{
  "documentType": "public-facts",
  "schemaVersion": "1.0",
  "title": "Yantai Dasteck Chemicals Co., Ltd. - published facts",
  "asOf": "2026-09-19",
  "language": "en",
  "publisher": {
    "name": "Yantai Dasteck Chemicals Co., Ltd.",
    "url": "https://dasteck.com/",
    "email": "sales@dasteck.com",
    "telephone": "+86-535-6530669",
    "address": "59 Huagong Road, Yantai, Shandong 264002, China",
    "publicInformationPage": "https://dasteck.com/transparency.html"
  },
  "usage": "These facts may be quoted and reused with attribution to Yantai Dasteck Chemicals Co., Ltd.",
  "verificationLegend": {
    "third-party-certificate": "Verified by an independent certification or testing body; the certificate or report number is given so it can be checked.",
    "supplier-declaration": "Published by the manufacturer; not independently certified.",
    "product-specification": "Published product specification. Batch-specific measured values are on the certificate of analysis issued with each shipment.",
    "regulatory-reference": "Taken from the safety data sheet or a regulatory classification.",
    "public-record": "Publicly recorded information."
  },
  "facts": [
    {
      "id": "annual-production-capacity",
      "topic": "capacity",
      "statement": "Annual production capacity for thiourea dioxide is 10,000 tonnes per year.",
      "value": 10000,
      "unit": "tonne/year",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "urgent-order-capacity",
      "topic": "capacity",
      "statement": "Capacity is available to serve large customers, including orders with an urgent delivery requirement. Production runs on parallel automated lines, so a large contract is not limited by the cycle time of a single line.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "production-start-year",
      "topic": "company",
      "statement": "Thiourea dioxide (TDO / FAS) has been produced since 1983 - over 40 years of continuous production.",
      "value": 1983,
      "unit": "year",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "founded-year",
      "topic": "company",
      "statement": "The company was founded in 1958.",
      "value": 1958,
      "unit": "year",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "samples-solubility",
      "topic": "product-performance",
      "statement": "Solubility in water at 20 C is 26.7 g/L, and a saturated solution has a pH of 5.0. The product dissolves readily and completely.",
      "value": 26.7,
      "unit": "g/L at 20 C",
      "source": "Published product specification",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "reducing-power",
      "topic": "product-performance",
      "statement": "Maximum reduction potential is approximately -1230 mV, giving a strong and fast reduction.",
      "source": "Published product specification",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "reducing-power-vs-hydrosulfite",
      "topic": "product-performance",
      "statement": "Sodium hydrosulfite has a maximum reduction potential of approximately -1080 mV, so thiourea dioxide gives a stronger reduction at the same addition.",
      "source": "Published product specification",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "drying-technology",
      "topic": "process",
      "statement": "Drying uses an in-house fully automated technology that brings the product to specification in a very short time, so the product is exposed to heat only briefly.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "stability-vs-comparable-products",
      "topic": "quality",
      "statement": "Because exposure to heat during drying is short, decomposition is limited and the stability of the finished product is higher than that of comparable products from other producers. Conventional manual drying holds the material hot for much longer.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "whiteness",
      "topic": "quality",
      "statement": "Whiteness is compared visually: the product is visibly whiter than comparable products, a judgement customers also report. Thiourea dioxide has no whiteness index specification, so no index value is published.",
      "source": "Company statement, customer feedback",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "crystal-grain",
      "topic": "quality",
      "statement": "Crystal grain is finer and more uniform; grain size is concentrated in the 60-100 mesh range, giving a more consistent dissolution rate.",
      "source": "Company product specification",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "flowability",
      "topic": "quality",
      "statement": "Supplied as a free-flowing white crystal powder; feeds and dispenses evenly.",
      "source": "Published product specification",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "caking-tendency",
      "topic": "quality",
      "statement": "Treated to resist caking, so bags remain free-flowing through storage. Caking is checked by three methods: visual inspection, finger-pressure test and sieving.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "active-ingredients",
      "topic": "specification",
      "statement": "Active ingredients: 99% minimum.",
      "value": 99,
      "unit": "% min",
      "source": "Published product specification",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "moisture-content",
      "topic": "specification",
      "statement": "Moisture: 0.05% maximum.",
      "value": 0.05,
      "unit": "% max",
      "source": "Published product specification",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "thiourea-content",
      "topic": "specification",
      "statement": "Thiourea content: 0.1% maximum.",
      "value": 0.1,
      "unit": "% max",
      "source": "Published product specification",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "ash-content",
      "topic": "specification",
      "statement": "Ash content: 0.17% maximum.",
      "value": 0.17,
      "unit": "% max",
      "source": "Published product specification",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "iron-content",
      "topic": "specification",
      "statement": "Iron (II) ion: 0.001% maximum.",
      "value": 0.001,
      "unit": "% max",
      "source": "Published product specification",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "pre-shipment-testing",
