If you run a feed mill, you already know the scene: a pallet of vitamin premix sits in the warehouse through a wet month, and when you finally cut the bag open, half of it is bricked up in the corner. Or the silo starts bridging, the screw conveyor runs half empty, and somebody on the line is banging the bin with a rubber mallet at two in the morning. That is usually the point where a buyer starts looking at feed grade silica, because the fix is not complicated — a small dose of amorphous silicon dioxide gives the powder somewhere to slide, absorbs a bit of the surface moisture, and keeps particles from locking together under pressure. It also works as a carrier, which matters when you are trying to get a 2% trace mineral or a vitamin blend spread evenly through a tonne of compound feed instead of clumping in one corner of the mixer. The rest of this guide is what we would tell a buyer across the table: what the material is, how to read a COA, what to ask before you place a first order, and where suppliers usually start cutting corners. We are a silica producer, so take our product claims with the usual grain of salt, but the checklist at the end is one you can use on any supplier, including us.

Zhongqi (Shandong) Silicon Materials Co., Ltd. is a silicon materials manufacturer based in Shandong, China, with more than two decades in precipitated silica and a product line that runs from industrial grades into feed and food-adjacent applications. Our feed grade silica side is built around animal nutrition: premix plants, mineral and vitamin pre-blends, compound feed, aquafeed and pet food. We handle the boring parts that buyers actually get judged on — batch records, retention samples, COAs issued per lot, GMP and FCC/USP-NF-aligned production, Halal and Kosher documentation where required, and export paperwork that does not stall at the port. If you want the short company version, it is on our About Us page; the longer version is a video call with our technical team and a sample bag on your bench. We are not the cheapest silica on Alibaba and we are not trying to be. What we sell is a grade that behaves the same way in June as it did in January, with paperwork that matches the bag in front of you.

Feed grade silica is amorphous silicon dioxide, usually produced by a precipitation route rather than a crystalline quartz route, and the amorphous form is the point — crystalline silica is a different material with a different safety profile and it does not belong in a feed premix. On a spec sheet you will see SiO2 content quoted on a dry basis, typically somewhere between 96% and 98% for feed grades, with the balance being bound water and trace residues. Moisture matters just as much as purity, because a powder that arrives at 7% moisture has already used up part of its anti-caking capacity before it ever meets your premix. Particle size is the third lever, and it changes behavior more than most buyers expect: a fine 800–1250 mesh powder gives you good coverage in a vitamin premix, while a coarser 200–400 mesh material flows better in a mineral blend that is already dense and dusty. Heavy metals and arsenic limits are the numbers your QC people will scan for first, and a serious supplier will list them rather than make you ask twice. Below is a typical specification range; treat it as a starting point and match it against the COA for the actual lot.

In a premix plant, feed grade silica usually goes in at somewhere between 0.5% and 2% of the batch, and the exact number depends on how hygroscopic your actives are and how long the bag will sit in a warehouse. Trace mineral pre-blends are the classic case, because copper sulphate, zinc oxide and iron salts all pick up moisture and then set like concrete under the weight of a pallet stack. Vitamin premixes are trickier, since you are dealing with small inclusion rates and you cannot afford segregation in the mixer — a fine silica carrier helps the active ride evenly through the batch instead of migrating to the bottom cone. In compound feed, the dose is lower and the goal is mostly mechanical: keep the mash flowing, stop the pellet mill from choking, reduce build-up on the cooler. Aquafeed is a growing slice of the business because shrimp and fish feeds are often dense, moist and stored in humid coastal conditions, which is close to a worst-case test for any anti-caking agent. Pet food manufacturers use it too, usually for flow in the extruded kibble coating line or in powder blends. The product list breaks these out by grade, but the honest answer is that we pick the grade after we know your feed type, your climate and your storage time.

Batch consistency is the thing buyers test first, and it is the hardest to fake, because it comes down to how tightly you control precipitation conditions and how seriously you take blending across lots. We hold retention samples and issue a COA per lot, so if a premix line starts bridging in month four you can pull the record and compare it with what was shipped. Controlled particle size is the second advantage, and it is not just a mesh number on paper — distribution curve matters, because a powder with a wide spread will segregate in the mixer while a tight cut will not. Low moisture is the third, and we dry and test to keep it comfortably under the limit rather than right at the edge, since a bag that tests at 4.9% in Shandong can read differently after six weeks in a hot container. Heavy-metal control is the fourth, and it is the one where a cheap offer usually shows its hand: ask for the actual test result, not a sentence saying the product complies. Flexible packaging and pre-shipment sampling round it out, because a buyer ordering two pallets for a trial should not be forced into a full container. Our customized silica grades page covers how we adjust mesh, moisture and packaging, and you can request a sample before committing to any of it.

Shandong is one of the denser silicon materials clusters in China, which means raw material access,成熟的 precipitation equipment and a deep pool of people who have spent years running these lines — that supply base is a real cost and lead-time advantage, not a marketing line. Our focus is silicon materials rather than a trading catalogue with silica somewhere on page nine, so when you ask a technical question about why your vitamin premix is still caking, you get somebody who has seen the problem rather than a salesperson forwarding your email. Export documentation is handled in-house: COA, MSDS, non-GMO statement, Halal and Kosher certificates where needed, packing list and origin documents, all issued before the container leaves. Lead time on standard grades is stable because we are producing, not chasing spot cargo. The comparison that matters, though, is not price per tonne against a generic silica trader — it is spec clarity and lot traceability. A generic offer might quote "silica 98%" with no moisture figure, no heavy metals, no mesh distribution and no clear statement that it is amorphous, and that is where feed mills get burned. A few hundred dollars saved on a container is not worth a recall, and we would rather lose the order than pretend otherwise.

