Corning Pyrex 5635-25 Borosilicate Glass 25mL +/- 0.03mL Flat Bottom EZ Access Wide Mouth
- 25 mL capacity, +/- 0.03 mL tolerance
- Class A, borosilicate glass 7740
- Pack of 6 with glass standard taper stoppers
- EZ Access wide mouth, flat bottom
- About 100 mm tall, 40 mm outer diameter
Updated 2 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
Class A twenty-five milliliter volumetric flasks with a wide mouth and glass stoppers in a pack of six. They suit microchemical work, and the listing conflicts on bottom shape.
As an Amazon Associate I earn from qualifying purchases. ProductDome earns a commission when you buy through links on this page.
ASIN: B004DGIEFKModel: COR-5635-25Category: Volumetric Flasks
Overview
Filling and mixing is eased by the wide mouth on this Corning Pyrex volumetric flask, which also has a flat bottom and a long neck. A permanent sharp graduation line marks the volume, and a glass standard taper stopper closes it.
The reason to buy is tight tolerance at a small volume, designed for microchemical work, with a wider opening than a standard volumetric flask. The limitation is the tiny capacity, and conflicting bottom shape and weight details in the listing.
Who it's for
Microchemical and analytical work where accuracy matters in tiny quantities. Labs that need larger standards or general mixing should choose bigger flasks.
Pros and cons
- Sharp graduation line
- Very small capacity
- Bottom shape conflicts
- Stopper size not stated
- Not for heating
Performance notes
The tolerance is tighter than on the larger flask in the same family, so the volume uncertainty is smaller in absolute terms. The sharp graduation line and long neck make the meniscus easy to set against the mark.
Specifications
| Model | COR-5635-25 |
|---|---|
| Dimensions & fit | |
| Dimensions D x W x H | 1.57 inches deep x 1.57 inches wide x 3.94 inches tall |
| Item weight | 0.02 kg |
| Capacity & performance | |
| Capacity | 25 ml |
| Construction & materials | |
| Material | Borosilicate Glass |
| Included components | |
| Stopper | Glass standard taper stopper |
| Other details | |
| Tolerance | +/- 0.03 mL |
| Accuracy class | A |
| Shape | Flat Bottom |
| Pack quantity | 6 |
| Part number | 5635-25 |
Frequently asked questions
Does the 5635-25 use a standard taper stopper?
Yes, a glass standard taper stopper is included. The listing does not give the taper size, so check it if you use other stoppers.
How accurate is the Pyrex 5635-25 flask?
It is Class A with a tolerance of +/- 0.03 mL at 25 mL.
How many flasks are in the pack?
The title and specs say 6.