Feed Grade Silica 826 from Zhongqi: Specs, Uses and Safety
Created on 10.23
Feed Grade Silica 826 from Zhongqi: Specs, Uses and Safety
Feed grade silica and the problems feed mills actually call about
Caking in the silo. Dust hanging around the mixer. A premix that bridges over the bin outlet at three in the morning and shuts the line down. Nobody buys feed grade silica because it sounds exciting. They buy it because something in the plant stopped flowing, and a small additive turned out to be the cheapest fix. It is a minor ingredient by weight, often well under one percent of the batch, but it decides how the feed handles, how long it keeps, and how much of it ends up on the floor instead of in the trough. That is the whole reason this material gets ordered by the container.
Who is behind the material
Zhongqi (Shandong) Silicon Materials Co., Ltd. makes precipitated silica in Shandong, China. The company has been in synthetic silica for more than twenty years and focuses on the feed and food side of the business, which means the production line is built around tight control of reaction conditions, washing, and drying rather than volume alone. Batch records are kept per lot, and the plant ships feed grade silicon dioxide to premix plants, pet food producers and distributors in several regions. Nothing glamorous here. It is a factory that runs the same process repeatably, which is what a buyer actually needs. More detail sits on the About Us page.
Anti-caking Agent Precipitated Silica 826: the spec sheet
Grade 826 is the general-purpose anti-caking and free-flow grade. It is a white powder or micro pearl, and the pearl form is usually preferred where dust control matters more than raw surface area. Here is the compact version of the typical specification, the numbers a formulation chemist will ask for first.
- Appearance: white powder or micro pearl
- Heating loss at 105°C: ≤ 5.0%
- Loss on ignition at 1000°C (dry basis): ≤ 7.0%
- DBP oil absorption: 2.0–3.0 ml/g
- SiO2 content (dry basis): ≥ 96%
- pH (5% suspension): 6.0–8.5
- Heavy metals: Pb ≤ 5 mg/kg, As ≤ 3 mg/kg, Cd ≤ 1 mg/kg
- Na2SO4: ≤ 3.0%
- Median particle size (d50): roughly 10–15 µm, adjustable by grade
Those limits are not marketing numbers. Heating loss tells you how much moisture the silica is carrying into your premix. Oil absorption tells you how much liquid carrier the particle can hold before it turns greasy. Particle size drives dust and flow at the same time, so the d50 you pick should match the mixer, not the catalog. Every lot ships with a COA, and the customized service route exists for buyers who need a different d50, a pearl form, or a tighter heavy-metal ceiling than the standard grade.
What feed grade silicon dioxide does inside the feed
Mechanically, the job is simple. The porous particle absorbs surface moisture and coats the sticky outer layer of hygroscopic ingredients such as molasses, choline chloride, vitamins, and some mineral salts, so particles stop gluing to each other. Flow improves, bridging drops, and the mixer empties clean. That also protects the sensitive part of the premix: when moisture is bound up, vitamin potency and enzyme activity hold better through storage and transport, and shelf life gets more predictable in hot, humid warehouses.
On the animal side, feed grade silica is inert. It is not a nutrient and it is not a drug. What the literature and field experience suggest is narrower: fine silica helps support normal digestion by slowing passage slightly and keeping the gut contents consistent, and it can help bind certain mycotoxins and irritants in the digestive tract, which supports the gut micro-environment rather than changing it. Some trials point to mild immune support through reduced exposure to gut irritants. Treat these as supportive effects, not treatments. On the market side, Grand View Research has put the global feed additives market at roughly USD 44 billion in 2023, with anti-caking and flow agents riding along as compound feed volumes grow in Asia and Latin America. Silicon dioxide also carries the E551 designation in the EU, which keeps the regulatory conversation short.
Standards, safety and the paperwork export buyers ask for
Heavy-metal limits are where a cheap silica becomes expensive. Lead, arsenic and cadmium come in with raw materials, so a supplier either controls the incoming sand and sodium silicate or quietly hopes the numbers pass. For an exporter shipping into the EU or Japan, one failed lot means a hold at the port and a customer who does not call back. That is why consistent specs matter more than a single good sample.