Anti-caking agents are a small-volume category, often under 2% of a formulation, but they are one of the few additives that can stop a whole production line — which is why demand holds up even when feed margins are thin. Alltech's 2024 Agri-Food Outlook put global compound feed production at roughly 1.38 billion tonnes, with Asia-Pacific remaining the largest producing region and poultry the biggest single species segment. That volume matters here: every tonne of premix and compound feed that has to stay free-flowing through humid storage is a potential application, and the growth in aquafeed and pet food in Asia is pushing specifications tighter rather than looser. The FAO and IFIF have both flagged feed safety and additive traceability as ongoing priorities for the sector, and buyers are responding by asking for documentation they did not ask for five years ago. None of this makes silica a glamorous product. It just makes it one of those small inputs where supplier choice quietly determines whether your line runs or stops.

Start with the COA and read it properly: SiO2 on a dry basis, moisture or loss on drying, heavy metals as Pb, arsenic, and the particle size distribution rather than a single mesh number. Confirm in writing that the material is amorphous silica and that the supplier will state this on the COA, because that single word separates a feed-grade product from an industrial one. Ask what the typical moisture is at the time of loading, not just the maximum on the spec sheet, and ask how it is packed and whether the inner liner is food-grade. Get the MOQ, the lead time for a repeat order and the lead time for a custom mesh, since those two numbers are often very different. If you sell into markets that require Halal or Kosher certification, ask for the certificate copy up front rather than after the PO. Ask for a pre-shipment sample from the actual production lot, not from an archived reference sample. And ask who answers technical questions at 9pm your time, because that tells you more about a supplier than the brochure does. If you want to run this checklist against us, start at the contact form and we will send the documentation pack with the sample.

A silica that performs beautifully in a dry, air-conditioned premix plant in northern Europe can disappoint in a coastal warehouse in Southeast Asia, and the difference is usually moisture pickup rather than purity. Dense mineral blends generally want a coarser, freer-flowing grade, while vitamin and micro-ingredient premixes usually want a finer one with good coverage. If your storage cycle is long or your rainy season is real, pay for the lower moisture spec instead of arguing about the last fifty dollars a tonne. We would rather send you two kilos to test in your own mixer than guess at the right mesh from a spreadsheet. Send us your feed type, inclusion rate, storage conditions and target market, and you will get a grade recommendation, a sample and a quote — in that order, because the quote is the least useful of the three until the sample has been through your line.

Feed grade silica is used mainly as an anti-caking agent and free-flow aid, and as a carrier for small-inclusion actives. It absorbs surface moisture and physically separates particles so powders keep moving through silos, mixers and bagging lines. Typical inclusion is 0.5% to 2% in premixes and lower in compound feed. It is also used in aquafeed and pet food where dense, moist formulations tend to bridge.

No, and the distinction matters. Feed grade silica is amorphous silicon dioxide, produced by a precipitation route, while crystalline silica is a different material with a very different safety profile. A proper COA should state the amorphous form explicitly. If a supplier cannot confirm amorphous on paper, treat that as a red flag regardless of how good the price looks.

Most feed grades sit between 96% and 98% SiO2 on a dry basis. Higher is not automatically better, because the balance is bound water and trace residues, and what really affects performance is moisture at loading plus particle size distribution. Read the full COA rather than fixing on the purity number alone.

Most specifications cap loss on drying at 5%, and many good lots run 3% to 5%. Ask for the typical value at loading, not just the maximum, because a bag that tests near the limit can pick up more moisture in a hot container. In humid climates, a lower moisture spec is usually worth the small price difference.

Fine grades around 800–1250 mesh suit vitamin and micro-ingredient premixes where even coverage matters. Coarser grades around 200–400 mesh flow better in dense mineral blends. The right answer depends on your mixer type, inclusion rate and how dusty your line already is, so test a sample before locking a mesh size into your spec.

Common limits are heavy metals as lead at no more than 10 ppm and arsenic at no more than 3 ppm, though your destination market may set stricter requirements. Always ask for the actual test result for the specific lot rather than a general compliance statement. That is the difference between a documented product and a promise.

Yes. Because the particles are fine, inert and free-flowing, feed grade silica can carry small amounts of vitamins, trace minerals or additives and spread them evenly through a batch. This reduces segregation in the mixer and stops concentrated pockets forming. It is one of the more practical uses beyond simple anti-caking.

Standard packaging is 10, 15, 20 or 25 kg bags with a food-grade inner liner, plus 500–1000 kg jumbo bags for larger plants. Export shipments usually include COA, MSDS, non-GMO statement and Halal or Kosher certificates where required. Confirm pallet configuration and liner type before booking, since these affect both handling and unloading time.

MOQ depends on grade and packaging, and trial quantities are usually possible for buyers evaluating a first order. Standard grades ship on a stable schedule, while custom mesh or moisture specifications take longer because they need a dedicated production run. Ask for both lead times separately so you are not caught out on a repeat order.

Yes, Halal and Kosher documentation can be provided where your destination market requires it, along with the standard export paperwork. It is worth raising the requirement at the enquiry stage rather than after the purchase order. Certificate copies can be sent with the sample so your compliance team reviews them early.