Corning Pyrex® #5640-1
- 1 mL test tube shaped volumetric flask
- Class A, ASTM E-694, E-542, E-288
- No. 8 Standard Taper glass stopper
- 0.35 x 0.35 x 3.11 inches, 0.02 kg
- Glass, round bottom
Updated 2 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A tiny test tube shaped Class A volumetric flask with a glass stopper for the smallest standard preparations. It is a single flask, so a series of these will mean a stack of orders.
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ASIN: B0741FXFY1Model: 5640-1Category: Volumetric Flasks
Overview
Corning makes this Pyrex volumetric flask in a test tube shape at a one milliliter size, with a machine-blown body and a heavy-tubing neck tooled for a standard taper stopper. The graduation line is sharp and permanent, with large white block lettering.
The test tube form suits microscale work where only a trace of solution is needed. The size is its limit, since the listing gives no use beyond precise volume measurement.
Who it's for
Microchemistry and analytical work that measures very small volumes accurately. Larger solution preparation needs a bigger flask.
Pros and cons
- Class A tolerance
- Test tube shape for micro work
- Permanent graduation line
- Glass stopper fitted to the neck
- Very small capacity
- Care steps not listed
- Stopper inclusion not stated clearly
Performance notes
The marked volume is reached when the meniscus meets the graduation line. At this size, surface tension and a clean interior affect accuracy more than they do in larger flasks.
Specifications
| Brand | Corning |
|---|---|
| Model | 5640-1 |
| Dimensions & fit | |
| Neck Taper | No. 8 Standard Taper glass stopper |
| Dimensions D x W x H | 0.35 x 0.35 x 3.11 inches |
| Item weight | 0.02 kg |
| Capacity & performance | |
| Capacity | 1 ml |
| Construction & materials | |
| Material | Glass |
| Other details | |
| Shape | Test tube |
| Bottom Shape | Round |
| Specification met | Class A, ASTM E-694, E-542, E-288 |
Frequently asked questions
How should I care for the Corning 5640-1 microflask?
The listing gives no cleaning steps. It says the graduation line is permanent and the body is machine-blown glass.
Which stopper fits the 5640-1?
The neck is tooled for No. 8 Standard Taper glass stoppers.
Is the 5640-1 a regular round flask?
No. It is a test tube shaped volumetric flask.