Copper Hydroxide 50% WP 50% Cu as metal · WP · CAS 20427-59-2
The copper fungicide the US actually runs on — and at 50% copper as metal that is roughly 77% copper hydroxide, the composition the classic registered products have used for decades.
Chelora Chemicals is a copper hydroxide 50% WP supplier and sourcing partner serving registrants, repackers and distributors across the United States, with suspensibility, sieve residue and UN 3077 documentation agreed before dispatch.
- CAS Number (active)
- 20427-59-2
- Formulation type
- Wettable powder — WP
- Copper as Cu
- 50% w/w
- Copper hydroxide content
- ≈ 77% w/w
- Molecular formula (active)
- Cu(OH)₂
- FRAC group
- M1 — multi-site contact
- Appearance
- Blue to greenish-blue powder
- Transport
- UN 3077 · Class 9 · PG III
- HS Code
- 3808 92
Note: the arithmetic, so you can check any quote. Pure Cu(OH)₂ is 65.1% copper, so 50% copper as metal needs about 77% copper hydroxide — which is exactly the composition of the long-established registered products. Watch the basis, though: registered US labels do not all convert the same way. One declares 46.1% copper hydroxide as 30% metallic copper (the stoichiometric 65.1%); another declares 17.06% as 10% (an effective 58.6%). We state both figures and the basis on every quote.
From technical grade to wettable powder
A WP is a dispersion system. The copper is set upstream; the formulation decides whether it sprays.
Why it matters: 50% copper as metal ≡ about 77% copper hydroxide — one market states copper, the other the compound, and the material is the same
What copper hydroxide 50% WP is used for
Copper hydroxide 50% WP is a contact fungicide and bactericide carrying 50% copper expressed as metal — about 77% copper hydroxide. It protects the surface it lands on and does not move systemically in the plant, which is why coverage and timing matter more with copper than with a systemic product.
Two things make it the copper of choice in the United States rather than copper oxychloride. It carries more copper per unit weight, 65.1% in the pure compound against 59.5%. And it has by far the broader US registration base — the long-established registered copper fungicides are built on this chemistry, and some of them are labeled for use in organic production. The mode of action is FRAC M1, multi-site, so it stays a resistance-management anchor.
What the formulation specification controls
- Copper as Cu, 50% w/w. The declared active content, equivalent to roughly 77% copper hydroxide.
- Suspensibility. How much stays dispersed in the spray tank after standing — what decides field performance.
- Wet sieve residue and wettability. A WP that will not wet out or that blocks nozzles is a rejected lot.
- The technical grade behind it: copper hydroxide technical.
Handling character
Copper hydroxide WP is a Class 9 dangerous good and is heat-sensitive. Full detail is in the Safety section below.
| Parameter | Typical value |
|---|---|
| Appearance | Blue to greenish-blue free-flowing powder |
| Copper as Cu | 50% w/w ± tolerance |
| Copper hydroxide | ≈ 77% w/w |
| Suspensibility | Per agreed specification |
| Wet sieve residue | Per agreed specification |
| Wettability & pH | Per agreed 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 to greenish-blue powder |
| Active molecular weight | 97.56 g/mol |
| Water solubility (active) | Negligible — forms a suspension |
| Mode of action | Multi-site contact; FRAC M1 |
| Active decomposition | To CuO above ≈ 80–100 °C |
| Tank behavior | Suspension — requires agitation |
| Cu in pure Cu(OH)₂ | 65.1% |
Figures compiled from public reference data for CAS 20427-59-2 and from published US copper hydroxide label specifications, rounded for readability. Suspensibility, wet sieve and wettability are formulation parameters agreed per order rather than fixed constants. Treat the table as orientation, not as a specification.
Where the 50% loading is specified
Broad-spectrum disease control, organic-labeled products, resistance programs and registrant supply.
Broad-spectrum disease control
Bacterial and fungal diseases on citrus, grapes, pome and stone fruit, vegetables, nuts and field crops, in markets where it is registered.
- Suspensibility specified
- Consistent copper assay
- Label claims are registrant-specific
Resistance management programs
FRAC M1 multi-site activity makes copper the rotation anchor that protects single-site actives from resistance development.
- FRAC M1 on documentation
- Read the crop protection guide
- Program guidance on request
Products for organic production
Some registered copper hydroxide products are labeled for use in organic production — a route copper oxychloride largely lacks in the US.
- Organic status sits with the registrant
- Certifier approval is yours to obtain
- Documented batch traceability
Distributor & retail packing
Packed into 1 kg and 5 kg retail units to your approved label artwork where you hold the product registration.
- Artwork to your registrant label
- Cartoned retail packs
- UN 3077 marking throughout
Registrant & toll supply
Supplied in bulk to registrants and repackers holding their own product registration and label.
- 25 kg bags and bulk bags
- Specification held across the contract
- Second formulator qualified in reserve
Import & FIFRA coordination
A pesticide import needs a Notice of Arrival on EPA Form 3540-1, and US sale or use needs an EPA-registered product.
- NOA coordination with your broker
- UN 3077 documentation prepared
- Registration remains yours
Delivered to US plants and ports
We ship copper hydroxide 50% WP 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 hydroxide 50% WP 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 1 kg–5 kg retail packs |
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 hydroxide 50% WP
Chelora Chemicals is a copper hydroxide WP supplier and sourcing partner, not a manufacturer. On a formulated copper the assay is the easy part — what decides whether a lot performs is suspensibility, wettability and sieve residue, and we agree those before quoting rather than after a field complaint.
