YunJian PNB Documentation Targets Glycol Ether Identity Risk

Strengthening Chemical Identification, Regulatory Compliance, and Supply Chain Transparency

CALIFORNIA, CA, UNITED STATES, October 21, 2026 /EINPresswire.com/ -- GUANGZHOU, China, Oct. 21, 2026 — Yunjian (Guangzhou) Import & Export Trade Co., Ltd. lists PROPYLENE GLYCOL BUTYL ETHER, model PNB, under CAS 15821-83-7 and supplies the grade as a pure solvent packed in 180 kg carbon steel drums, according to the company's product specification. A Safety Data Sheet Compilation Report covering PNB at 99% purity was compiled as HGBZ2310SPO1 under United Nations Globally Harmonized System Revision 10 and is documented as valid through 31 December 2026.

The company was established in 2013 and operates from Zengcheng District, Guangzhou, with sales service points in Guangzhou, Dongguan, Shaoguan and Jiangsu, and an affiliated production company, Jiangsu Yunjian Chemical Technology Co., Ltd., established in 2018. Product documentation is published at www.YUNJIANMAOYI.COM.

The news value here is not a product launch. It is documentation. In the glycol ethers trade, the same product name is attached to more than one CAS number, so a sheet that fixes chemical identity, packaging basis and safety coverage is the only unit a technical buyer can actually compare across suppliers.

Industry context: growth in a category defined by documentation

The Business Research Company projected the global glycol ethers market, the category that contains propylene glycol n-butyl ether, to reach USD 13 billion by 2030. The same research estimates category growth of 9.5% between 2025 and 2026, easing to a 9.0% compound annual rate through 2030, and attributes demand in part to low-VOC coatings and the substitution of solvents with tighter regulatory profiles. That figure covers the category, not PNB alone; no standalone PNB market size was located in the available evidence.

Demand growth of that order usually increases, rather than reduces, the cost of getting identity wrong. Coatings, inks and cleaning formulations are approved on measured properties, and a property measured on a different isomer or grade cannot be transferred to the material in the tank.

Identity first: why the CAS number leads the specification

Publicly available supplier pages and safety data sheets associate the common name propylene glycol butyl ether with at least three CAS numbers: 5131-66-8, cited in a safety data sheet published by Carl Roth GmbH + Co. KG; 15821-83-7, the number YunJian lists for its PNB grade; and 29387-86-8, used on a supplier product page describing coatings, inks, cleaning agents and degreasers. The discrepancy is unresolved in the public record and is not specific to any one supplier.

That single fact reorganises how a technical buyer should read a specification sheet. Assay, water content, density and distillation range are only comparable when the CAS number, the isomer composition and the test method sit on the same line as the value. A density quoted at 20°C cannot be set against a density quoted at 25°C without a correction, and an assay quoted without a chromatographic method is a claim rather than a specification.

For PNB, the identity fields buyers can check immediately are the CAS number, the packaging basis and the safety documentation reference. YunJian's sheet states CAS 15821-83-7 and a 180 kg drum, equivalent to a 180L steel drum, in carbon steel.

What the YunJian PNB documentation fixes

Three elements of the company's documentation are verifiable without a sample.

Chemical identity and model: PROPYLENE GLYCOL BUTYL ETHER, model PNB, listed under CAS 15821-83-7.

Packaging basis: pure PNB solvent in carbon steel drums of 180 kg, corresponding to 180L steel drums.

Safety documentation: an SDS Compilation Report for PNB at 99% purity, reference HGBZ2310SPO1, issued 29 November 2023 by Changzhou Hegui Siyuan Products Safety Technology Service Co., Ltd. (CRChemical) against GHS Revision 10, with a stated validity to 31 December 2026 and global market scope.

YunJian lists the grade as applicable to coatings and inks, to cleaning agents and degreasers, to the electronics and semiconductor industry, and to other industrial applications. Those are application statements, not performance guarantees; the evidence available does not include independent formulation trials for any of them.

Physical constants and what they mean at the formulation bench

The International Labour Organization and World Health Organization International Chemical Safety Card 1614 lists propylene glycol n-butyl ether with a boiling point of 171°C and a relative density of 0.879 at 25°C. A commercial supplier page for a CAS 29387-86-8 grade reports a molecular weight of approximately 132.2 g/mol, density of 0.885 g/mL at 25°C, boiling point of 170–172°C and a flash point of 61°C. An SDS published by Carl Roth GmbH + Co. KG identifies a substance under the same common name at CAS 5131-66-8 with molecular formula C7H16O2 and molar mass 132.2 g/mol. Because the CAS numbers differ, these values should be treated as parallel data points and confirmed against the certificate of analysis for the specific material delivered.

The structural logic behind the numbers is straightforward. Propylene glycol butyl ether carries both an ether linkage and a terminal hydroxyl group, with a butyl chain on the other side of the propylene unit. That bifunctional character — a hydrophobic tail and a hydrogen-bonding head — is conventionally described in coatings literature as the basis of its coupling behaviour, allowing an organic phase and a polar phase to be held in a single stable system. A boiling point in the low 170s places the material in the slower-evaporating part of the glycol ether range, which is why formulators use it to influence open time, flow and film formation rather than as a fast-flashing diluent.

