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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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1

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

EDGE
Product Type Flange lid
Material Borosilicate Glass,Duran Glass
For Use With (Application) Reaction vessels
2
Promotions Available

PYREX™ Polypropylene Caps for Erlenmeyer Flasks
BIOPHARMA GREENER_CHOICE

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).

Disposable Single-use
Product Type Cap
Temperature Range (English) 284°F
Closure Color Orange
Temperature Range (Metric) 140°C
Sterility Sterile
Closure Material Polypropylene
3

Corning™ Universal CellSTACK™ Caps
BIOPHARMA GREENER_CHOICE

For filling, venting, and manipulation

4
Promotions Available

PYREX™ Culture Flask Closure

For use with 1135 culture flasks, 1138/10 Fernbach flasks and 1141 baffled flasks.

No. per Pack 10
Autoclavable Autoclavable
6

Corning™ PYREX™ GL45 Screw Cap with Plug Seal

Nonsterile, reusable caps

Disposable Reusable
Product Type Cap
For Use With (Equipment) Graduated Erlenmeyer flasks and media bottles
Thread Size GL 45
Autoclavable Autoclavable
Sterility Non-sterile
7

Heinz Herenz Erlenmeyer Caps

Erlenmeyer cap without handles.

Disposable Reusable
Closure Size 38 mm
Product Type Cap without Handle
Diameter (Metric) Outer 38 mm
Closure Type Straight Rimless Neck
Autoclavable Autoclavable
Sterility Non-sterile
8

Corning™ PYREX™ Polypropylene Flask Closures

Designed for culture tubes and flasks with long rimless necks

Disposable Reusable
Product Type Cap, Flask
For Use With (Equipment) Culture tubes and flasks with long ri mLess necks
No. per Case 100/Cs.
No. per Pack 50/Pk.
Autoclavable Autoclavable
Sterility Non-sterile
Closure Material Polypropylene
9
Promotions Available

Thermo Scientific™ Sterilin™ Silicone Stoppers

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

Material Silicone
Autoclavable Autoclavable
Temperature Range (Metric) -50°C to +200°C
10

Corning™ Universal CellSTACK™ Caps
BIOPHARMA GREENER_CHOICE

For filling, venting, and manipulation

Disposable Single-use
Product Type Cap, Filling
Closure Color Orange
Sterility Sterile
Closure Material HDPE
Diameter (Metric) Outer Neck 3.3 cm
11
Promotions Available

Lenz Laborglasinstrumente™ Duran™ Flat Flange Lids with Three Angled Side Neck and One Vertical Side Neck

Product Type Flat Flange Lid
For Use With (Equipment) Reaction Vessels
Material Borosilicate Glass,Duran Glass
No. per Pack 1
Closure Type Flange Lid
12

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

Product Type Flange lid
Material Borosilicate Glass,Duran Glass
For Use With (Application) Reaction vessels
13

Thermo Scientific™ Nunc™ Sterile Flask Replacement Filter Caps
BIOPHARMA

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

No. per Case 100/Cs.
Closure Color White
Closure Type Filter
Sterility Sterile
14

Corning™ Universal CellSTACK™ Caps
BIOPHARMA GREENER_CHOICE

For filling, venting, and manipulation

15

Thermo Scientific™ Caps for Nunclon™ Delta Flasks
BIOPHARMA

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.

Surface Treatment Nunclon Delta
No. per Case 100
Material HDPE
No. per Pack 1
Closure Color Blue
Sterility Sterile