Corning Pyrex 5635-50 Borosilicate Glass 50mL +/- 0.05mL Flat Bottom EZ Access Wide Mouth
- 50 mL capacity, +/- 0.05 mL tolerance
- Class A, borosilicate glass 7740
- Pack of 6 with glass standard taper stoppers
- EZ Access wide mouth, flat bottom, long neck
- About 130 mm tall, 51 mm outer diameter
Updated 2 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
Class A fifty milliliter volumetric flasks with a wide mouth for easy filling, sold six to a pack with glass stoppers. They are for precise preparation, not for heating or bulk storage.
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ASIN: B004DGIEEGModel: COR-5635-50Category: Volumetric Flasks
Overview
Not a conical flask, this Corning Pyrex volumetric flask has a flat bottom, a long neck and a wide mouth that eases filling and mixing. Each comes with a glass standard taper stopper, and a sharp graduation line marks the volume.
The reason to buy is accuracy with convenience: Class A tolerance in a wide mouth design, designed for microchemical work. The limitation is that the listing contradicts itself on bottom shape, and a single flask is small for anything beyond microscale prep.
Who it's for
Analytical and teaching labs preparing accurate standards in small volumes. Users doing bulk mixing or heating should use Erlenmeyer or round bottom flasks instead.
Pros and cons
- Class A accuracy
- Wide mouth eases filling
- Permanent sharp graduation line
- Bottom shape conflicts in listing
- Stopper size not stated
- Not a heating flask
Performance notes
A single graduation line on a long neck sets the volume precisely, and the stated tolerance gives the uncertainty. The wide mouth makes it easy to add powder and liquid, and the stopper allows thorough mixing by inversion.
Specifications
| Model | COR-5635-50 |
|---|---|
| Dimensions & fit | |
| Dimensions D x W x H | 2.01 inches deep x 2.01 inches wide x 5.12 inches tall |
| Item weight | 0.02 kg |
| Capacity & performance | |
| Capacity | 50 ml |
| Construction & materials | |
| Material | Borosilicate Glass |
| Included components | |
| Stopper | Glass standard taper stopper |
| Other details | |
| Tolerance | +/- 0.05 mL |
| Accuracy class | A |
| Shape | Flat Bottom |
| Pack quantity | 6 |
| Part number | 5635-50 |
Frequently asked questions
What comes in the Pyrex 5635-50 pack?
A pack of 6 volumetric flasks, each with a glass standard taper stopper according to the title.
How accurate is the 5635-50 flask?
It is Accuracy Class A with a tolerance of +/- 0.05 mL at 50 mL.
Is this flask round bottom or flat bottom?
The title and description say flat bottom, while one spec field says round. The description lists flat bottom.