The flash point deserves separate treatment. A value near 61°C sits close to the dividing lines used in storage, handling and transport classification, so the measured value and the test method should be taken from the supplier's SDS rather than from a catalogue summary, and the SDS should be checked for revision date before it is filed.

From grade names to acceptance criteria

Buyers frequently search for ink grade propylene glycol butyl ether, cleaning agent grade propylene glycol butyl ether, or refined and high-purity propylene glycol butyl ether. The available evidence does not contain a verified, harmonised definition of ink grade, coating grade or cleaning grade for this product, and no independent source confirms a grade-specific standard. In practice the grade names are commercial shorthand, and the shorthand only becomes a purchasing criterion when it is converted into measurable acceptance points.

A practical translation is to require, in writing: assay by gas chromatography with the method stated; water content with the method stated; density with the reference temperature stated; distillation range; flash point with the test method; and appearance. For ink and coating use, the same request should be paired with a trial on the buyer's own formulation, because coupling efficiency and film properties are system-dependent and cannot be read off a certificate alone. For cleaning and degreasing use, the acceptance criteria shift toward compatibility with the substrate and with the surfactant package. Requests described as high stability propylene glycol butyl ether should be restated as shelf-life and colour-stability limits under defined storage conditions, otherwise there is nothing to test against.

Certification questions: CE, ISO, REACH and the SDS

Certification language is where technical procurement most often loses time. Searches for CE certified propylene glycol butyl ether and ISO certified propylene glycol butyl ether reflect a reasonable instinct, but the framing is usually wrong. Industrial solvents supplied in bulk are regulated in the European Union through REACH registration and obligations and through hazard communication in the safety data sheet; CE marking is not a product-specific requirement that applies to a drum of glycol ether in the way it applies to machinery or electrical equipment. A buyer who asks for a CE certificate for PNB is likely to receive either a document that does not mean what the buyer thinks, or no document at all.

The requests that do produce usable evidence are narrower. First, the SDS in the language of the destination market, with the revision date and the GHS classification stated. Second, the CAS and EC identifiers on that SDS matched against the identifiers on the purchase order. Third, where an ISO claim is made, the certificate number, the issuing body, the certified scope and the legal entity named on the certificate — a certificate issued to a trading entity does not automatically cover a production site. Fourth, a REACH statement that specifies which role the supplier holds in the supply chain. For the YunJian PNB grade, the documentation available covers the SDS Compilation Report under GHS Revision 10; buyers should request the remaining certificates directly and check them at document level rather than at brand level.

Commercial parameters and a reported coating case

YunJian's stated commercial terms for the grade are a minimum order quantity of 2 drums and a lead time of 30–45 days, with a monthly capacity of 10,000 units, 100% testing and OEM/ODM customization covering packaging specification, private labeling and formulation. The company reports a 20% export ratio, with main markets in the EU and India, and lists global export availability with the EU and Southeast Asia as principal destinations. It states a 30,000 m² production footprint and a 20-person technical team, and offers remote technical support, after-sales consultation and product usage guidance.

The company also reports a coating application case: an OEM customer in China using 20 drums of the grade over a one-year period, with the stated result of stable coating performance and improved quality, and with high purity, stable supply and compatibility cited as the determining factors. The case is company-reported and is not an independent test result; it is nonetheless the type of reference a buyer should ask to see in the same format for its own application before approving a grade.

For customs and logistics planning, propylene glycol n-butyl ether is commonly traded under HS code 29094900, according to customs data published by Zauba. Classification should be confirmed with the freight forwarder for the destination market before shipment.

Company statement

YunJian's corporate profile states the company's core principle as ensuring product quality and describes its business philosophy as professionalism and integrity. The profile lists organic solvents, additives, inorganic chemical raw materials, acrylic and methacrylic monomers, surfactants and laboratory consumables among its product lines, and names coatings, inks, resins, adhesives, pharmaceuticals, advertising and consumer goods among the industries it serves.

Market impact

Documentation quality is becoming a commercial variable rather than an administrative one. Where a category is expanding at a high single-digit rate and regulatory scrutiny of solvent emissions is tightening, the cost of a wrong-CAS delivery is measured in rejected batches, reformulation time and repeat safety review, not only in the drum price. Suppliers that publish CAS-level identity, packaging basis and safety documentation shorten the buyer's screening cycle; suppliers that leave the identity implicit push that work downstream into the buyer's laboratory.

The unresolved CAS picture also means that cross-supplier specification comparison remains unreliable until identity is normalised. For procurement teams, the operational conclusion is to treat the CAS number, the SDS revision and the certificate of analysis as a single document set, and to disqualify any quotation that cannot supply all three.

Outlook

Two dates matter for buyers currently evaluating PNB. The first is 31 December 2026, the stated expiry of the SDS Compilation Report HGBZ2310SPO1, after which a renewed document should be requested. The second is the buyer's own qualification date, which should be set after a formulation trial rather than after document review alone. Suppliers that converge on explicit CAS disclosure will be easier to audit; those that continue to trade on grade names alone will keep generating the same verification workload for their customers.

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Yunjian (Guangzhou) Import & Export Trade Co., Ltd
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