Ashirwad Chemicals

Shreenath Nagar, Junagadh, Gujarat

We are the largest manufacturers of silica gel in india, manufacturing as per is:3401. Our quality of silica gel are superior in india.

In this type all the gel particles are impregnated with an indicator. When free from moisture the crystals of silica gel are blue. As they are put to use, the crystals can take up moisture, it gradually turns pink and gives a ready indication that done its work and need replacement or regeneration. Applications

• In transformer breather
• Power Industries
• Purification of gas, air
• Refrigeration
• Catalyst Carrier

In this type all the gel particles are impregnated with an indicator. When free from moisture the crystals of silica gel are blue. As they are put to use, the crystals can take up moisture, it gradually turns pink and gives a ready indication that done its work and need replacement or regeneration. applications

• in transformer breather
• power industries
• purification of gas, air
• refrigeration
• catalyst carrier
• .

Silica Gel Sachets or bags, are simply flexible 'containers ' of silica gel. The sachet material has to be robust and capable of withstanding normal handling whilst importantly being able to breathe. This means that water molecules can pass through the material and be adsorbed by the silica gel. Standard sachet materials are tea-bag paper, fabric, cotton or Tyvek. Some sachets have heat-sealed seams, others are sewn. We produce a range of standard size silica gel sachets using non-indicating (white) or self-indicating (orange/green, orange/colourless or blue) silica gel. In the latter case, the colours of the gel are visible through the sachet paper or fabric. Self-indicating silica gel sachets are often useful in test situations, to confirm the suitability of the sachet size chosen, or in cases where an item is frequently inspected and the sachet can be replaced if it has become exhausted. Sachets are manufactured as standard in a heat-sealed non-woven fabric made froma 100% viscose fibre with an acrylic binder and polyamide coating. All sachets are printed with Desiccant Silica Gel Do Not Eat Which Size Sachet To Use?Silica Gel Sachet is always more effective in an enclosed environment. A physical barrier will discourage water vapour from continually entering such an environment, leaving the finite volume enclosed to be protected by the silica gel. A general rule of thumb in a 'hermetically sealed' environment, is that 5 grams of silica gel are required per cubic foot of enclosed volume (or 170 grams per cubic meter). It is often prudent to err on the side of caution and use the nearest standard size sachet over the amount of silica gel that is theoretically required. For large volumes, using a few well spaced smaller sachets will reduce humidity levels faster than if using a single large sachet.Often, environments cannot be considered 'hermetically sealed', there will be a number of factors which will increase the amount of silica gel that is needed. ApplicationsSmall silica gel sachets ( 0.5 to 10 gram)can prevent moisture damage to electrical goods and electronic components (internally and externally), scientific and optical instruments, communication equipment, metallic parts, leather goods, tools and many other small to medium sized items in use, store or transit.Medium sized silica gel sachets (20 to 500 gram) can prevent moisture damage to larger electrical/ electronic items, metallic components and fabrications, contents of export packing cartons or crates and hygroscopic powders.Large silica gel sachets (1 kg. to 5 kg.) can prevent moisture damage to items in transit in packing crates and shipping containers, large machinery and enclosed vessels such as tanks or pipes Sachets SizeWe offer various sachet ranges in heat-sealed non-woven fabric and in cloth fabric as below: Grams : 0.5, 1, 2, 3, 5, 10, 15, 20, 25, 40, 50, 100, 250, 500 gram. & 1, 2, 2.5, 4, 5 kg.

We offer chromatography grade silica gel. Chromatography grade silica gel column chromatography technique in column chromatography, the stationary phase, a solid adsorbent, is placed in a vertical glass (usually) column and the mobile phase, a liquid, is added to the top and flows down through the column (by either gravity or external pressure). Column chromatography is generally used as a purification technique: it isolates desired compounds from a mixture. The mixture to be analyzed by column chromatography is applied to the top of the column. The liquid solvent (the eluent) is passed through the column by gravity or by the application of air pressure. An equilibrium is established between the solute adsorbed on the adsorbent and the eluting solvent flowing down through the column. Because the different components in the mixture have different interactions with the stationary and mobile phases, they will be carried along with the mobile phase to varying degrees and a separation will be achieved. The individual components, or elutants, are collected as the solvent drips from the bottom of the column. Ever since the birth of modern liquid chromatography in the late 1960’s, silica has been the media of choice for the cinematographer. No other media gives cleaner separations or bonds better than silica. No other media offers a broader range of porosity and particle size choices. For more than 30 years, we have used our silica gel technology to provide consistent high-quality media for chromatographic separations. Ashirwad’s column chromatography grade silica gel are available in a wide variety of pore size and particle size distributions with excellent mechanical and structural properties. We offer unmatched capacity for meeting your requirements, from grams to tons. Since we are silica specialists, we also offer an unmatched ability to customize our silica media for your needs. The mixture to be analyzed by column chromatography is applied to the top of the column. The liquid solvent (the fluent)is passed through the column by gravity or by the application of air pressure. An equilibrium is established between the solute adsorbed on the adsorbent and the eluting solvent flowing down through the column. Because the different components in the mixture have different interactions with the stationary and mobile phases, they will be carried along with the mobile phase to varying degrees and a separation will be achieved. The individual components, or pollutants, are collected as the solvent drips from the bottom of the column. Particle size : we offer various particle size ranges as below: in mesh size : 30-60, 60-120, 120-200, 200-400, 60-130, 130-200, 130-230, 130-400, 230-400 mesh. Packing: 25, 40, 50 kg in cardboard barrel or iron or in h.d.p.e. Drum.

