Septa

We offer a wide range of serrated and non-serrated natural rubber and silicone rubber septa and sleeve stoppers for use as temporary closures for glassware joints and tubes, bottles, NMR tubes, ampules, and cannulation techniques in air-sensitive chemistry. After piercing the septum with a non-coring needle, the rubber closes the puncture, providing an air and moisture-tight seal to protect the contents of the vessel or container from the atmosphere.

Use the information in this guide to choose the best septum for your application. Click the product number links to see current price and stock availability (you must be registered and logged in to our Web site to obtain all this information).

SEPTA COMPARISON TABLE

	Precision Seal Septa	Suba-Seal Septa	Natural Rubber Septa (Sleeve Stopper)
Applications	For use with organic solvents, pressure applications, and cannulation techniques in air-sensitive chemistry; has medium density, low-extractables rubber formulation, precision fit plug provides a superior seal within glassware joints and tubes.	For general-purpose applications with mild organic solvents and aqueous solutions, low-density rubber, serrated plug provides a superior seal within bottles and tubes, available in silicone rubber for high-temperature use, autoclavable. Wide color range.	For general-purpose applications with mild organic solvents and aqueous solutions, low-density rubber, offers dimensional alternatives to above septa.
Rubber Type	Natural	Natural & Silicone	Natural
Color	White and Red	White, Red,Green, Gray and Blue	White and Red
Rubber Finish	Flat-resists movement once seated	Natural-smooth, Silione-flat	Smooth-slippery when wet
Rubber Density (Relative)	Medium	Low	Low
Extractables (Relative)	Low	Medium	Medium
C of A	Yes	No	No
Lot Controlled	Yes	No	No
Packaging Spec.	White room conditions	None	None
Plug Design	Long length, precision tapered	Long length, straight, serrated	Short/Med length, straight to slight taper
Plug Style	non-serrated	serrated	non-serrated
Mode of Seal	Compression, seals within joint or tube	Compression, seals within joint & on sleeve	Compression, seals top of joint & on sleeve
Sleeve	Long length, heavy-wall, resists deterioration; oversized on larger septa for safe turnover; Anchors septum to joint with Wrap-It Tie* Wrap-It Tie required for pressure applications and cannulation.	Long length, medium wall Anchors and seals septum to joint; Wrap-It Tie* required for pressure applications and cannulation.	Medium length and wall; Anchors and seals septum to joint; Wrap-It Tie* required for pressure applications and cannulation.
Resealability (puncture)	Excellent	Excellent	Excellent
Puncture target area	Large	Medium	Medium
Temperature range, deg C	85	Natural-85, Silicone-200	85
Autoclavable	No	Natural-No, Silicone-Yes	No
Resistance to Pop-off	Excellent-requires Wrap-It Tie on glass joints	Good with Wrap-It Tie on glass joints	Good with Wrap-It Tie on glass joints
Resistance to push-through	Excellent-tapered plug tightens in joint with pressure	Good-slides through with pressure	Fair-slides through with pressure
*Wrap-It Tie: a one-piece, self-locking, nylon closing tie that is required for use with all rubber septa to anchor to glass joints for pressure and cannulation applications.

RUBBER SEPTA DIMENSIONAL SPECIFICATIONS AND CROSS-REFERENCE

NOTES
	Dimensions are expressed in mm and are approximate
	DISCONTINUED- SELECT ALTERNATE SEPTA TYPE
	NEW LISTINGS - DIMENSIONALLY SIMILAR TO DISCONTINUED PRODUCT!

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