GeeJay Chemicals Ltd.




Silica Gel

Bulk Packs

Silica Gel Sachets

Allied Desiccant Products incl. Molecular Sieves

Using Silica Gel


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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 most 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 include Tyvek™, fabric, cotton or paper.
Some sachets have heat-sealed seams, others are sewn.

We produce a range of silica gel sachets using non-indicating (white)
or self-indicating (orange/green or orange/colourless) silica gels. In the latter
case, the colours are visible through the sachet fabric or paper.
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 (weights and physical dimensions) are as follows:

0.5 gram (34 x 18mm)
1 gram
(39 x 20mm)
3 gram
(55 x 30mm)
5 gram
(50 x 40mm)
10 gram
(75 x 40mm)
25 gram
(125 x 50mm)

Small non-indicating sachets are made as standard using a heat-sealed Tyvek™ material.
This is a very strong dust and lint free material which is ideal for sensitive applications.
A 0.5 gram non-indicating minisachet is also available at 21 x 18 mm.

The self-indicating (0.5, 1, 3 and 5 gram) sachets use a heat-sealed plain paper made
from a blend of top grade manila hemp, cellulose and thermoplastic fibres.
They vary in size from the non-indicating sachets being, respectively,
40 x 30mm, 50 x 30 mm,  50 x 50 mm and 65 x 50mm.
The 10 and 25 gram self-indicating sachets are made in a heat-sealed non-woven fabric (see below).
All sachets are printed Silica Gel Do Not Eat.

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.

For situations where the physical space for a sachet is very restricted,
silica gel in capsules: 0.3 gram, 0.6 gram and 1 gram.

Medium sized non-indicating sachets are manufactured as standard in Tyvek™.
Self-indicating sachets 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.

50 gram (130 x 80mm)
100 gram
(170 x 80mm)
250 gram
(185 x 125mm)
500 gram
(270 x 125mm)
1 kg
(320 x 160mm)

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.

The 2.5 kg sachet is made as standard in cotton to give it extra strength.
It has two 30cm tapes sewn into the seams of the sachet so can be tied to a suitable fixing point.
It is printed Silica Gel Do Not Eat 2.5 kg.

2.5 kg (400 x 265mm)

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.

Variations, 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. Also:

All standard sizes can be made in sewn non-woven fabric (or cotton) sachets where
regeneration and reuse of sachets is going to be important.
Totally non-standard silica gel sachets - sachets of specific weight or shape,
sachets with
loops or lengths of tape attached, sachets with Velcro, sachets in bandoliers
or sachets that are individually overwrapped in foil or poly pouches.
Sachets can be made using a mixture of materials
e.g. silica gel and molecular sieve or silica gel and activated carbon.

Which Size Sachet To Use?

A silica gel sachet is only effective in an enclosed environment. A physical barrier will prevent
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.

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 polybags.
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.
All quoted prices include delivery.