Copper Sulfate Pentahydrate Sugar Fine Crystals Fine crystal · CuSO₄·5H₂O · CAS 7758-99-8
Bought because it dissolves. Where the coarse grade is specified to sink, this one is specified to go into solution fast — which is what solution make-up, Bordeaux batches and footbaths all need.
Chelora Chemicals is a fine crystal copper sulfate supplier and sourcing partner serving formulators, agricultural and industrial buyers across the United States, with the size band and end use agreed before dispatch.
- CAS Number
- 7758-99-8
- Chemical name
- Copper(II) sulfate pentahydrate
- Molecular formula
- CuSO₄·5H₂O
- Molecular weight
- 249.69 g/mol
- Copper as Cu
- 25.45%
- Crystal size
- Fine — free-flowing, per agreed mesh
- Dissolution
- Fast — the reason for the grade
- Transport
- UN 3077 · Class 9 · PG III
- HS Code
- 2833 25
Note: the grade ladder is about dissolution rate, not purity. US suppliers run a continuous size range — large crystal at roughly 8–20 mm, medium around 5–8 mm, small at 1–4 mm, then fine grades graded by mesh at 20, 30, 100 and 200. Every one of them is the same compound at the same assay. What changes is how fast it dissolves and where it ends up: coarse crystals sink and release slowly at depth, fine crystals go into solution quickly. "Stone" and "sugar fine" are trade descriptions rather than standardized sieve specifications, so the actual size band is agreed in writing.
The fine end of the same ladder
Identical chemistry to the stone crystal. The difference is entirely in how quickly it goes into solution.
Why it matters: the finest grades are specified for Bordeaux make-up — incomplete dissolution is the classic failure when a coarse crystal is used instead
What the fine grade is for
Copper sulfate pentahydrate sugar fine crystals are the fast-dissolving end of the grade ladder — a free-flowing fine blue crystal, roughly sugar-sized, at the same 25.45% copper as every other grade. The chemistry is identical to stone crystal. The behavior is the opposite.
Fine crystals go into solution quickly, which is what makes them the grade for anything measured into water: Bordeaux mixture make-up, liquid fertilizer, footbath solutions, and blower-dispersed algae treatment where the material has to act on contact. US grade listings place the finest material specifically against Bordeaux mixtures and solution work, and the 30-mesh band against feed and footbaths.
Where the fine grade is the right choice
- Bordeaux mixture make-up — the classic case, where incomplete dissolution ruins the batch.
- Solution and liquid fertilizer preparation, where dissolving time is production time.
- Footbaths and feed applications, where the material is measured and mixed rather than broadcast.
- The coarse grade if you are treating water bodies: stone crystal.
Handling character
Copper sulfate causes serious eye damage, is a Class 9 dangerous good, and the fine grade cakes more readily. Full detail is in the Safety section below.
| Parameter | Typical value |
|---|---|
| Appearance | Blue free-flowing fine crystals |
| Copper sulfate pentahydrate | Per agreed specification |
| Copper as Cu | 25.45% theoretical |
| Crystal size | Per agreed mesh band |
| Free-flow / anti-caking | Per agreed specification |
| Moisture / free water | Per grade specification |
Important: the figures above are indicative of commercial material and are offered for planning only. The batch certificate of analysis is the governing document.
| Property | Value |
|---|---|
| Physical state | Blue triclinic crystals |
| Molecular weight | 249.69 g/mol |
| Copper as Cu | 25.45% theoretical |
| Water solubility | Freely soluble |
| Density | ≈ 2.28 g/cm³ |
| Behavior in dry air | Slowly effloresces, losing water |
| Behavior in damp air | Cakes |
Physical constants compiled from public reference data for CAS 7758-99-8 and rounded for readability. All crystal size grades share the same chemistry and assay; they differ in dissolution rate and handling. Treat the table as orientation, not as a specification.
Where US industry uses the fine grade
Solution make-up, Bordeaux preparation, feed and footbaths.
Bordeaux mixture make-up
The classic application. Fine crystal dissolves completely and fast, which is what a Bordeaux batch needs.
- Finest grades specified for Bordeaux
- Ready-made Bordeaux also supplied
- Size band agreed in writing
Solutions & liquid fertilizer
Where dissolving time is production time, the fine grade is specified so the tank is not waiting on the crystal.
- Fast dissolution
- Low insolubles on request
- Bulk and bagged supply
Footbaths & animal husbandry
Measured and mixed rather than broadcast, so fast and complete dissolution matters.
- Consistent size lot to lot
- Feed-grade documentation on request
- Low heavy metals on request
Agriculture & soil amendment
Used as a copper micronutrient and soil amendment where even distribution and quick availability are wanted.