In column chromatography, the stationary phase, a solid adsorbent, is placed in a vertical glass (usually) column and the mobile phase, a liquid, is added to the top and flows down through the column (by either gravity or external pressure). Column chromatography is generally used as a purification technique: it isolates desired compounds from a mixture. The mixture to be analyzed by column chromatography is applied to the top of the column. The liquid solvent (the eluent) is passed through the column by gravity or by the application of air pressure. An equilibrium is established between the solute adsorbed on the adsorbent and the eluting solvent flowing down through the column. Because the different components in the mixture have different interactions with the stationary and mobile phases, they will be carried along with the mobile phase to varying degrees and a separation will be achieved. The individual components, or elutants, are collected as the solvent drips from the bottom of the column. Column chromatography is separated into two categories, depending on how the solvent flows down the column. If the solvent is allowed to flow down the column by gravity, or percolation, it is called gravity column chromatography. If the solvent is forced down the column by positive air pressure, it is called flash chromatography, a "state of the art" method currently used in organic chemistry research laboratories. The AdsorbentSilica gel (SiO2) and alumina (Al2O3) are two adsorbents commonly used for column chromatography. These adsorbents are sold in different mesh sizes, as indicated by a number on the bottle label: silica gel 60-120 or silica gel 230-400 are examples. This number refers to the mesh of the sieve used to size the silica, specifically, the number of holes in the mesh or sieve through which the crude silica particle mixture is passed in the manufacturing process. If there are more holes per unit area, those holes are smaller, thus allowing only smaller silica particles go through the sieve. The relationship is: the larger the mesh size, the smaller the adsorbent particles. Adsorbent particle size affects how the solvent flows through the column. Smaller particles (higher mesh values) are used for flash chromatography, larger particles (lower mesh values) are used for gravity chromatography. For example, 60230 silica gel is used for gravity columns and 230400 mesh for flash columns. Results were less than acceptable when large 60-200 mesh material was used, but remarkably improved when a 200-400 mesh material was in the column. Equally important: particle sizes less than 40 microns offered no significant improvement in resolution in this system. The SolventThe polarity of the solvent which is passed through the column affects the relative rates at which compounds move through the column. Polar solvents can more effectively compete with the polar molecules of a mixture for the polar sites on the adsorbent surface and will also better solvate the polar constituents. Consequently, a highly polar solvent will move even highly polar molecules rapidly through the column. If a solvent is too polar, movement becomes too rapid, and little or no separation of the components of a mixture will result. If a solvent is not polar enough, no compounds will elute from the column. Proper choice of an eluting solvent is thus crucial to the successful application of column chromatography as a separation technique. Often a series of increasingly polar solvent systems are used to elute a column. A non-polar solvent is first used to elute a less-polar compound. Once the less-polar compound is off the column, a more-polar solvent is added to the column to elute the more-polar compound. Column Chromatography ProcedureColumn Chromatography Grade Silica Gel

