed for applications where the bushing acts as a secondary sealing element, a wear ring, or a throat bushing in mechanical seal chambers. The reinforced PTFE grade accommodates intermittent dry running, low-viscosity fluids, and abrasive slurries better than unfilled PTFE because the aromatic polyester filler creates a harder wear surface while retaining the low-friction characteristics of PTFE. This balance reduces shaft scoring and helps maintain flush flow across the seal faces.
Key material and design parameters for the Ekonol filled PTFE bushing for seal are listed below.
Material properties are measured on compression-molded specimens according to standard test methods. The values shown below represent typical production results, not minimum specifications.
| Property | Test Method | Typical Value |
|---|---|---|
| Density | ASTM D792 | 2.10 g/cm³ |
| Tensile strength | ASTM D4894 | 2,800 psi |
| Elongation at break | ASTM D4894 | 180% |
| Compressive strength, 1% deformation | ASTM D695 | 1,450 psi |
| Hardness | ASTM D2240 | Shore D 65 |
| Coefficient of friction, dry | ASTM D3702 | 0.08–0.12 |
| Wear factor K | ASTM D3702 | 8 × 10⁻⁸ mm³/N·m |
| Thermal conductivity | ASTM E1530 | 0.45 W/m·K |
| Water absorption, 24 h | ASTM D570 | <0.01% |
Standard dimensional ranges and tolerances for the Ekonol filled PTFE bushing for seal are shown in the following table. Bushing walls can be thin or thick depending on housing space and load requirements.
| Dimension | Standard Range | Typical Tolerance |
|---|---|---|
| Inside diameter | 0.250 in – 12.000 in | ±0.001 in |
| Outside diameter | 0.500 in – 14.000 in | ±0.001 in |
| Length | 0.250 in – 6.000 in | ±0.005 in |
| Wall thickness | 0.062 in – 1.500 in | ±0.003 in |
For installation, the housing bore should be cleaned and deburred, and the bushing can be pressed in place or retained with a flange or snap ring depending on gland design. A small running clearance of 0.001–0.003 in per inch of shaft diameter is typical for seal throat bushings. Chamfered edges and axial slits can be added for applications requiring controlled flow restriction or thermal expansion relief.
