To formulate our products, we use sodium bromide to achieve a specific gravity of 1.4. Typically, this requires the preparation of a 40% (w/w) sodium bromide solution in deionised distilled water.
The addition of 0.02% (v/v) non-ionic detergent such as Polysorbate 20 (Tween 20) helps overcome any slight hydrophobic properties of the Palynospheres™, as does the inclusion of a wetting agent such as Polyvinylpyrrolidone (PVP) at 0.2% (w/v).
Adding 325mg of ‘Yellow’ Palynospheres™ to 1 litre of formulated carrier liquid produces a particle density of around 8500 grains per mL. ‘Orange’ Palynospheres™ (at the other end of the product size range) added added at 125mg per litre produces a particle density of around 20,000 grains per mL. These are typical of the particle densities in our SG06 product.
Customers can, of course formulate at higher or lower densities and with other grain sizes as they wish for their particular research requirements, but we simply provide the above information as a guideline for anyone wishing to prepare their own formulations using our Palynospheres™.