Amber Volumetric Flask, Unserialized, With PTFE Stopper CLASS A
Product Code : EL-VF-10259
Quick answer: This is a Class-A tolerance amber borosilicate volumetric flask with a chemically resistant PTFE stopper, supplied across 13 capacities from 1ml to 2000ml, each carrying its own stated tolerance and stopper size.
| Capacity (ml) | Tolerance (±ml) | Stopper Size (mm) |
|---|---|---|
| 1 | 0.01 | 8 |
| 2 | 0.01 | 8 |
| 5 | 0.02 | 9 |
| 5 | 0.08 | 13 |
| 10 | 0.02 | 9 |
| 10 | 0.08 | 13 |
| 20 | 0.03 | 9 |
| 20 | 0.08 | 13 |
| 25 | 0.03 | 9 |
| 25 | 0.08 | 13 |
| 50 | 0.05 | 9 |
| 50 | 0.08 | 13 |
| 100 | 0.08 | 13 |
| 100 | 0.10 | 16 |
| 200 | 0.10 | 16 |
| 200 | 0.20 | 19 |
| 250 | 0.12 | 16 |
| 250 | 0.20 | 19 |
| 500 | 0.20 | 19 |
| 1000 | 0.30 | 22 |
| 2000 | 0.50 | 27 |
Why This Flask Lists Two Tolerances at the Same Capacity
Several capacities in this range — 5ml through 250ml — are offered in two neck/stopper-size variants, and the tighter-tolerance option pairs with the smaller stopper size while the wider-tolerance option pairs with the larger one. Buyers who need the tightest achievable Class-A tolerance at a given capacity should specify the smaller stopper-size variant; buyers matching existing stoppers or accessories can choose the size already in use. The PTFE stopper itself resists a broad range of laboratory chemicals better than a polyethylene stopper, making this variant a common choice for aggressive reagents alongside its amber, light-protective glass.
Frequently Asked Questions
Why does this flask show two tolerance values for some capacities?
Several capacities are offered in two neck/stopper-size variants; the smaller stopper size pairs with the tighter tolerance.
What stopper material does this flask use?
It uses a PTFE stopper, which resists a broad range of laboratory chemicals.
What is the tightest tolerance available?
The 1ml and 2ml sizes carry the tightest tolerance at ±0.01ml.
Related Products
Explore more from the Volumetric Flasks range, including Amber Volumetric Flask, Unserialized, With Polyethylene Stopper Class A and Volumetric Flask With PTFE Stopper, Unserialized Class A.
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Last updated: September 2026.
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