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DELIVERY TIME UP TO 7 WORKING DAYS, UP TO 10 WORKING DAYS FOR PALLETS, NON-CONTACT COLLECTION SLOTS AVAILABLE, SHOWROOMS ARE OPEN. SEE NEWS PAGE FOR LATEST UPDATE.

Sodium Silicate 75tW 500gm

  • Sku - 346011
  • Out Of Stock

If this product is showing as out of stock, please contact us as there is a good chance we have it in bulk stock (drums) and it will just need packing down.

Sodium Silicate Na2SiO2 is the most popular deflocculant used in casting slips, and has been so for many years. It is nearly always used with sod…
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  • Description

    Sodium Silicate 75tW 500gm

    If this product is showing as out of stock, please contact us as there is a good chance we have it in bulk stock (drums) and it will just need packing down.

    • Sodium Silicate Na2SiO2 is the most popular deflocculant used in casting slips, and has been so for many years.
    • It is nearly always used with soda ash - when used alone it can make a slip stringy and thixotropic.
    • It is effective, reliable and inexpensive but attacks the plaster in moulds much more than more modern deflocculants and it is easier to over-deflocculate a slip with sodium silicate.
    • Sodium dispex (345921) is a possible alternative which avoids problems of brittle and soft casts associated with sodium silicate and soda ash.
    • As long as Sodium Silicate is not allowed to dry out, the shelf life is indefinite. If it does dry out and crystallises it can be redispersed in hot water but the dilution will need to be adjusted by trial and error.

    Which "Twaddle"?

    A degree Twaddle (�Tw) is a unit measuring the specific gravity of liquids denser than water. 1 degree Twaddle represents a difference in specific gravity of 0.005 or 1/200. The difference between the grades is the concentration of sodium silicate: 75Tw (346011) is like thin water and 140TW (346021) is similar consistency to treacle. Your recipe should specify which Twaddle to use but if it doesn't a general rule of thumb is 75Tw with Bone China and Terracotta, 140Tw with everything else. 140Tw differs in chemical composition to 75Tw so it cannot be 'watered down' and used as a direct replacement. 140TW can be thinned by gently warming to aid addition to slip.

    For further information please see our FAQ's section here>

  • Delivery & Returns

    Delivery & Returns

    Full information at this link>

    DELIVERY

    Your carriage charge will be calculated at checkout based upon the volumetric weight of your order, and your location. If for any reason your delivery charge cannot be calculated at checkout, you will see a message explaining that our sales team will contact you with a quote. You will be under no obligation to accept this and have the right to cancel your order. 

    We deliver throughout the UK and overseas using a trusted third-party distribution network. Delivery is to kerbside or letterbox only.

    Please allow up to 10 working days for standard pallet delivery, up to 7 working days for parcels/courier delivery. Our Nextday service is suspended. Collection from our Stoke-on-Trent warehouse is currently only possible by placing your order by phone +44(0)1782 219816. Although carriers will endeavour to deliver within the agreed timeframe, unexpected delays due to weather conditions, breakdowns, traffic and other factors may cause some disruption to schedules.


    IMPORTANT INFORMATION

    We are bound by the terms and conditions of our carriers therefore we cannot pursue a claim if these instructions are not followed:- 

    Special Delivery Conditions: You must inform us at point of order of any special conditions such as restricted access or opening times, otherwise you will be liable for any consequential costs incurred.

    Damage/Missing Items: You must check your delivery carefully before providing a ‘clear’ signature to the driver. Outward signs of damage/disruption to packaging must be noted alongside your signature. You must notify Potclays of damage or missing items within 24 hours of delivery.


    RETURNS

    Returned Goods (Non-faulty): Subject to our prior consent having been obtained, products can be returned to us in an unused condition within 30 days of invoice date.  An administrative charge will be levied of 10% of the nett value plus transport, but subject to a minimum charge of £ 2.00. 

    Returned Goods (Faulty): If merchandise is returned because of some defect or due to error on our part, full credit/refund will be given.  However, customers must contact us in advance so that making methods and user error can be ruled out. 

    Read more about returns >

If you have any questions contact us now

If you have any questions about our range of products, please do not hesitate to get in touch with Potclays. Our team of experts will be more than happy to answer any questions you may have.

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