Argical M-1200S
A strong pozzolan, best suited to retain the features of colour-sensitive mortars. Available in 15kg bags.
£26.13 £31.36 inc VAT
Out of stock
Argical M1200S is a type of pozzolan known as metakaolin, produced by calcination and micronisation of a high-quality kaolinitic clay. Available in 15kg bags.
It offers a high pozzolanic index showing relatively potent and quick reactivity, making it quite a cost-effective addition.
For lime mortars, Argical chemically bonds very effectively with lime (calcium hydroxide). As a result, we would advise using it with caution in traditional lime mortars, as it can create excessively strong mortar unintentionally, which is problematic for the restoration and conservation of solid-walled buildings.
Volumetric batching should be done consistently with a measured quantity. Addition by eye or by shovel is strongly advised against.
- Made from a fired kaolinite clay
- White in colour
- A strong pozzolan suitable for small doses
- Ideal for colour-sensitive mortars
- Minimal impact on breathability
- Cost-effective option
Suitable for use with lime mortars, renders, cements and concretes.The addition rate in non-hydraulic lime mortars is advised at 5 to 10% by volume of the binder.
Pozzolans, such as metakaolin, should be used with care and only specified by experienced tradespeople who understand how they can affect the material’s performance and workability.
See the Technical Data and Documentation section for detailed product information, application guidance, and datasheets. Always review any available documents before use. Each project is unique, always seek professional advice before undertaking a project.
Often Used With
Brand
Argical
colour
Off-White
Work
Putty Mortar, Putty Render, Hot Mix Mortar, Hot Mix Render
Always read any available datasheets and documentation before use.
Stock Quantities and Lead Times
Stock quantities and lead times are estimated and may differ or increase based on the order size and shipping method. If your timeline is sensitive, get in touch with the team.
Palletforce
Pallet orders with Palletforce Economy are typically dispatched from Cornish Lime within 1-2 business days, providing your item is in stock and not made-to-order. Once dispatched, Palletforce will deliver your order within 3-5 business days, depending on your location. Please ensure that your site can accommodate articulated lorries or similar-sized vehicles.
Local Delivery
The Cornish Lime team provides local delivery with a 18-tonne vehicle with a crane to assist with unloading. You will be contacted by phone to arrange delivery and ensure your site can accommodate our vehicle.
APC Parcel Courier
Orders shipped by APC parcel courier are typically shipped the next business day and arrive within 2-3 business days, providing your item is in stock and not made-to-order. APC will contact you via email with delivery information, and orders can be tracked on the APC website.
Premium or Expedited Service
For a premium or expedited delivery service, please get in touch to discuss if this option is available for your order.
For further information, see our delivery information page.
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View ProductFAQs
Pozzolan dosage should be by volume of binder; so for every 15L of lime you use, you’d add 10%, or 1.5L of Argical M1200S. For our ready-mixed lime putty mortars, a 10% addition would be approximately 330ml per 25 kg bag of mortar.
While the answer is technically yes, we advise against it. The strength increase is magnified in combination with NHLs, so it’s a little too easy to make excessively strong mortars.
Whilst you can get a non-hydraulic mortar above the typical strength required for frost resistance, there are other considerations to be taken into account. During cold weather, carbonation slows significantly, increasing the risk of lime bleed when wind-driven rain or other moisture sources can penetrate the surface. So, whilst you can reduce the frost risk, it doesn’t solve all winter working issues.
At the same time as the sand. Ensure there is sufficient mixing to break down any clumps of powder, so semi-dry mortar mixing is recommended where possible.
The Argical M1200S has an open time, when mixed with lime, between 10 and 18 hours, although this is temperature dependent, with hotter temperatures setting faster. Once the set has started, it cannot be knocked back up, and any remaining mortar must be disposed of.
Argical is a fine powder with a moderate to high-water requirement. As a result, it can significantly stiffen a mortar when introduced into the mixer. While it might appear that the material is setting, it is simply stiffening and will require more water to reach a workable consistency.
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