Feed Anti-Caking Agents for Premix and Compound Feed
Direct answer
A feed anti-caking agent is an inert mineral — feed grade silicon dioxide, bentonite or zeolite — added at low inclusion to keep premix and compound feed flowing through bins, augers and bagged storage.
This page is about feed grade materials for mineral premix, compound feed and feed mills. If your powder is a seasoning, beverage premix or salt for human food, the permitted agents and the documentation are different — see Food Anti-Caking Agents. An anti-caking agent adds no nutritional value; it protects flow, dosing accuracy and mixing homogeneity.
Choose in one table
| Situation in the mill | Use | Why |
|---|---|---|
| Hygroscopic micro-premix (choline chloride, trace mineral sulphates) | Feed grade silicon dioxide | Highest surface area per kilogram; works at the lowest inclusion |
| Compound feed that also needs pellet durability | Bentonite | Binds free moisture and acts as a pellet binder |
| Moisture plus ammonia load in storage or barn | Zeolite | Porous aluminosilicate adsorbs both |
| Caking only after a cooler or dryer upset | Fix the process first | Dosing more additive masks a moisture fault |
| Fat-coated or molasses-containing feed | Silicon dioxide at raised inclusion, validated on the blend | Free fat, not humidity, is bridging the particles |
Why feed cakes in the first place
Caking is driven by moisture migration, hygroscopic salts (choline chloride, trace mineral sulphates), fat inclusion, compaction under bin head pressure, and temperature cycling between day and night storage. Once particles bridge, mass flow becomes funnel flow, discharge becomes erratic, and the mixer no longer receives the intended ratio of micro-ingredients.
How the three common carriers behave
- Feed grade silicon dioxide — very high surface area, works as a physical separator on particle surfaces; the usual choice for hygroscopic premixes at low inclusion.
- Bentonite — a layered clay that binds free moisture and also acts as a pellet binder; typically used at higher inclusion than silica.
- Zeolite — a porous aluminosilicate used where moisture and ammonia adsorption in the barn or in storage matters as much as flow.
Practical guidance for feed mills
Fix the moisture source before increasing the anti-caking dose. Check condensation in bins, cooling after pelleting, and storage humidity. Confirm that the additive you buy is a feed grade with the documentation your regulator and your customer's audit require — food or technical grades of the same chemistry are not interchangeable on a feed label.
Inclusion is a formulation decision, not a catalogue number: it depends on the carrier, the moisture load and the permitted level for the feed category in Canada. Validate on your own blend before fixing a specification.
Documentation to request from a supplier
Feed grade specification sheet, safety data sheet, moisture and loss-on-drying values, particle size range, bulk density, heavy metal limits, and confirmation of the regulatory status of the grade in Canada.
What to put on the RFQ
- Carrier you want quoted (silica, bentonite or zeolite) or "supplier to advise".
- Feed type — mineral premix, micro-premix, compound feed, pelleted or mash.
- Approximate moisture and fat content of the blend.
- Target inclusion, or the flow problem you need solved.
- Packaging — bags, big bags or bulk.
- Annual volume and delivery province.
Ready to specify? Send those six fields with your RFQ at /quote.