In short: A water-dispersible granule that will not break up in the spray tank has usually been made too strong: too much binder, too much compaction, or a carrier that holds the granule together instead of letting water in. Test the three separately — vary the binder, vary the compaction, swap the carrier — because they look identical in the tank.
A WG has two contradictory jobs. It has to survive handling, shipping and pouring without dusting or crumbling, and it has to fall apart in seconds when it meets water. Everything that makes the first job easier makes the second harder.
Disintegration works by water penetrating the granule fast enough to break the bonds holding it together, helped by the wetting and dispersing agents in the formulation. If water cannot get in quickly, the granule sits on the surface, sinks whole, or breaks into lumps that block a filter.
That is why the fault is almost never one component. It is the balance between granule strength and water access, and the three things that set that balance are the binder, the compaction and the carrier.
Binder is the first suspect because it is the most common answer to a dust or attrition complaint. Someone raises the binder to stop granules crumbling in the bag, the complaint goes away, and six months later the tank-side complaint arrives.
The diagnostic is a ladder: make the same formulation at three binder levels, holding everything else constant, and test disintegration at each. If disintegration improves sharply as binder comes down while attrition stays acceptable, you have found it and the fix is a binder level, not a new carrier.
Binder type matters as well as level. Some binders redissolve readily in water and some do not, and one that has been through a hot drying step may not behave the way it did in the laboratory.
Whether the granule is extruded, pan-granulated or compacted, the process sets its density and porosity. A denser granule is stronger and less dusty; it is also harder for water to get into, because the pore network that lets water in has been squeezed shut.
Test it by running the same formulation at two or three process settings — extrusion pressure, screen size, pan time, roller gap — and comparing disintegration. If the laboratory batch disintegrates and the production batch does not, with the same recipe, the process is where to look.
This is also the most common reason a formulation that passed development fails at scale. The production equipment simply works the material harder.
The inert carrier is what gives the granule its internal pore structure. A carrier with accessible porosity gives water a route in; one that is too fine or that packs too tightly gives a granule that behaves like a pebble.
The carrier also carries the liquid components. If it is loaded near its ceiling, the pores that should be admitting water are already full, and disintegration suffers for a reason that looks nothing like a carrier problem. Dropping the load and adding carrier sometimes fixes a disintegration complaint on its own.
Our starting point for WP and WG carrier work is CENSIL 260P, with CENSIL 265P and CENSIL 280P beside it so the trial spans a range of absorption. Running all three at the same binder level and the same process setting tells you quickly whether the carrier is the variable.
Change one thing at a time. Batch A: three binder levels, carrier and process constant. Batch B: three process settings, binder and carrier constant. Batch C: three carriers, binder and process constant.
At each point measure the same things: disintegration time in your own water quality, suspensibility after standing, wet sieve residue, and attrition or dust on handling. Water quality matters more than people expect — hard water changes the result, so test in water that reflects where the product is sprayed.
Nine batches sounds like a lot until you compare it with six months of changing two things at once and learning nothing.
We supply the inert carrier, and everything above is about the physical formulation: how the granule is built and how water gets into it. We take no position on the active ingredient, on biological efficacy or on product registration — those are yours and your registration authority's.
What we can do is send carrier candidates with a test plan built around the three-way comparison, and read the results with you.
The one whose pore structure suits your binder and process — which is why we send a range rather than a single grade. Speed on its own is not the target either: a granule that disintegrates instantly but dusts in the bag has traded one complaint for another.
Two usual reasons: the production process compacts harder than the laboratory equipment, and field water is not laboratory water. Test at production settings, in water from the region the product is sold into.
It helps at the margin, but if water cannot get into the granule the dispersant has nothing to work on. Rule out binder and compaction first.
Yes. Once the granule has broken up, the carrier is part of what stays suspended. Measure disintegration and suspensibility together — a formulation can pass one and fail the other.
Third-party product and brand names are the trademarks of their respective owners and are used here only to identify the reference points customers benchmark against. No equivalence, affiliation or endorsement is claimed or implied.
The material you use now, the formulation or resin, the equipment and the target you need to hit. That is enough for us to say whether we have something worth testing.
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