Practical advice: read the COA before you read the brochure. Check that heavy metals are reported per lot, not as a generic range, and confirm the heating loss figure against your own moisture spec. Ask for a third-party batch test on the first order, then compare two or three consecutive lots to see how much the numbers drift. We do not invent certificates. What we can show is a GMP-oriented production setup, routine batch testing, and a COA that matches what the lab actually measured.
Why buyers compare Zhongqi on more than price
The differences between suppliers show up in four places. Purity and the heavy-metal profile, because that is the risk item. Dispersibility, because silica that clumps in the mixer creates the very problem it was bought to solve. Low heating loss, because every point of moisture is water you are shipping and water your premix cannot afford. And batch-to-batch consistency, because reformulating around a drifting supply chain wastes more time than the price difference saves.
A simple checklist before you place a trial order:
- Does the COA report heavy metals per batch, not per year?
- Is heating loss at 105°C inside your premix moisture budget?
- Is d50 and the powder/pearl form matched to your mixer and dust rules?
- Can the supplier hold the same spec three lots in a row?
- What is the lead time from Shandong to your port?
Shipping is straightforward from Qingdao, and mixed grades can go in one container for distributors who stock both powder and pearl. Current news and application notes are posted under News.
Next step
If you want to test grade 826 against your current anti-caking agent, ask for a sample, a COA and the full spec sheet. Small trial quantities are easy to arrange, and the numbers will tell you more than any sales page. Reach the team through the contact form and tell them your mixer type and target inclusion rate.
Frequently Asked Questions (FAQ)
What is feed grade silica used for in animal feed?
It works mainly as an anti-caking agent and flow aid. The silica absorbs surface moisture and coats sticky particles so premixes, mineral mixes and molasses-based feeds stay free-flowing. It also helps carry liquids, reduces dust, and supports feed stability during storage.
Is feed grade silica the same as the silica in food?
Chemically it is the same material, synthetic amorphous silicon dioxide, and it carries the E551 designation in the EU. The difference is the grade control: feed applications need documented heavy-metal limits, a defined particle size and a heating-loss figure that fits the premix. Always check the COA rather than assuming one grade covers both uses.
What inclusion rate of feed grade silica should I use?
Most premix and mineral feed applications run somewhere between 0.5% and 2% of the batch, and anti-caking use in finished feed is often lower. The right number depends on how hygroscopic your ingredients are and how humid your storage is. Start low, watch flow and dust, and adjust.
Does silica affect digestion or animal health?
It is inert and not absorbed as a nutrient. What it can do is help keep gut contents consistent, support the gut micro-environment by binding irritants and some mycotoxins, and reduce exposure to dusty fines. These are supportive effects, not medical claims, and it should never replace a proper nutrition or veterinary program.
What does the heating loss figure tell a buyer?
It tells you how much moisture the silica brings with it. High heating loss means you are paying freight for water and adding moisture to a premix that may already be near its limit. Grade 826 is specified at 5.0% or below at 105°C.
How do I know the heavy-metal limits are real?
Ask for a COA that reports lead, arsenic and cadmium per lot, then run a third-party test on your first shipment. Compare two or three consecutive batches afterwards. A supplier who controls incoming raw materials will show stable numbers; one who does not will show drift.
Powder or micro pearl, which one should I order?
Powder gives faster dispersion and more surface area, so it suits liquid carrying and tight blending. Micro pearl is denser and generates far less dust, which most plants prefer for handling and for worker comfort. If dust is your main complaint, ask for the pearl form.
Can I get a custom feed grade silica specification?
Yes. Particle size, powder versus pearl, oil absorption and tighter heavy-metal ceilings can all be adjusted within the production range. Send your target spec and expected annual volume, and the plant will confirm what is achievable before you commit.
What is the lead time and shipping port for Zhongqi feed grade silica?
Production typically runs two to three weeks depending on grade and quantity, and shipments leave from Qingdao. Mixed powder and pearl grades can be consolidated into one container, which helps distributors who stock both. Confirm the schedule when you place the trial order.
How should feed grade silica be stored?
Keep it dry and sealed. The bags are moisture-barrier lined, but a humid warehouse will still push moisture into an opened bag. Store on pallets, off the floor, away from strong odors, and reseal part-used bags. Under those conditions shelf life is long, and the material will not change flow behavior in the bin.
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