Volumetric Flasks – Technical Specifications
(Precision Liquid Measurement Vessels)
1. Material & Construction
-
Primary Material: Borosilicate glass 3.3 (e.g., Pyrex®)
-
Thermal shock resistant (ΔT ≤ 200°C)
-
Chemical resistance to acids/bases (except HF)
-
-
Stopper: Ground glass joint (NS 29/32 standard)
-
Markings: Permanent enamel graduation
2. Accuracy & Compliance
| Parameter | Class A Specification |
|---|---|
| Tolerance | ±0.08 mL (100 mL flask) |
| Calibration Temp | 20°C ± 0.5°C |
| Standards | DIN EN ISO 1042, ASTM E288 |
| Marking | Engraved “IN” (TC) & “A” grade |
3. Standard Capacities
| Volume | Neck Diameter | Uses |
|---|---|---|
| 50 mL | 14 mm | HPLC standards |
| 100 mL | 16 mm | Titrant prep |
| 250 mL | 22 mm | Molar solutions |
| 500 mL | 28 mm | Bulk reagents |
4. Key Features
✔ Single graduation mark for precise filling
✔ Hexagonal base for stability
✔ Traceable certification (NIST/DKD)
5. Usage Protocol
-
Cleaning: Chromic acid rinse → triple DI water wash
-
Filling: Meniscus tangent to mark (eye-level)
-
Mixing: 10× inversions (no shaking)
Do NOT heat when sealed – thermal expansion risks rupture
6. Quality Verification
-
Weight Test: Verify volume using distilled water (d=0.9982 g/mL at 20°C)
-
Documentation: Class A requires individual calibration certificate
7. Stop:
- It comes with a glass stopper to seal the contents.
8. Compliance:
- Class A volumetric flasks comply with international standards such as DIN EN ISO 1042 and DIN 12664.
Reviews
There are no reviews yet.