      "topic": "quality-control",
      "statement": "All finished product is examined across the complete specification before shipment - from quality through to stability - covering active ingredients, thiourea, moisture, ash, iron, appearance and whiteness, crystal grain and flowability, solubility and caking tendency.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "batch-safety-test",
      "topic": "quality-control",
      "statement": "Every batch must pass a dedicated safety performance test before dispatch. The method is proprietary to Dasteck. A batch that does not meet the standard is not permitted to leave the factory.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "batch-traceability",
      "topic": "quality-control",
      "statement": "Batches are traceable from raw material through to shipment, and a retention sample is kept for every batch.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "constant-temperature-storage",
      "topic": "storage",
      "statement": "Finished goods are held in a constant-temperature warehouse kept at 25 C, not an ambient one, to preserve product stability from production through to loading.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "safety-record",
      "topic": "safety",
      "statement": "Decades of operation with zero accidents, supported by automated process control, per-batch safety performance testing and strict EHS management.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "transport-classification",
      "topic": "transport",
      "statement": "For transport the product is UN 3341, Class 4.2 (self-heating substance), packing group III, and is not classified as a marine pollutant.",
      "source": "Safety data sheet, section 14",
      "verification": "regulatory-reference",
      "asOf": "2026-09-19"
    },
    {
      "id": "china-hazardous-chemicals-catalogue",
      "topic": "transport",
      "statement": "Not listed in China's Catalogue of Hazardous Chemicals (2015 edition) for production and storage.",
      "source": "Regulatory classification, catalogue comparison",
      "verification": "regulatory-reference",
      "asOf": "2026-09-19"
    },
    {
      "id": "dangerous-goods-export-capability",
      "topic": "transport",
      "statement": "Dasteck handles the export of thiourea dioxide as a regulated dangerous good: UN-approved packaging, dangerous-goods marking and labelling, IMDG-compliant sea-freight documentation, carriage with carriers that accept Class 4.2 cargo, and per-batch COA and SDS with the shipment.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "iso-9001-certification",
      "topic": "certification",
      "statement": "ISO 9001:2015 quality management system certificate, no. 05326Q00214R201, issued by Beijing NGV Certification Center Co., Ltd.; scope: production of thiourea dioxide.",
      "source": "Certificate 05326Q00214R201",
      "verification": "third-party-certificate",
      "asOf": "2026-09-19"
    },
    {
      "id": "zdhc-conformance",
      "topic": "certification",
      "statement": "ZDHC MRSL V3.1 Level 1 conformance, test report no. 178232824a 001, TUV Rheinland / CCIC (Qingdao) Co., Ltd.; usage category 1.3.17 reducing agents.",
      "source": "Test report 178232824a 001",
      "verification": "third-party-certificate",
      "asOf": "2026-09-19"
    },
    {
      "id": "industry-standard-drafting-unit",
      "topic": "certification",
      "statement": "Participating drafting unit of HG/T 3258-2010, the Chinese industry standard for thiourea dioxide.",
      "source": "Public standard record",
      "verification": "public-record",
      "asOf": "2026-09-19"
    },
    {
      "id": "free-samples",
      "topic": "commercial",
      "statement": "Samples are supplied free of charge for customer trials, accompanied by technical data sheets.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "why-manufacturer-direct",
      "topic": "why-dasteck",
      "statement": "Manufacturer direct: We supply straight from our own plant. With no middlemen in the chain, we are able to offer competitive FOB and CIF pricing directly to our customers.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "why-premium-raw-materials",
      "topic": "why-dasteck",
      "statement": "Premium raw materials: We purchase superior raw materials to secure the lowest possible impurity content and the highest purity. Where other producers economise on feedstock, we do not.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "why-fully-automated-production-control",
      "topic": "why-dasteck",
      "statement": "Fully automated production control: Our entire production line runs on fully automatic control equipment, ensuring accuracy, consistency and stability at every stage of process control.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "why-complete-in-house-testing",
      "topic": "why-dasteck",
      "statement": "Complete in-house testing: Every index is verified against a complete set of sophisticated and strict testing methods before the product leaves our plant. Most producers test purity alone and assess moisture by experience and visual inspection; we test the full specification.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "why-per-batch-safety-performance-testing",
      "topic": "why-dasteck",
      "statement": "Per-batch safety performance testing: Each batch must pass a dedicated safety performance test before dispatch. Any batch that fails to meet the standard is not permitted to leave the factory. The testing method itself is proprietary to Dasteck.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "why-precision-automatic-drying",
      "topic": "why-dasteck",
      "statement": "Precision automatic drying: Our automatic drying equipment ranks among the most advanced in the industry, delivering among the shortest drying times achievable together with precise moisture control. Conventional manual drying depends on operator judgement for both time and temperature; our process removes that variability.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "why-constant-temperature-storage",
      "topic": "why-dasteck",
      "statement": "Constant-temperature storage: Finished goods are held in a constant-temperature environment to preserve product stability.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "why-traceable-batches",
