Worldwide Glass Resources, Inc. - Closures, Septa Materials

Technical Information: Cap Materials : Septa Materials

Septa Materials

Closure refers to the assembled combination of a cap and septa.  At this time, Worldwide Glass Resources offers only assembled closures; separate caps or septa are not available.

Worldwide Glass Resources offers closures with the following septa materials:

Material

Temperature Range

Sterilization

Compatibility

Incompatibility

Resealability

Notes

Polypropylene (PP)
(Used in molded caps wih a thinned penetration point, such as snap caps or snap plugs.)

Maximum Temperature Range is 0°C to 135°C.

Gas, disinfectants or autoclave are recommended.

acetone, ethyl acetate, methanol, isobutyl alcohol, methanol, and methyl ethyl ketone. 

cyclohexane, ethers, dichlorobenzene, pentanes, methylene chloride, and trichlorobenzene. 

For one time use only; not resealable.
Not recommended for lengthy sample storage before or after injection. 

PP is a rigid plastic that is translucent or may be tinted to provide colored material.

Polyethylene (PE)
(Used in molded caps wih a thinned penetration point, such as snap caps or snap plugs.)

Maximum temperature use is 120°C. 

Gas, radiation or disinfectants are recommended.

acids, alcohol, and bases.

benzene, chlorobenzene, acetic anhydride

For one time use only; not resealable.
Easily penetrated by syringe needles. 

PE is a flexible translucent plastic.

Polytetrafluoroethylene (PTFE)

Maximum temperature Range is -265°C to 250°C.

Autoclave, gas, dry heat and radiation may be used.

aliphatic hydrocarbons, aromatic hydrocarbons, alcohols, oil, gasoline, animal and vegetable oils, acids, and alkalies.

 

For one time use only; not resealable.
Not recommended for lengthy sample storage before or after injection. 

 

PTFE/Butyl and Molded PTFE/Butyl

Maximum Temperature Range is -40°C to 120°C.

 

alcohols, animal and vgetable oils, acids

aliphatic hydrocrabons, aromatic hydrocarbons, oil, gasoline

Good resealability.

Molded PTFE/Butyl varies from its PTFE/Butyl counterpart in that its PTFE lamination is limited to the center in order for the butyl to contact the glass rim and create a tight seal.

Note: Before puncturing, septa have chemical compatibility of PTFE; after puncturing, septa may have chemical compatibility of Butyl.

PTFE/Red Rubber

Temperature range: -40°C to 110°C.

 

ACN, Acetone, DMF, alcohols, Diethylamine, DMSO, Phenol

Chlorinated solvents, aromatics, hydrocarbons, carbon disulfide

Moderate resealability.
Not recommended for multiple injections or holding samples for future analysis. 

Most popular and economical choice for GC.  Used primarily for routine analysis in GC with FID, TCD and FPD detectors.

Note: Before puncturing, septa have chemical compatibility of PTFE; after puncturing, septa may have chemical compatibility of Red Rubber.

PTFE/Silicone

Temperature range -40°C to 200°C.

Autoclaveable. 

Alcohols, acetone, ether, DMF, DMSO

ACN, THF, chloroform, pyridine, benzene, toluene, hexane, heptanes

Resists coring.
Excellent resealability.
Highly recommended for multiple injections and sample storage.
May also be available pre-slit.

Ideal for use in most HPLC applications and GC applications where resealability and purity are critical.

Note: Before puncturing, septa have chemical compatibility of PTFE; after puncturing, septa may have chemical compatibility of Silicone.

PTFE/Silicone/PTFE

Temperature range -40°C to 200°C

Autoclaveable.

Alcohols, acetone, ether, DMF, DMSO

Chlorosilanes, ACN, THF, chloroform, pyridine, benzene, toluene, hexane, heptanes

Excellent resistance to coring.
Above average resealability.  Recommended for multiple injections. 

 

Note: Before puncturing, septa have chemical compatibility of PTFE; after puncturing, septa may have chemical compatibility of Silicone.

Aluminum Foil/Silicone

Maximum Temperature Range is -60°C to 220°C.

 

 

acetonitrile, benzene, chloroform, hexane, pyridine, tetrahydrofuran, toluene.

Very good resealability.

Used in sealing applications where non-permeability and low volatility are required; aluminum layer provides effective vapor barrier.

VitonTM
(Flouroelastomers):

Maximum Temperature is -23°C to 204°C.

Autoclave, microwave, dry heat, gas, radiation, and disinfectants may be used.

Chlorinated solvents, benzene, toluene, alcohols, hexane, heptane

DMF, DMSO, ACN, THF, pyridine
Dioxane, methanol, acetone

Very good resealability.