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EMI/RFI Shielding Gaskets
These gaskets absorb electromagnetic interference (EMI) and radio frequency interference (RFI) to prevent inaccurate signals, flickering displays, and other electrical problems. They compress to fill gaps and complete a grounding path around doors and access panels.
Sheets work well between two flat surfaces.
Half-round gaskets work well in grooves. Use a gasket slightly thicker than the depth of the groove; it will compress to fill the gap.
Urethane foam gaskets block EMI and RFI in most applications. Adhesive-back gaskets are wrapped with conductive aluminum foil and stick on with a conductive adhesive. They meet UL 94 V-0, so they self-extinguish within 10 seconds if they catch fire and won’t spread the fire by dripping. Polyurethane foam gaskets are covered with a conductive nickel/copper braided fabric. A nonconductive adhesive holds them in place. To protect sensitive equipment, they block at least twice as much interference as urethane foam gaskets. They meet UL 94 V-0, so they self-extinguish within 10 seconds if they catch fire and won’t spread the fire by dripping. Cut these gaskets to length with scissors.

Foam Sheet with
Adhesive Backing
| Thickness | Width | Length | Interference Reduction @ Frequency | Backing Type | Temperature Range, °F | Color | For Use Outdoors | Specifications Met | Each | |
Urethane Foam | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 0.05" | 1" | 10" | 90 dB @ 1 GHz | Adhesive | -40° to 158° | Gray | No | UL 94 V-0 | 0000000 | 000000 |
Polyurethane Foam | ||||||||||
| 0.05" | 0.09" | 48" | 80 dB @ 1 GHz | Adhesive | -40° to 158° | Beige | No | UL 94 V-0 | 0000000 | 00000 |

| Thickness | Width | Length | Interference Reduction @ Frequency | Backing Type | Temperature Range, °F | Color | For Use Outdoors | Specifications Met | Each | |
Polyurethane Foam | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 0.05" | 1/4" | 48" | 80 dB @ 1 GHz | Adhesive | -40° to 158° | Beige | No | UL 94 V-0 | 0000000 | 000000 |
Oil-Resistant Buna-N Backup Rings


Made of Buna-N, these backup rings resist grease, petroleum fluids, and motor oil. Use them to extend the life of your O-rings and improve their performance in high-pressure applications.
For technical drawings and 3-D models, click on a part number.
| For Dash Number | ID | OD | Thick. | Hardness | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
0.118" Wide | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 202 | 0.265" | 0.501" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 00000 |
| 203 | 0.327" | 0.563" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 204 | 0.390" | 0.626" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 206 | 0.518" | 0.754" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 207 | 0.580" | 0.816" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 0000000 | 0000 |
| 208 | 0.643" | 0.879" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 210 | 0.766" | 1.002" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 211 | 0.828" | 1.064" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 212 | 0.891" | 1.127" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 214 | 1.016" | 1.252" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 216 | 1.141" | 1.377" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 217 | 1.203" | 1.439" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 0000000 | 0000 |
| 218 | 1.266" | 1.502" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 100 | 00000000 | 0000 |
| 220 | 1.397" | 1.633" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 00000000 | 0000 |
| 222 | 1.522" | 1.758" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 00000000 | 0000 |
| 223 | 1.647" | 1.833" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 00000000 | 0000 |
| 224 | 1.772" | 2.008" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 00000000 | 0000 |
| 225 | 1.897" | 2.133" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 00000000 | 0000 |
| 226 | 2.022" | 2.258" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 00000000 | 0000 |
| 227 | 2.147" | 2.383" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 0000000 | 0000 |
| 228 | 2.272" | 2.508" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 00000000 | 0000 |
| 229 | 2.397" | 2.633" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 00000000 | 00000 |
| 230 | 2.522" | 2.758" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 00000000 | 00000 |
| 231 | 2.631" | 2.867" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 00000000 | 00000 |
| 232 | 2.756" | 2.992" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 50 | 00000000 | 00000 |
| 233 | 2.881" | 3.117" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 0000 |
| 234 | 3.006" | 3.242" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 0000 |
| 235 | 3.131" | 3.367" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 0000 |
| 236 | 3.256" | 3.492" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 0000 |
| 237 | 3.381" | 3.617" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 0000000 | 0000 |
| 238 | 3.506" | 3.742" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 0000 |
| 239 | 3.631" | 3.867" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 00000 |
| 240 | 3.756" | 3.992" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 0000 |
| 241 | 3.881" | 4.117" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 00000 |
| 242 | 4.006" | 4.242" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 0000 |
| 243 | 4.131" | 4.367" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 00000 |
| 244 | 4.256" | 4.492" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 0000 |
| 245 | 4.381" | 4.617" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 00000 |
| 246 | 4.506" | 4.742" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 00000 |
| 247 | 4.631" | 4.867" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 0000000 | 00000 |
| 248 | 4.768" | 5.004" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 00000 |
| 249 | 4.893" | 5.129" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 25 | 00000000 | 00000 |
| 250 | 5.018" | 5.254" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 00000000 | 0000 |
| 252 | 5.268" | 5.504" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 00000000 | 0000 |
| 254 | 5.518" | 5.754" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 00000000 | 0000 |
| 255 | 5.643" | 5.879" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 00000000 | 0000 |
| 256 | 5.768" | 6.004" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 00000000 | 0000 |
| 257 | 5.893" | 6.129" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 0000000 | 0000 |
| 258 | 6.018" | 6.254" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 00000000 | 0000 |
| 259 | 6.268" | 6.504" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 00000000 | 0000 |
| 260 | 6.518" | 6.754" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 00000000 | 0000 |
| 261 | 6.768" | 7.004" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 00000000 | 0000 |
| 262 | 7.018" | 7.254" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 00000000 | 0000 |
| 265 | 7.768" | 8.004" | 0.05" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 00000000 | 00000 |
High-Temperature Felt

This Nomex aramid felt withstands temperatures three times as high as wool felt. It is chemical resistant and often used as insulation.
For technical drawings and 3-D models, click on a part number.

























