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Prices are current as of Friday, 21/06/2019.
Prices are GST exclusive. Tax is added at checkout.

Availability: Backorder
Product Code: C81-005

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Silica gel is a desiccant (drying agent) with the capacity to absorb 27% of its weight in water within one day at 80% relative humidity. Bulk density is about 0.7 (70g/100mL). 2 to 4mm pellet size range, which equates ASTM mesh 8 to 10. Dry pellets are orange and turn dark green when near saturation. Heat applied to an open container holding silica gel - a hotplate or an oven at 110 deg. C, will restore silica gel to its previous moisture absorbing capability. Unlimited cycles are possible.

Silica gel is produced by the reaction of sulphuric acid with sodium silicate.
Orange silica gel does not contain cobalt, which is the indicator in blue silica gel. Silica gel has very low toxicity and ingesting or inhaling small amounts of silica gel dust is not harmful.

Silica gel does not dry completely below about 105 deg. C. The orange indicating dye may be damaged at temperatures above 125 deg. C. Higher temperatures also cause progressive collapse of the desiccant's fine adsorbent structures. ProSciTech recommends the refurbishing of silica gel between 105 and 120 deg. C for at least 2 hours, depending on depth of pellets.

Silica gel FAQs - Also contains a colour chart showing colour changes of orange silica gel with increasing hydration
Our price for the 25kg drum includes freight to any Australian destination, but GST is always additional.

For molecular sieve see C830


Orders with items in stock are packed within 24 hours. We ship with our best choice of courier, depending on goods ordered and shipping address provided.


Standard delivery

Express delivery


Next day



2-3 business days



4-10 business days

2-3 business days


6-14 business days

2-3 business days



5-14 business days

*Note: Delivery times are as provided by our carriers and are estimates only. Delays may occur during peak periods, and due to factors outside the carriers' control.

Standard shipping is $15 in Australia (free on orders over $200). Add $5 to ship Express (under 2kg only)


Order online and collect from our warehouse in Townsville.


Freight Charge

Ready for collection

11 Carlton Street, Kirwan


Once invoice has been emailed
(Less than 1 business day)

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