- Free-flowing for spreaders
- Anti-caking specified
- End use confirmed before quoting
Blower-dispersed algae control
Fine grades are dispersed by blower across water surfaces, acting on contact rather than sinking.
- Fine mesh band specified
- Pesticidal use needs EPA registration
- Pack sizes to suit
Import & compliance coordination
End use decides the route: pesticidal uses need a Notice of Arrival and an EPA-registered product; industrial uses do not.
- End use confirmed before quoting
- UN 3077 documentation prepared
- Broker coordination on request
Delivered to US plants and ports
We ship copper sulfate sugar fine crystals to nominated delivery points across the United States. The regions below are destinations we serve — Chelora Chemicals is a sourcing and supply partner, not a US manufacturer, and does not hold US stock.
Gulf Coast
The largest US chemical cluster, and the usual entry point for bulk consignments.
- Houston & Galveston, TX
- New Orleans & Baton Rouge, LA
- Mobile, AL
Northeast
Container and bulk delivery into the mid-Atlantic and New England manufacturing belt.
- Newark & Elizabeth, NJ
- Philadelphia, PA
- Boston, MA
Southeast
Port-side delivery for the Carolinas, Georgia and Florida processing plants.
- Savannah, GA
- Charleston, SC
- Jacksonville, FL & Norfolk, VA
Midwest & Great Lakes
Inland rail and truck forwarding from the nearest coastal port to the industrial Midwest.
- Chicago, IL
- Detroit, MI
- Cleveland & Columbus, OH
West Coast
Pacific routing for West Coast processors and formulators.
- Los Angeles & Long Beach, CA
- Oakland, CA
- Seattle & Tacoma, WA
Southwest & Mountain
Inland delivery to interior states, forwarded from the Gulf or Pacific gateway.
- Dallas–Fort Worth, TX
- Phoenix, AZ
- Denver, CO
Importing into the United States
Copper sulfate sugar fine crystals is a TSCA-regulated chemical substance. Under TSCA section 13 the importer of record, or its authorized agent, must certify to US Customs and Border Protection that each shipment either complies with TSCA or is not subject to it. We confirm the substance's TSCA Inventory status and agree in writing who files that certification before the first consignment moves.
Which party carries that duty follows the Incoterm. On FOB, CFR or CIF terms it is usually the US buyer; on DDP terms it can be the seller or its agent. Safety data sheets and labels are supplied to OSHA's updated Hazard Communication Standard, and the UN 3077 Class 9 transport documentation is prepared before booking.
| Item | How it works |
|---|---|
| Delivery points | Any nominated US plant, terminal or port of discharge |
| Incoterms quoted | FOB · CFR · CIF · DDP |
| Importer of record | Agreed in writing before the first shipment |
| TSCA certification | Section 13 positive certification filed at entry |
| Documentation | Batch COA, SDS, packing list, certificate of origin |
| Pack formats | 25 kg bags or bulk bags |
Note: regional coverage describes where we deliver, not where we hold inventory. Lead time depends on producer scheduling and ocean transit to your nominated US port — we confirm both in the quotation.
How we supply copper sulfate sugar fine crystals
Chelora Chemicals is a copper sulfate supplier and sourcing partner, not a manufacturer. On the fine grades the risk shifts from size to caking: fine crystal has far more surface area than stone, so it takes up moisture faster and sets hard in a bag that has been opened or badly stored.
We place your order with whichever qualified producer best matches your mesh band, your price point and your delivery window, and confirm the US import and FIFRA position before booking.
We will also tell you when the coarse grade is the right answer. If you are treating a pond for bottom algae, fine crystal dissolves at the surface and never reaches the problem.
- Mesh band agreed in writing, not left to "fine". US grade listings run from 20 through 200 mesh and they are not interchangeable — Bordeaux and solution work want the finest end.
- Caking addressed in the specification. Fine crystal has far more surface area than stone and takes up moisture faster, so free-flow and packaging are part of the order.
- End use confirmed before quoting. Copper sulfate has pesticidal, industrial and feed uses with different import routes.
- We will steer you to the coarse grade where that is right. For bottom-algae control in a water body, fine crystal is the wrong tool.
- UN 3077 documentation prepared before booking. Class 9 on aquatic toxicity grounds; the paperwork is not optional.
- Batch traceability to the producing plant. Full chain of custody documentation on request.
Bagged or bulk bagged
25 kg bags, bulk bags or drums — all moisture-barrier, which matters more on the fine grade.
25 kg poly-lined bags
Moisture-barrier bags on stretch-wrapped pallets, UN-marked — the barrier matters more on fine crystal.
500–1,000 kg bulk bags
Liner-fitted bulk bags for formulation and blending operations.
Fiber or plastic drums
Sealed drums where extended storage or maximum moisture protection is needed.
1 kg · 5 kg sealed packs
Small sealed packs to your approved label artwork where you hold a registration.