We place your order with whichever qualified formulator best matches your specification, your price point and your delivery window, and settle the FIFRA and import position before booking.
We are direct about the limit of what a supplier can do: we do not hold EPA product registrations and cannot lend one. Copper hydroxide is widely registered in the US, but the registration has to be yours.
- The copper basis stated both ways on every quote. 50% copper as metal, ≈77% as copper hydroxide — and registered US labels do not all convert on the same basis.
- Suspensibility and wet sieve agreed up front. These decide field performance and nozzle behavior and are invisible in a copper assay figure.
- Cool storage planned into the route. Copper hydroxide decomposes to copper oxide on heating and darkens as it does — a real risk on summer freight.
- UN 3077 documentation prepared before booking. Class 9 on aquatic toxicity grounds; the paperwork is not optional.
- FIFRA position settled honestly. A pesticide product must itself be EPA-registered for US sale or use, and imports need a Notice of Arrival. We coordinate; we do not register.
- Label and pack artwork to your registrant. Where you hold a registration, packaging is produced to your approved label rather than a generic one.
Bagged, or in retail packs
25 kg bags, bulk bags or small retail packs — all to UN 3077 marking and labeling requirements.
25 kg poly-lined bags
Moisture-barrier bags on stretch-wrapped pallets, UN-marked, the standard commercial unit.
1 kg · 5 kg sealed packs
Small sealed packs in cartons, produced to your approved label artwork where you hold the registration.
500–1,000 kg bulk bags
Liner-fitted bulk bags for repacking operations and large-scale distribution.
Fiber drums
Sealed fiber drums where extra moisture protection or extended storage is needed.
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 suspensibility, compatibility and spray trials before a commercial order.
A Class 9 dangerous good — and heat-sensitive
Copper hydroxide is moderately hazardous by ingestion and causes eye irritation, but the classification that governs its logistics is aquatic toxicity — 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.H319Causes serious eye irritation.H410Very toxic to aquatic life with long lasting effects.
Copper hydroxide is different from copper oxychloride on US registration, and it matters. Copper hydroxide is among the most widely EPA-registered copper fungicide actives in the United States, with a large family of registered products in current commercial use, and some of them are labeled for use in organic production. That does not change the rule: under FIFRA a pesticide product must itself be EPA-registered for US sale or use, that registration sits with the registrant and never with a raw material supplier, and an imported pesticide requires a Notice of Arrival, EPA Form 3540-1, filed with Customs. Organic status is product-specific and sits with the registrant and the certifier, not with us.
Storage
Store in sealed original packaging in a cool, dry, well-ventilated area, away from food, seed and feedstuffs and away from acids. Temperature is the controlling variable on this compound: copper hydroxide decomposes to copper(II) oxide on heating and darkens visibly as it does. Do not store in direct sun, against hot walls or in unventilated containers in summer. Bunded or contained storage is advised because of the aquatic hazard.
Handling
Handle with dust control, impervious gloves and eye protection; the material is harmful if swallowed and irritates the eyes, and repeated skin contact may sensitize some individuals. Prevent any release to drains, watercourses or soil. Follow the exposure controls set out in the batch SDS.
Transport
Copper hydroxide and its formulations are 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 IMDG or DOT-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
Copper content basis, crystal form, shade, particle size and moisture confirmed against your requirement before order placement.
Producer batch testing
The producing plant tests each batch against the agreed specification before release.
Documentation review
COA, SDS, TSCA or FIFRA position and UN 3077 dangerous goods paperwork checked by our desk before the shipment is booked.
Traceable dispatch
Each shipment is traceable to its producing batch, with full chain-of-custody records on request.
How a copper hydroxide WP is built
A wettable powder is a dispersion system, not a solution. Copper hydroxide is effectively insoluble in water, so the formulation must hold insoluble particles suspended in a spray tank long enough to be applied evenly. That means milling the technical grade to a controlled particle size and blending it with a wetting agent, a dispersant and an inert carrier.
The declared content is copper expressed as metal, following FAO specification and US label convention. Pure Cu(OH)₂ is 65.1% copper, so 50% copper as metal works out at about 77% copper hydroxide — the composition the long-established registered products have carried for decades. The remainder is carrier and surfactant system.
One caution specific to this chemistry. Copper hydroxide decomposes to copper(II) oxide on heating, from roughly 80 to 100 °C, and darkens as it does. A formulated WP inherits that sensitivity from its active, so warehouse and freight temperature matter here in a way they do not for a copper oxychloride WP, where the active is stable to around 250 °C.
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.
| Formulation type | Wettable powder — WP |
|---|---|
| Declared basis | Copper expressed as metal |
| Compound equivalent | ≈ 77% copper hydroxide |
| Why 77% | Pure Cu(OH)₂ is 65.1% copper |
| Mode of action | Multi-site contact — FRAC M1 |
| Storage caution | Decomposes to CuO on heating |
The copper range and related inorganics
The other copper grades and the salts and acids supplied from the same desk.
Copper hydroxide 50% WP, answered
What does the 50% in copper hydroxide 50% WP mean?
Why choose copper hydroxide over copper oxychloride?
Is it approved for organic production?
What is FRAC group M1 and why does it matter?
Does the WP need special storage?
Which specification parameters actually matter?
Is it dangerous goods to ship?
Can I sell or apply this in the United States?
What packing do you offer?
Do you supply copper hydroxide 50% WP in the United States?
Get a quote on copper hydroxide 50% WP
Send us your required copper basis, suspensibility and sieve specification, pack format and US delivery point — and tell us whether you hold a product registration, because that decides the import route.