National Scientific
11mm Silver Aluminum Seals With Septa
| Type | Description | Recommended Use |
| PTFE/Red Rubber | Highest quality, medium durometer red rubber with a thin (0.015") layer of clear PTFE. Offers moderate resealability and excellent chemical inertness. Not recommended for multiple injections or holding samples for further analysis.. | Used primarily for routine analysis. Most economical and should be the first choice if unsure of requirements. |
| PTFE/ Silicone/ PTFE | A layer of 0.003" red PTFE on each side of medium durometer white silicone. Most resistant to coring with above average resealability. | Recommended for use in most demanding applications such as trace analysis, longer time between injections or for internal standards. Use with Agilent (hp) 1050, 1090, 1100, Gilson, LCD Marathon, Varian Marathon and any other autosampler using large diamet |
| Polypropylene | Chemically-resistant polypropylene is 0.010" thick and easily penetrated by syringe needles. | For one time use only and not resealable. |
| PTFE/Silicone | High-quality, pure silicone laminated to 0.005" tan PTFE. Resists coring. | Use when excellent resealing qualities are necessary. Recommended for multiple injections. |
| Viton® | Viton provides the best chemical resistance with limited resealability. Due to Viton's intrinsic hardness, these septa are not suitable for 32-guage syringe needles. | Recommended for chlorinated solvents. |
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