Incoterms to suit you
Quoted on the Incoterm your purchasing team works to, with dangerous goods documentation filed before booking.
Trial / sample quantities
Small packs dispatched for dissolution and Bordeaux make-up trials before a commercial order.
Serious eye damage and a Class 9 good
Copper sulfate is harmful by ingestion and causes serious eye damage, and it is very toxic to aquatic life with long-lasting effects — which is what makes it a Class 9 dangerous good. The summary below is orientation only — the safety data sheet supplied with your specific batch is the authoritative document.
Classified hazards
H302Harmful if swallowed.H315Causes skin irritation.H318Causes serious eye damage.H410Very toxic to aquatic life with long lasting effects.
End use decides the import route, and copper sulfate has unusually many end uses. Where the material is destined for a pesticidal use — algaecide, fungicide, root control — the import is a pesticide import: it requires a Notice of Arrival, EPA Form 3540-1, filed with Customs, and any product sold or applied in the US must itself be EPA-registered under FIFRA, with that registration held by the registrant and never by a raw material supplier. Where it goes to electroplating, mining flotation, leather or another industrial use, a different route applies. Feed use is a separate regulatory question again. Tell us the end use before we quote.
Storage
Store in sealed, moisture-barrier packaging in a cool, dry, covered area away from food, seed and feedstuffs. Copper sulfate pentahydrate slowly loses water of crystallization in dry air and cakes in damp air, so the pack matters — and it matters more the finer the crystal. Keep away from strong bases and from metals it will attack. Bunded or contained storage is advised because of the aquatic hazard.
Handling
Handle with dust control, impervious gloves and tight-fitting eye protection; copper sulfate causes serious eye damage and is harmful if swallowed. Prevent any release to drains, watercourses or soil. Follow the exposure controls set out in the batch SDS.
Transport
Copper sulfate is classified as dangerous goods for transport on the basis of aquatic toxicity, normally shipped as UN 3077, Environmentally hazardous substance, solid, n.o.s., Class 9, Packing Group III. Marked and labeled packaging, a dangerous goods declaration and compliant documentation are required. We confirm and document the classification for your specific grade, packaging and destination before booking.
Every batch, documented
We verify documentation before dispatch so there are no surprises at your incoming-goods bench.
Specification agreed
Crystal size band, copper assay, moisture and end use confirmed before order placement.
Producer batch testing
The producing plant tests each batch against the agreed specification before release.
Documentation review
COA, SDS, FIFRA position where pesticidal, and UN 3077 paperwork checked before booking.
Traceable dispatch
Each shipment is traceable to its producing batch, with full chain-of-custody records on request.
Why fine crystal behaves differently
Fine crystal comes out of the same process as stone crystal — copper or copper oxide reacted with sulfuric acid, then crystallized — with rapid cooling or higher supersaturation nucleating many small crystals instead of growing a few large ones. Same compound, same 25.45% copper, different crystallizer conditions.
The consequence is surface area. A fine crystal presents far more surface per unit weight than a stone crystal, and dissolution rate scales with exposed surface. That is why fine grades go into solution fast enough for Bordeaux make-up and liquid fertilizer work, and why US grade listings put the finest material specifically against Bordeaux mixtures and solution applications.
The same surface area is the handling liability. Copper sulfate pentahydrate cakes in damp air, and the finer the crystal the faster that happens. A fine grade in a poorly sealed or part-used bag will set hard, which is why free-flow behavior and moisture-barrier packaging are specified on this grade rather than assumed.
We do not publish operating process parameters here; this is background only. Full technical documentation accompanies every shipment, and any process-specific detail you need is best confirmed directly with our technical desk.
| Chemical family | Copper(II) sulfate pentahydrate |
|---|---|
| Copper content | 25.45% — all grades alike |
| Size | Fine, free-flowing; mesh band agreed |
| Why fine | Surface area drives fast dissolution |
| Classic use | Bordeaux make-up and solutions |
| Handling risk | Cakes faster than coarse grades |
The copper sulfate range and the coppers it feeds
The other copper sulfate grades, the Bordeaux family it supplies, and related coppers.
Copper sulfate sugar fine, answered
What does "sugar fine" mean?
How does it differ from stone crystal?
Which grade should I use for Bordeaux mixture?
Does the fine grade cake?
Is it a different purity from other grades?
Can I use it for pond algae control?
Is copper sulfate hazardous?
Can I import this into the United States?
Do you supply fine crystal copper sulfate in the United States?
Do you manufacture this yourself?
Get a quote on copper sulfate sugar fine crystals
Tell us the mesh band and the end use — the first decides dissolution behavior, the second decides the import route. If you are making Bordeaux, say so and we will quote the finest band or a ready-made Bordeaux instead.