SULFUR- ▸ Crop protection: Agricultural fungicide and acaricide/insecticide active.
- ▸ Rubber vulcanization: Crosslinking agent for natural and synthetic rubber.
- ▸ Chemical feedstock: Raw material for sulfuric acid, sulfites, and carbon disulfide.
- ▸ Bleaching: Bleaching of wood pulp, straw, wool, silk, and linen.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
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Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.
Colloidal sulfur (micronized / wettable elemental sulfur; CAS 7704-34-9) is very finely divided elemental sulfur, milled to a small, uniform particle size and formulated to wet out and disperse readily in water. The fine particle size and high surface area are what make it useful as an active and a reactant across agriculture, rubber and industrial applications.
What is colloidal sulfur?
Colloidal (micronized) sulfur is elemental sulfur (S) reduced to a fine particle size, often with dispersing agents so it forms a stable suspension in water (a wettable or flowable grade). It is the same element as ordinary sulfur; the value is in the particle size, surface area and dispersibility, which govern how it performs as a reactant or active.
Applications by sector
Agriculture. Elemental sulfur is a long-established active used in crop-protection and soil/nutrient products; micronized wettable grades are the form used in spray formulations. Any crop-protection use is subject to registration of the finished, formulated product with the relevant authority — no pesticidal efficacy is claimed for the raw material here. Rubber. A vulcanizing agent that crosslinks rubber during curing. Industrial & chemical. A reactant and feedstock (for example in sulfur chemistry and specialty compounding). Personal care. A topical sulfur ingredient used in formulated products; formulate and substantiate any product claims under the applicable regulations. Select the grade by particle size and dispersibility.
Forms and grades
Supplied as micronized powder and as wettable/dispersible grades at stated sulfur content and particle size; specify the grade on the RFQ. The CoA documents the lot.
Handling and documentation
Sulfur dust is combustible and can form explosive dust–air mixtures; control dust and ignition sources and handle per the current Safety Data Sheet (SDS). Each lot ships with a Certificate of Analysis (CoA).
Bulk supply and RFQ
RawSource supplies colloidal/micronized sulfur in bulk to agricultural-formulation, rubber and industrial buyers, with CoA and SDS per lot. Submit an RFQ with your grade and target quantity.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical Name | Colloidal / micronized elemental sulfur |
| CAS Number | 7704-34-9 |
| Molecular Formula | S |
| Appearance | Fine yellow powder or wettable/dispersible grade |
| Key attribute | Small, uniform particle size; high surface area; water-dispersible |
| Function | Active / reactant (agriculture, rubber vulcanization, chemical) |
| Hazard / handling | Combustible dust — refer to the current SDS |
Frequently Asked Questions
What is colloidal sulfur used for?
Colloidal (micronized) sulfur (CAS 7704-34-9) is finely divided elemental sulfur used as an active in agricultural crop-protection and soil formulations, as a vulcanizing agent in rubber, as a reactant/feedstock in industrial chemistry, and as a topical sulfur ingredient in formulated personal-care products.
What makes colloidal sulfur different from regular sulfur?
It is the same element milled to a much finer, more uniform particle size and made water-dispersible (wettable), which increases surface area and lets it suspend and perform in sprays and formulations.
Is colloidal sulfur a pesticide?
Elemental sulfur is a long-established crop-protection active, but any pesticidal use requires registration of the finished, formulated product with the relevant authority. We supply the raw material and make no pesticidal efficacy claim for it.
What is the CAS of colloidal sulfur?
Elemental sulfur is CAS 7704-34-9. Colloidal/micronized grades are specified by sulfur content and particle size; the CoA documents each lot.
How is bulk colloidal sulfur supplied and quoted?
RawSource supplies micronized and wettable grades in bulk with CoA and SDS per lot. Pricing is quote-based on grade and volume; submit an RFQ with your target quantity.
Disclaimer. Information on this page — including chemical properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot you purchase governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim, or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information.