Dasteck ChemicalsYantai Dasteck Chemicals Co., Ltd.
With over 40 years of experience producing thiourea dioxide (TDO) since 1983, our annual production capacity is 10,000 tons. We serve the textile, pulp and paper, and specialty chemical industries. Our products are exported globally. We are ISO9001 certified and a participating drafter of the Chinese thiourea dioxide industry standard (HG/T 3258-2010).
Thiourea Dioxide for reductive cleaning after disperse-dyeing polyester, stripping/reworking reactive dyes, and cleaning dye houses / printing screens — replacing sodium hydrosulfite with better wash fastness and lower dosage.
FAS for reductive bleaching of deinked pulp (DIP), secondary fiber and mechanical pulp — mild and efficient.
Thiourea for copper recovery from PCB etching waste, precious-metal flotation collectors; Dicyandiamide for specialty epoxy curing.
CAS 1758-73-2 | High-efficiency eco-friendly reducing agent for textile and paper applications; the green alternative to sodium hydrosulfite.
Reductive clearing for disperse dyes and machine cleaning; high reduction potential, low dosage, odorless.
Versatile fibre auxiliary that both bleaches and strips; mild reaction, less fibre damage and strength loss.
High-performance reduction clearing agent for dyeing and printing; better wash fastness, stable in storage, colourless and odorless.
Dedicated paper-grade reducing agent for pulp bleaching and waste-paper deinking.
CAS 62-56-6 | Multi-purpose industrial chemical: pharmaceutical intermediate, rubber vulcanization accelerator, mining flotation agent, and textile/paper treating agent.
CAS 461-58-5 | Chemical intermediate: epoxy curing accelerator, wet-strength resin raw material, pharma and dye intermediate.
Thiourea dioxide (TDO) has a low entry threshold, but it is not easy to do it professionally: the product itself tends to decompose, and where quality control falls short, accidents follow. Dasteck has built its position on the strictest process control and highly sophisticated equipment — and it is on that foundation that we have grown into one of the most advanced producers in the industry.
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.
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.
Our entire production line runs on fully automatic control equipment, among the most advanced in the industry, ensuring accuracy, consistency and stability at every stage of process control.
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.
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.
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.
Finished goods are held in a constant-temperature environment to preserve product stability.
Every lot is tracked from raw material through to shipment, and a retention sample is kept for each batch for convenient tracking and traceability.
COA, SDS, packing list and certificates accompany every batch.
Automated process control and strict EHS management have delivered decades of operation without a single accident.
Manufacturing capability, published openly
Annual production capacity for thiourea dioxide: 10,000 tonnes per year from 5 automated production lines, each rated at 2,000 tonnes per year. Capacity is available to serve large customers, including orders with an urgent delivery requirement.
Our in-house fully automated drying line dries the product in a very short time. Because the product is exposed to heat only briefly, it decomposes less and is more stable than comparable products from other producers.
Finished goods are held in a 25 °C constant-temperature warehouse. Customer storage: cool, dry, at or below 30 °C, protected from moisture and light. Shelf life 12 months; we recommend use within 6 months.
Complete and strict testing from quality through to stability, including a dedicated safety performance test. A batch that fails is not released, and a retention sample is kept for every batch.
UN 3341, Class 4.2 self-heating substance, packing group III. UN-approved packaging, dangerous-goods marking and labelling, and IMDG-compliant sea-freight documentation.
Automated process control, per-batch safety performance testing and strict EHS management.