      "topic": "why-dasteck",
      "statement": "Traceable batches: Every lot is tracked from raw material through to shipment, and a retention sample is kept for each batch for convenient tracking and traceability.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "why-full-documentation",
      "topic": "why-dasteck",
      "statement": "Full documentation: COA, SDS, packing list and certificates accompany every batch.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "why-decades-zero-accidents",
      "topic": "why-dasteck",
      "statement": "Decades, zero accidents: Automated process control and strict EHS management have delivered decades of operation without a single accident.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "iso-9001-validity",
      "topic": "certification",
      "statement": "ISO 9001:2015 certificate no. 05326Q00214R201 issued 2026-06-11, valid to 2029-06-10, by Beijing NGV Certification Center Co., Ltd. (NGV, CNAS C053-M).",
      "source": "Certificate 05326Q00214R201",
      "verification": "third-party-certificate",
      "asOf": "2026-09-19"
    },
    {
      "id": "zdhc-validity",
      "topic": "certification",
      "statement": "ZDHC MRSL V3.1 Level 1 conformance report no. 178232824a 001 issued 2025-12-15, valid to 2027-12-14, by TUV Rheinland/CCIC (Qingdao) Co., Ltd. Result: PASS.",
      "source": "Report 178232824a 001",
      "verification": "third-party-certificate",
      "asOf": "2026-09-19"
    },
    {
      "id": "packaging",
      "topic": "commercial",
      "statement": "Packed in 25 kg / 80 kg kraft-paper or plastic woven bags, 50 kg fibre drums or 500 kg jumbo bags; other packing on request.",
      "source": "Published product information",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "dosage-vs-hydrosulfite",
      "topic": "product-performance",
      "statement": "For the same effect the dosage is roughly one third to one fifth of the sodium hydrosulfite amount.",
      "source": "Published product information",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "warehouse-temperature",
      "topic": "storage",
      "statement": "The constant-temperature finished-goods warehouse is held at 25 C.",
      "value": 25,
      "unit": "degC",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "caking-test-methods",
      "topic": "quality-control",
      "statement": "Caking tendency is checked by three methods: visual inspection, finger-pressure test and sieving.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "production-lines",
      "topic": "capacity",
      "statement": "Thiourea dioxide is produced on 5 large-scale automated production lines.",
      "value": 5,
      "unit": "lines",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "line-capacity",
      "topic": "capacity",
      "statement": "Each production line is rated at 2,000 tonnes per year, giving the published annual capacity of 10,000 tonnes.",
      "value": 2000,
      "unit": "tonne per year",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "crystal-grain-size",
      "topic": "quality",
      "statement": "Grain size is concentrated in the 60-100 mesh range.",
      "value": "60-100",
      "unit": "mesh",
      "source": "Company product specification",
      "verification": "product-specification",
      "asOf": "2026-09-19"
    },
    {
      "id": "accident-statistics",
      "topic": "safety",
      "statement": "Accident statistics: none recorded.",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "shelf-life",
      "topic": "quality",
      "statement": "Shelf life (warranty period) is 12 months from the date of production.",
      "value": 12,
      "unit": "months",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "recommended-use-window",
      "topic": "quality",
      "statement": "Customers are generally advised to use the product within 6 months of production. Use after that period does not affect usability, but high storage temperature or humidity, or long-term stacking, can cause slight caking and yellowing.",
      "value": 6,
      "unit": "months",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "storage-conditions",
      "topic": "storage",
      "statement": "Storage conditions: cool, dry, at or below 30 C, protected from moisture and light.",
      "value": 30,
      "unit": "degC maximum",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    },
    {
      "id": "type-test-interval",
      "topic": "quality-control",
      "statement": "A full type test covering every specification index is carried out every 6 months.",
      "value": 6,
      "unit": "months",
      "source": "Company statement",
      "verification": "supplier-declaration",
      "asOf": "2026-09-19"
    }
  ],
  "documentsAvailable": [
    "Certificate of analysis (COA), batch specific",
    "Safety data sheet (SDS)",
    "Packing list",
    "Certificate of origin",
    "Retention-sample and traceability records",
    "EHS statement for supplier qualification (on request)"
  ],
  "notPublished": [
    "Actual tonnage shipped per year",
    "List of export destinations"
  ],
  "notPublishedNote": "notPublished 列出的是我们有意不公开、而非估算的项目；notPublishedDetail 逐项说明分类（商业保密 / 未公开）；notApplicable 列出的是本产品本身没有的指标。",
  "dataSources": [
    "Company production and quality-control records",
    "ISO 9001:2015 certificate no. 05326Q00214R201",
    "ZDHC MRSL V3.1 Level 1 conformance, test report no. 178232824a 001",
    "Safety data sheet, section 14 (transport information)",
    "Published product technical specification"
  ],
  "notApplicable": [
    {
      "item": "Whiteness index (CIE or ISO)",
      "reason": "Thiourea dioxide has no whiteness index specification. Whiteness is a visual comparison for this product, not a laboratory index, so there is no index value to publish.",
      "reportedAs": "A visual comparison, also reported by customers."
    }
  ],
  "notPublishedDetail": [
    {
      "item": "Actual tonnage shipped per year",
      "category": "commercial-confidential",
      "note": "Not published. Commercial information."
    },
    {
      "item": "List of export destinations",
      "category": "commercial-confidential",
      "note": "Not published. Commercial information."
    }
  ]
}