Высококачественное биологическое пятно гематоксилин CAS 517-28-2
US $10.00-$300.00
Высокочистый силикагель размер пор 60 230-400 сетка 40-63 мкм для
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- Поставщик (Оптовый магазин): Qingdao,Hiland,Trading,Co.,Ltd.
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Характеристики
Spherical Chromatography Silica Gel
Porous silica remains nearly one hundred years the most often used sorbent in all chromatographic
separations. One of the reasons is its suitability of silica for surface modifications which allows to
produce new and new sorbents for range of applications. Among those the outstanding role of course
play reverse phases.
Product Description
Dessicant Silica Gel
(for MILITARY specification silica gel, please contact us)
The microporous structure of silica gel affords a high surface area (up to 800 m2/g) that is ideal for the scavenging of atmospheric moisture. Since there is no chemical reaction associated with the dehydration process, desiccated compounds are never exposed to harmful by-products or contaminants.
Silica gel is used widely as a laboratory desiccant for the following reasons:
- It can adsorb up to one third of its own weight in water vapour (this adsorption efficiency is approximately 36% greater than that of typical desiccant clays)
- It has an almost indefinite shelf-life if stored under airtight conditions
- Once saturated with water, silica can be regenerated by gentle heating
- With the exception of strong alkalis and hydrofluoric acid (HF), it is inert and resistant to attack or corrosion
- It is non-toxic, non-flammable and easy to handle
- It maintains the appearance of a dry product and its shape remains unchanged even when fully saturated with water
Standard white silica gel is referred to as being non-indicating. Self-indicating silica gels possess a chemical compound or dye that changes colour as moisture is adsorbed.
Our self-indicating desiccants are available in “blue to pink” and “orange to green or white” format. Please note that medium size granules (1 – 5 mm) are suitable for laboratory desiccants whilst larger granules (2 – 5 mm or 4 – 8 mm) are normally employed in dynamic adsorption processes.
Characteristics
Silica gel | Bulk density g/l | Pore volume ml/g | Pore size Å | Surface area m2/g | pH | Fe% | Cl-% | Moisture % |
Type A | 670 min | 0.35-0.45 | 20-30 | 600-800 | 4-8 | <0.03 | <0.03 | <1.5 |
Type B | 500-600 | 0.6-0.85 | 45-75 | 450-600 | 5-8 | <0.03 | <0.03 | <2 |
Type C | 400-550 | 0.7-1.0 | 80-100 | 300-500 | 5-8 | <0.03 | <0.03 | <3 |
Shape: Sphere/ Irregular Sizes(mm): 0.1-0.3; 0.2-1.0; 0.5-1; 0.5-2; 1-3; 1-4; 2-5; 3-7 | ||||||||
Adsorption Capacity
Item | Type A | Type B | Type C |
RH=10%,% ≥ | 6.0 | --- | --- |
RH=20%,% ≥ | 10.5 | 5.0 | --- |
RH=40%,% ≥ | 21.0 | ---- | --- |
RH=50%,% ≥ | 23.0 | 15.0 | --- |
RH=60%,% ≥ | 26.0 | ---- | --- |
RH=80%,% ≥ | 32.0 | ---- | --- |
RH=90%,% ≥ | 36.0 | 70.0 | RH=100%, 85min |
Their use in preparative chromatography brought new wave of interest in silica
chemical stability.
Spherical Silica Gels allow end users to go from analytical to prep to process with the same resin.spherical silica for use at any scale of high performance liquid chromatography (HPLC): from the smallest laboratory analytical analysis to the full-scale multi-ton production line, with the same efficiency all the way. We offer spherical silica gel with pore diameters ranging from 6nm to 30nm and particle sizes from 2um to 200um.
Characteristics
Spherical Silica gel type | 60 | 70 | 90 | 100 | 200 | 300 |
Nominal Pore Diameter, nm | 6 | 7 | 9 | 10 | 20 | 30 |
Specific Surface Area,m2/g | 480 | 450 | 390 | 280 | 150 | 120 |
Particle Sizes, u | 5, 10, 15, 20, 20,45-75; 75-200 | |||||
pH (5% suspension) | 5.5 | |||||
Specific Pore Volume, ml/g | 0.8-1.1 | |||||
Density, g/ml | 0.4 | |||||
Moisture, % | 2.0 | |||||
Chemical Analysis,SiO2 % | 99.5 | |||||
Fe2O3 | 0.01 | |||||
Na2O% | 0.02 | |||||
Al2O3% | 0.03 | |||||
CaO % | 0.02 | |||||
Irregular Chromatography Silica Gel
Characteristics
Spherical Silica gel type | 40 | 60 | 90 | 110 | 300 |
Pore diameter (nm) | 4 | 6 | 9 | 11 | 30 |
spec. Surface (m2/g) | 600 | 500 | 400 | 360 | 90 |
Pore volume (ml/g) | 0.6 | 0.8 | 0.9 | 1.0 | 0.7 |
Tapped bulk density (g/l) | 570 | 485 | 415 | 400 | 470 |
Average water content (%) | 2-4 | ||||
pH | 7 | ||||
Metal ion content Na/Ca/Fe/Pb (%) | 0.04;0.04,0.003;0.0001 | ||||
Silica Gel FIA
for the determination of the content of hydrocarbon groups in liquid fuels according to DIN 51791
for the determination of the content of hydrocarbon groups in liquid fuels according to DIN 51791
particle size | 0.071-0.16mm;0.071-0.63 mm;0. 063-0.2mm |
pH | 3.5-4.5 |
Boiling Point | 2230 °C |
Melting Point | >1600 °C |
