EXTRACTION THIMBLES
They are used forreliable and fast analysis in the pharmaceuticalformulations, food controls and environmental monitoring.
The extraction thimbles are suitable for Soxhlet-type, Tecator type or similar devices.
They are located in the extractor body, used to accommodate a sample of solid material to extract certain components out, with the addition of an appropriate solvent.
Applications
GVS extraction thimbles are manufactured in three versions:
1. High purity cellulose
2. Pure borosilicate glass microfiber
3. High purity quartz microfiber
[Cellulose extraction thimbles]
GVS high quality Cellulose Extraction Thimbles are made from high-alpha cellulose cotton linters with rounded bottom.
Their main features of high purity and the strong mechanical structure and retentivity offer a special combination of advantages to the laboratory user. Indicated for fat extraction in food industry, extraction of polymers, environmental pollutants determination, etc.
Maximum working temperature 120ºC.
They are usually used in extractors of the “Soxhlet”, “Tecator” or similar types, in order to collect solid material from which some component must be separated out by dissolving in a suitable solvent.
The thimbles size selection should be done carefully to fit extractors correctly. The references sizes are internal diameter and the length in mm (an extra allowance for wall thickness should be added when selecting external diameters).
Tolerances according to DIN 12449:
Internal diameter +0/-3mm
Thimble height ±1mm
Wall thickness 1.5 ±0.5mm
Ash content < 0.1%
[Glass micro fiber thimbles]
GVS high quality glass microfiber thimbles are made from 100% pure borosilicate fibers. They have special advantages since no binders of any kind are used in their manufacture process.
They are particularly suitable when solvents that are incompatible with cellulose thimbles are present. They are widely used for gasemission controls for industrial chimneys, for gas pre-filtration upstream of measuring apparatus, for gravimetric testing for dust in hot gases, etc. Maximum operating temperature for glass microfiber 500ºC.
They have all the associated properties (high loading capacity, high retention of very small particles, high air permeability and good stability at high temperatures) and the same limitation when working with highly concentrated acid or alkaline solutions, for which the use of GVS micro-quartz extraction thimbles is recommended.
Tolerances for glass microfiber thimbles:
Internal diameter +1/-3mm
Thimble height ±1mm
Wall thickness 2 ±0.5mm
TECHNICAL SPECIFICATIONS
| GRADE | PENETRATION % (0.3 µm) | MAXIMUM TEMPERATURE (ºC) | BINDER |
|---|---|---|---|
| Glass Fiber Thimbles | < 0.002 | 500 | NO |
[Quartz micro fiber thimbles]
GVS thimbles are made from high purityquartz microfiber.These thimbles are able towithstand high temperatures (up to 900°C), and meet the highest requirements for purity, especially because of their low heavy metal content
Suitable for both solvent extraction and air sampling applications.
Tolerances for micro-quartz extraction thimbles:
Internal diameter +0/-3mm
Thimble height ±1mm
Wall thickness 2 ±0.5m
TECHNICAL SPECIFICATIONS
| GRADE | PENETRATION % (0.3 µm) | MAXIMUM TEMPERATURE (ºC) |
|---|---|---|
| Quartz Microfiber Thimbles | < 0.002 | 900 |
