Sodium Silicate

Silica Gel (DMF Free)

To view the Certification for DMF Free (click here)

Indicating / Non Indicating Silica Gel

Silica Gel Sachets

Using Silica Gel

Bulk Packs

Allied Desiccant Products


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 indicating (orange/green, orange/colorless or blue) silica gels. In the latter case, the colours of the gels 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.

Stock sachets are as follows :

Sachets made in a heat-sealed non woven paper
Non-Indicating And Self-Indicating.

Small sachets are manufactured as standard in a plain paper made from a blend of top grade manila hemp, cellulose and thermoplastic fibres. All sachets are printed Silica Gel Do Not Eat.

½ GRAM 38 x 30 mm
1 GRAM 48 x 30 mm
3 GRAM 50 x 60 mm
5 GRAM 65 x 60 mm
10 GRAM 83 x 60 mm

Small silica gel sachets 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.

Sachets made in a heat-sealed non-woven fabric.
Non-Indicating and Indicating.

Medium sized sachets are manufactured as standard in a heat-sealed non-woven fabric made from a 100% viscose fibre with an acrylic binder and polyamide coating. All sachets are printed Silica Gel Do Not Eat and usually with their weight.

25 GRAM 110 x 80 mm
50 GRAM 130 x 80 mm
100 GRAM 165 x 80 mm
250 GRAM 200 X 125 mm
500 GRAM 240 X 125 mm

Medium sized silica gel sachets can prevent moisture damage to larger electrical/ electronic items, metallic components and fabrications, contents of export packing cartons or crates and hygroscopic powders.

Sachets made in a stitched non-woven fabric or cotton.
Non-Indicating and Indicating .

The 1kg sachet is stitched in a non-woven fabric made from a 100% viscose fibre with an acrylic binder. The 2.5 kg sachet is made as standard in cotton because of its large weight.
All sachets are printed Silica Gel Do Not Eat along with their weight.

1 KG
320 x 175 mm
2.5 KG 400 x 265 mm

Large silica gel sachets can prevent moisture damage to items in transit in packing crates and shipping containers, large machinery and enclosed vessels such as tanks or pipes.
         All sachet sizes are approximate

Sachets in Tyvek

We can make many different sized sachets using a TyvekTM material. This is a very strong dust and lint free material which is ideal for sensitive applications.

Which Size Sachet To Use?

A 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. Please read Using Silica Gel.

Non Standard Sizes And Special Sachets.

The above sachets represent our standard range of off-the-shelf items. In addition to this we are able to manufacture sachets to any other weight that meets customer requirements.
We will also manufacture totally non-standard silica gel sachets - sachets of specific (and unusual) shape, sachets with loops or lengths of tape attached, sachets with velcro, sachets in bandoliers or sachets that are individually over wrapped in foil or poly pouches. Finally, sachets can be made using a mixture of materials e.g. silica gel and activated carbon.

Pricing And Packing.

We try and sell sachets in almost any quantity that we are asked for. They are supplied in strong cartons with heavy gauge poly bags. If required,
packaging can be tailored to suit individual needs
In general, non-indicating silica gel sachets are cheaper than self-indicating sachets and to double the weight of silica gel does not double the cost. Prices are tiered, with price breaks as quantities increase. Often dramatic decreases in cost will accompany increased quantities. All quoted prices include delivery, there are no hidden charges

Please contact us for prices data sheets,samples or advice.

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