| Surface roughness | TPU | PTFE | ||
| Rtmax | Ra | Rtmax | Ra | |
| Sliding surface | ≤ 2.5 µm | 0.1–0.5 µm | ≤ 2 µm | 0.05 - 0.3 µm |
| Groove bottom | ≤ 6.3 µm | ≤ 1.6 µm | ≤ 6.3 µm | ≤ 1.6 µm |
| Groove side | ≤ 15 µm | ≤ 3 µm | ≤ 15 µm | ≤ 3 µm |
| Bearing area: 50-95% and 0.5 Rz cutting depth (based on Cref = 0%) | ||||
| Recommended Size mm | ||||||
| d/f8 | D/H9 | OD | L/+0.2 | Rmax | D1/H11 | |
| ＜ | ≥ | |||||
| 5 | 12 | d + 4.8 | 1.78 | 3.7 | 0.4 | d + 1.5 |
| 12 | 65 | d + 6.8 | 2.62 | 5.0 | 0.7 | d + 1.5 |
| 65 | 180 | d + 8.8 | 3.53 | 6.0 | 1.0 | d + 1.5 |
| 180 | 300 | d + 12.2 | 5.33 | 8.4 | 1.5 | d + 2.0 |
| 300 | 650 | d + 16.0 | 7.00 | 11.0 | 1.5 | d + 2.0 |
| 650 | 1000 | d + 20.0 | 8.40 | 14.0 | 2.0 | d + 2.5 |
| 1000 | 2500 | d + 27.3 | 10.00 | 16.0 | 2.0 | d + 2.5 |
| Operating parameters | ||||
| Material | Temperature | Speed | ||
| Sealing components | Elastomer | Minimum °C | Maximum °C | Maximum m/s |
 XHPU |
NBR70 | -20 | +100 | 5 |
 XSPU |
-20 | |||
 PTFE v |
-30 | 10 | ||
 PTFE g |
||||
 PTFE b |
FPM75 | -20 | +200 | |
 PTFE c |
||||
 UHMWPE |
NBR70 | -30 | +90 | |
| MVQ70 | -55 | |||
| Ordering example | |
| Introduction | Dust seal TA27 - F |
| d x D x L [mm] | 70 x 78.8 x 6.0 |
| Sealing material | PTFE b / NBR70 |
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