FLOPAM FO 4191 AR Equivalent: Cationic PAM Same-Type Screening Route

The factual basis for this page is a single historical document: SNF SAS Catalogue 2007 Poudres, page 18. The page lists FLOPAM FO 4191 AR as a cationic powder at Low charge density and Medium molecular weight on SNF's own scale, with approximate bulk density 0.70, Brookfield viscosity of 650 cps at 5 g/L, 300 cps at 2.5 g/L and 100 cps at 1 g/L, recommended make-up at 5 g/L and maximum at 10 g/L, and 120 minutes dissolution in DI water at 5 g/L and 25 degrees C.

The held 2007 catalogue places FO 4191 AR on page 18 under a family heading labelled high-conductivity resistant. We retain AR only as part of the complete product name; the held source does not define the letters themselves. The 2007 catalogue is an indicative historical document and its own footnotes describe the values as average figures given as an indication, explicitly not a specification. It tells us nothing about current SNF products, specifications or availability, and no claim on those points is made here.

FO 4191 AR and a generic low-charge medium-MW cationic powder are not interchangeable by description. The 2007 catalogue places FO 4191 AR on page 18 under a family labelled high-conductivity resistant, and the AR suffix is part of the full grade string that identifies this product. Removing that suffix from the enquiry or from the trial design can make an ordinary low-charge screening route look equivalent to a product that was positioned for high-conductivity process water.

The practical consequence is: if a buyer's feed runs at high conductivity — sludge dewatering with elevated ionic strength, for instance, or a paper mill white-water circuit — and the trial polymer is evaluated in laboratory DI water instead of the real feed, the conductivity-resistance property cannot be observed. A result from DI water is not a result from the process.

C8008 is at Low charge and Medium molecular weight on the ChinaPAM scale, which is the band pair that matches the FO 4191 AR row in the held catalogue. That match makes C8008 the closest public-band screening candidate for this grade. The gap is the AR property: our current 26-grade master does not include a high-conductivity-resistance attribute for C8008 or any other published grade.

We will not assert the AR feature for C8008 until it is tested and confirmed on the buyer's actual feed. The scope of the route is same-type low-charge cationic powder screening, with actual-feed conductivity testing as the step that establishes whether the AR characteristic is present in the selected grade at the buyer's operating conditions.

Prepare C8008 at 1–3 g/L, maximum 5 g/L, with dissolution within 60 minutes at working concentration. Do not make it up at the 5 g/L DI-water condition printed on this page — that condition belongs to the SNF test protocol and changes the dissolved polymer mass per litre compared with our preparation window.

Use the actual process water for both the make-up and the test. If the relevant duty involves elevated conductivity, run one set of jars at your typical operating conductivity and a second set at laboratory conductivity so the two conditions can be compared. Record dose rate, settled solids, clarity, centrate or filtrate quality and shear response. Send us the results and we will go through them with you before quoting for volume supply.