Flask Closures

Each with its own specific application and fit, a variety of closures are available for use with flasks. Most common flask closures include screw caps and snap caps. Flask closures are typically manufactured from autoclavable plastics such as polyethylene or polypropylene. A wide range of flask closure types are available to accommodate a broad range of laboratory applications and flask varieties, including closures that are sterile or non-sterile, disposable or reusable, and vented or unvented. Vented flask closures commonly include a 0.2 µm filter membrane to prevent contamination of flask contents. For applications that require a tight seal, screw caps with plug seals are available.

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Schuett Biotec™ Erlenmeyer-Cap™ Caps

Pricing and Availability

Lenz Laborglasinstrumente™ Flat Flange Lid with Center Neck and Two Angled Side Necks

Pricing and Availability
Specifications

Product Type	Flange lid
Material	Borosilicate Glass,Duran Glass
For Use With (Application)	Reaction vessels

Corning™ Universal CellSTACK™ Caps

For filling, venting, and manipulation

Pricing and Availability

Corning™ PYREX™ GL45 Screw Cap with Plug Seal

Nonsterile, reusable caps

Pricing and Availability
Specifications

Disposable	Reusable
Product Type	Cap
For Use With (Equipment)	Graduated Erlenmeyer flasks and media bottles
Thread Size	GL 45
Autoclavable	Autoclavable
Sterility	Non-sterile

Thermo Scientific™ Sterilin™ Silicone Stoppers

Guarantee a tight, reliable seal for your glass and plastic flasks. Suitable for use in various applications.

Pricing and Availability
Specifications

Material	Silicone
Autoclavable	Autoclavable
Temperature Range (Metric)	-50°C to +200°C

Thermo Scientific™ Nalgene™ Vented HDPE Closures for Sterile Single Use Erlenmeyer Flasks

Ensure a sterile gas exchange for shaker and suspension cell culture by using Thermo Scientific™ Nalgene™ Vented HDPE Closures for Sterile Single Use Erlenmeyer Flasks.

Pricing and Availability
Specifications

Color	Blue
No. per Case	12
Material	HDPE
No. per Pack	1
Closure Type	Vented
Sterility	Sterile

PYREX™ Polypropylene Caps for Erlenmeyer Flasks

As supplied with Pyrex™ Brand Media/Solution bottles. Choose orange caps for temperatures to 140°C (284°F), red caps for temperatures to 180°C (356°F).

Pricing and Availability
Specifications

Disposable	Single-use
Product Type	Cap
Temperature Range (English)	284°F
Closure Color	Orange
Temperature Range (Metric)	140°C
Sterility	Sterile
Closure Material	Polypropylene

Corning™ Universal CellSTACK™ Caps

For filling, venting, and manipulation

Pricing and Availability

Corning™ Direct Overhead Drive 120mm Center Cap Assembly

For use with Corning Reusable spinner flasks

Pricing and Availability
Specifications

Disposable	Reusable
Product Type	Center Cap Assembly
No. per Case	1/Cs.
No. per Pack	1/Pk.
Sterility	Non-sterile

Thermo Scientific™ Nunc™ Sterile Flask Replacement Filter Caps

Allow constant airflow and minimize chance of contamination by using individually packed Thermo Scientific™ Nunc™ Sterile Flask Replacement Filter Caps.

Pricing and Availability
Specifications

No. per Case	100
Closure Color	White
Closure Type	Filter
Sterility	Sterile

Corning™ Reusable Gas Venting Cap for Vertical Sidearm Flasks

Used to provide gases into larger spinner flasks with vertical sidearms during cell culture

Pricing and Availability

Thermo Scientific™ Caps for Nunclon™ Delta Flasks

Protect your valuable cell culture samples. These caps for Thermo Scientific™ Nunclon™ Delta Flasks are offered in two styles—vent/close, filter—to meet application needs.