• Use a piece of wire to add a plug of cotton to the bottom of the column. There should be just enough cotton that the sand and silica will not fall out of the column.
• Clamp the column to a ring stand and add enough sand to fill the curved portion of the column.
• Place a pinch clamp on the tubing, then fill the column 1/4 to 1/3 full with the initial eluent.
• Prepare a slurry of silica in the initial eluent by pouring dry silica into a beaker of eluent. (Add a volume of silica gel, such as 20 mL, to approximately double the volume of eluent, 40 mL.) CAUTION: keep the dry silica in your hood and be careful not to inhale the lightweight substance. A picture of packed column given below.
• Quickly but carefully pour the slurry into the column. Stir and pour immediately to maximize the amount of silica that goes into the column instead of remaining behind in the beaker. You may find a clean spatula or glass rod helpful in transferring the silica.
• Remove the pinch clamp toallow solvent to drip into a clean flask. Tap on the side of the column with a rubber stopper or tubing to help the silica settle uniformly.
• Use a Pasteur pipet to rinse any silica that is sticking to the sides of the column. Allow the silica to settle while eluent continues to drip into the flask.
• Once the silica has settled, carefully add sand to the top of the column. Sand is heavier than silica. If the silica has not settled, the sand may sink into the silica instead of forming a layer on top of it. (You may need to rinse down sand that sticks to the side of the column.
• Drain eluent from the column until no solvent remains above the surface of the sand.
• Using a long Pasteur pipet, carefully add your sample to the column.
• Drain eluent from the column until no sample remains above the surface of the sand.
• Use 1 mL of eluent to rinse your container and pipet. Add this milliliter of sample to the sand. Drain eluent from the column until no liquid remains above the surface of the sand.
• Repeat step 12 two or three times to completely transfer your sample onto the silica gel. If you do not do and repeat step 12, your sample will remain in the sand instead of on the silica. Sample remaining in the sand will dissolve in the eluent that you add in step 14, ruining the possibility of good separation of components.

Eluting the sampleOnce you have rinsed your sample onto the silica, carefully add eluent to the top of the column. To avoid disturbing the top of the column, it's a good idea to carefully pipet an inch or two of solvent onto the column instead of pouring solvent directly onto the sand. 15. Add more eluent as necessary. The eluent collected prior to the elution of sample can be recycled. The composition of the eluent can be changed as the column progresses. If the eluent composition is to be changed, ALWAYS start with least polar solvent/mixture and change to the more polar solvent/mixture. Analyzing the fractionsAnalyze the fractions by thin-layer chromatography to determine a) if the fraction contains more than one component and b) if fractions can be combined without affecting the purity of those fractions. We offer various particle size ranges as below In mesh size : 30-60, 60-120, 120-200, 200-400, 60-130, 130-200, 130-230, 130-400, 230-400 mesh.

We are offering non indicating silica gel. non indicating silica gels(white) will adsorb moisture in exactly the same way as -indicating (blue) silica gel, but they will not indicate when they are becoming saturated by changing their color. it will remain white when they are becoming saturated. this is useful in fillers, catalysts supports, adsorbent, dehydrating agent and as the buffing media in toothpaste. particle size : in mesh size : 12, 34, 36, 38, 58, 916, 1630, 3060 mesh in mm : 10-20, 8-10, 6-10, 4-10, 6-8, 4-8, 3-8, 4 -6, 3-5, 2-5, 1.5-2, 1-2, 1-1.5 mm. packing: 25kg in bag, 25, 40, 50 kg in cardboard barrel or iron or in h.d.p.e. drum; 12.5kg in iron drum; 500kg in container bag.

In Non Indicating Silica Gel no indicator used during manufacturing process.Non-indicating silica gel will adsorb moisture in exactly the same way as -indicating (Blue) silica gel, but they will Not indicate when they are becoming saturated by changing their color. Means it will remain white when they are becoming saturated. Silica gel white (non indicating silica gel) is one of the oldest and most popular desiccant and adsorbent used for a wide number of industrial and consumer applications. Applications

• De-humidification process,
• Air & gas drying.
• Fillers in tooth paste, paints, ink, pigment etc.
• Catalysts supports,
• Drying & storage of flowers
• To protect materials or equipments from moisture during transportation.

We are the largest manufacturers of silica gel in india, manufacturing as per is:3401. Our quality of silica gel are superior in india.

we are india's largest manufacturer of silica gel. Self-indicating silica gel will adsorb moisture in exactly the same way as standard non-indicating (white) silica gel, but they will literally indicate when they are becoming saturated by changing their color. silica gel bluein this type all the gel particles are impregnated with an indicator. When free from moisture the crystals of silica gel are blue. as they are put to use, the crystals can take up moisture, it gradually turns pink and gives a ready indication that done its work and need replacement or regeneration. description silica gel blue (indicating type) shape sizesirregular assay (as sio2)min 97% loss on drying %less than 3 % adsorption capacity @ 95% humidity 30 wt % min. bulk density (gml) 0.65 - 0.75 ph (in 10 % aqueous solution) 5 - 8 friability 99.5 chloride (as nacl) max 0.5% cobalt chloride (ascocl2) 0.5 % min. sulfates (na2so4) max 0.5%.