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Key Documents

Z512125

Sigma-Aldrich

Serrated natural rubber septa

white rubber, bottom O.D. 14.5 mm, fits neck I.D., 12.5 mm, ST/NS: 14/20

Synonym(s):

Natural rubber seal, Rubber septa

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100 μG
CN¥4,239.58

CN¥4,239.58

Estimated to ship onMay 06, 2025Details

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100 μG
CN¥4,239.58

About This Item

UNSPSC Code:
41121800
eCl@ss:
32119211
NACRES:
NB.35

CN¥4,239.58

Estimated to ship onMay 06, 2025Details

material

white rubber

usage

ST/NS: 14/20

feature

fits neck I.D. 12.5 mm

packaging

package of 100

bottom O.D.

14.5 mm

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Quality Level

200

Quality Level

200

Quality Level

100

Quality Level

-

density

1.075 g/mL at 20 °C, 1.042 g/mL at 25 °C (lit.)

density

1.042 g/mL at 25 °C (lit.)

density

-

density

1.042 g/mL at 25 °C (lit.)

bp

189 °C (lit.)

bp

189 °C (lit.)

bp

-

bp

189 °C (lit.)

refractive index

n20/D 1.449 (lit.), n20/D 1.450

refractive index

n20/D 1.449 (lit.)

refractive index

-

refractive index

n20/D 1.447-1.451, n20/D 1.449 (lit.)

form

liquid

form

liquid

form

solid

form

liquid

General description

Closure has a turnover flange molded to grip outside of container neck, promoting a double seal in conjunction with annular serrations on a hollow plug. Annular serrations depress themselves against the inside wall of the bottle neck, making each serration a suction sealing point.
Note: For extra security when using large bore transfer needles, fasten septum to bottle or flask opening with a wrap-it tie. See ties and accessory tool listings on next page.

Application

Serrated natural rubber septa are suitable as a temporary closure for glassware joints, tubes, bottles, nuclear magnetic resonance (NMR) tubes, ampules, and cannulation techniques in air-sensitive chemistry.

Features and Benefits

Natural rubber septa are:
  • made of low-density /US/ennatural rubber
  • used to cover mild organic solvents and aqueous solutions

    • Choose from one of the most recent versions:

    Certificates of Analysis (COA)

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