FLOPAM AN 905 SH Equivalent — Very Low Charge Very High MW Anionic PAM

The figures below are reproduced from the SNF SAS powder catalogue, Catalogue 2007 Poudres, page 35, covering the FLOPAM AN 900 SH and SHU series. The catalogue prints its own caveat: the data are given for information only and do not constitute a specification. Verify against a current data sheet from SNF or its distributor before use in any contractual context.

The p.35 table lists AN 905 SH as the first product column and AN 905 SHU as the second; both carry very low charge density and very high molecular weight. The key published distinction is dissolution time: AN 905 SH shows 90 minutes at 5 g/l and 25°C, while the other eight product columns in the table — including AN 905 SHU — show 60 minutes. Recommended make-up concentration is 5 g/l and maximum is 10 g/l for both (SNF Catalogue 2007 p.35).

The key distinction from AN 905 VHM is molecular weight and viscosity. AN 905 VHM (Catalogue 2007 p.34) publishes Brookfield 1000 cps at 5 g/l with a 150-minute dissolution time. AN 905 SH publishes 500 cps at 5 g/l with a 90-minute dissolution time. The SH suffix indicates very high molecular weight, while VHM indicates ultra high molecular weight — a meaningful difference in make-up equipment sizing and dissolution tank residence time.

The observable differences between AN 905 SH and AN 905 VHM come directly from the SNF table. AN 905 VHM publishes Brookfield 1000 cps at 5 g/l and a 150-minute dissolution time. AN 905 SH publishes 500 cps at 5 g/l and a 90-minute dissolution time. Both grades publish the same 5 g/l recommended and 10 g/l maximum make-up concentration. Switching from SH to VHM on a tank sized around a 90-minute dissolution window means the tank residence time is insufficient for the VHM grade — verify vessel volume, agitation, and actual residence time before changing supply. Switching from VHM to SH on a tank sized around 150 minutes does not create an under-dissolution risk for the SH grade, but you should re-establish operating parameters against the SH figures rather than carrying over the VHM settings unchanged. These are the practical make-up equipment checks a jar or cylinder test will surface before you commit to volume.

Selection between the two grades depends on your make-up equipment baseline and water chemistry. Run both grades side-by-side on your actual feed water at several dose rates and compare settling rate and supernatant clarity. That test gives you a direct answer specific to your process — specification sheet comparisons do not.

If your bags currently read AN 905 SH and settling performance is acceptable, there is no reason to move to VHM. If settling rate is marginal and the process has low shear between the make-up tank and the addition point, a trial of VHM is worth running. Our supply grades cover both tiers; request a trial sample for whichever you want to test.

ChinaPAM supplies a low-charge, very-high-molecular-weight anionic PAM powder for AN 905 SH duty. SNF describes AN 905 SH at very low charge; our grade sits at the adjacent low charge band. We do not claim the products are identical or interchangeable without testing.

The right way to confirm fit is a jar test or cylinder settling test on your own feed water at several dose rates, comparing settling rate and clarity against your current AN 905 SH supply. Our preparation conditions differ from the SNF published figures: 1–3 g/L recommended, max 5 g/L, dissolution ≤60 min at working concentration. Use your standard make-up procedure and adjust for the different preparation window.

Request a trial sample with your water quality parameters. We will provide current TDS and MSDS plus batch-specific COA. Once the trial confirms performance, we confirm the supply grade and batch availability for production quantities.