Higher temperature does not relate to higher quality when discussing GC septa.· To make septa with a higher temperature, they need to be stiffer. This makes them harder to puncture, resulting in shorter life.· GC users typically do not use an injection port temperature above 350 °C. We choose to make softer septa that result in easier penetration, less coring, and long life.
29452-U
Molded Thermogreen® LB-2 Septa, with injection hole
diam. 17 mm, pkg of 50 ea
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About This Item
UNSPSC Code:
12000000
NACRES:
SB.54
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packaging
pkg of 50 ea
diam.
17 mm
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General description
The Perfect Combination of Low Bleed, Thermal Stability, and Easy Puncturability!
Molded Thermogreen LB-2 septa are manufactured from high quality, low bleed material using the same exclusive LB-2 rubber formulation that chromatographers are accustomed to using. The difference is that molded septa, unlike traditional die-cut septa, offer easier installation and better sealing inside the injection port. This is because our liquid injection molding process ensures that every septum conforms to the same shape with crisp, clean sides. This is an improvement over a die-cutting process where septa can become cupped and/or distorted when the cutting surface becomes dull.
The useable inlet temperature range of 100-350 °C is adequate for most GC applications. Don′t be fooled by other septa that advertise a maximum temperature of 400 °C! Tto make septa with high thermal limits, they must be made stiffer, resulting in septa that are harder to pierce and easier to core! Our molded Thermogreen LB-2 septa offer the perfect combination of low bleed, thermal stability, and easy puncturability.
Molded Thermogreen LB-2 septa are manufactured from high quality, low bleed material using the same exclusive LB-2 rubber formulation that chromatographers are accustomed to using. The difference is that molded septa, unlike traditional die-cut septa, offer easier installation and better sealing inside the injection port. This is because our liquid injection molding process ensures that every septum conforms to the same shape with crisp, clean sides. This is an improvement over a die-cutting process where septa can become cupped and/or distorted when the cutting surface becomes dull.
The useable inlet temperature range of 100-350 °C is adequate for most GC applications. Don′t be fooled by other septa that advertise a maximum temperature of 400 °C! Tto make septa with high thermal limits, they must be made stiffer, resulting in septa that are harder to pierce and easier to core! Our molded Thermogreen LB-2 septa offer the perfect combination of low bleed, thermal stability, and easy puncturability.
- Rubber formulation exclusive to Supelco
- Strict tolerances (diameter, thickness, injection hole) due to constant dimension of the mold itself
- Ultra low bleed over a wide range of inlet temperatures (100 °C to 350 °C)
- No foreign substances/powders (which could contaminate the inlet) are used during manufacturing
- Fully tested for bleed and contamination
- Already conditioned, ready to use
- Ideal for use with low bleed GC-MS columns
Other Notes
The injection hole helps guide the syringe needle to puncture the same location every injection, resulting in two benefits:
- Minimal coring leading to long life
- Less septum fragments that contaminate the inlet liner
Legal Information
Thermogreen is a registered trademark of Merck KGaA, Darmstadt, Germany
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I see the Molded Thermogreen™ LB-2 Septa have a maximum temperature of 350 °C, whereas some septa from other manufacturers list 400 °C. Why would I want septa with a lower maximum temperature?
1 answer-
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What are the benefits of Molded Thermogreen™ LB-2 Septa over die-cut septa?
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Every septum conforms to the same mold shape with crisp, clean sides, resulting in easier installation and better sealing.
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What is the Department of Transportation shipping information for this product?
1 answer-
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
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What are the benefits of molded Thermogreen LB-2 septa over other molded septa?
1 answer-
These septa have several benefits.· The exclusive rubber formulation provides ultra low bleed over a wide range of inlet temperatures (100 °C to 350 °C).· No foreign substances or powders (which could contaminate the inlet) are used during manufacturing.· All septa are fully tested for bleed and contamination.· All septa are pre-conditioned, therefore, they are ready to use.· They are ideal for use with low bleed GC-MS columns.
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I see two versions of Molded Thermogreen™ LB-2 Septa are offered. How do I know which version to use for my application?
1 answer-
The versions are designed as follows:· The version with an injection hole is designed for customers who use autosamplers. This version is also suited for users of solid phase microextraction (SPME).o A dimpled center guides the needle through the septa.o Allows needle penetration through the same location, time after time.o Reduces septum coring, preventing septum fragments from entering the injection port.o Have a high puncture tolerance and long life.· The version without an injection hole is designed for customers who do not use autosamplers.
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Would you recommend molded Thermogreen LB-2 septa for all applications?
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Yes. These are superior in all areas to die-cut septa as well as molded septa from other manufacturers.
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