Thiourea Dioxide Manufacturer & Industrial Chemical Supplier
Dasteck is a specialized manufacturer of Thiourea Dioxide (TDO, CAS 1758-73-2) based in Yantai, China. We supply consistent, high-purity products with full batch traceability, temperature-controlled storage and complete documentation (TDS, SDS, COA).
Since 1983 | 10,000 tonnes annual capacity | ISO 9001:2015 Reliable TDO and reducing agents for textile and pulp & paper applications worldwide
1. Check the specification → 2. Download the TDS → 3. Request a sample → 4. Confirm your quote
Thiourea Dioxide: Quick Answers
See all FAQ →What is Thiourea Dioxide?
Thiourea Dioxide (TDO, CAS 1758-73-2) is a sulfur-containing reducing agent used for textile reduction clearing and stripping. For pulp and paper applications, Dasteck supplies a separate paper-grade FAS product line.
Who manufactures Dasteck TDO?
Yantai Dasteck Chemicals Co., Ltd. has produced Thiourea Dioxide since 1983 and publishes a designed capacity of 10,000 tonnes per year.
How can buyers request TDS, COA or a sample?
Use the RFQ form to request the current TDS, SDS, batch COA, sample or quotation. Include the product, application, quantity and destination.
Is paper-grade FAS the same as TDO?
They share the same confirmed chemical identity and CAS No. 1758-73-2, but Dasteck supplies TDO and paper-grade FAS as separate commercial grades and product lines.
Verified product identity and standards: Thiourea Dioxide (CAS No. 1758-73-2) — CAS Common Chemistry · PubChem CID 61274 · ECHA substance record · quality system ISO 9001:2015 · industry standard HG/T 3258.
Dasteck’s Thiourea Dioxide standard was adopted as China’s industry standard in 1989, and the company took part in the HG/T 3258 revisions issued in 2001 and 2010.
Find the right product by application
Textile Reducing Solutions
Reduction clearing, dye stripping and dyehouse cleaning for polyester and synthetic fibres.
Pulp & Paper Solutions
Paper-grade FAS for deinked pulp bleaching and mechanical pulp brightness improvement.
Request Support
Tell us your process and target. Our technical team will recommend the right grade and trial plan.
Why Choose Dasteck
Manufacturer Direct
Own production in Yantai, with full batch traceability from raw-material inspection through shipment.
Consistent Quality
Automated process control, in-house testing and batch-level safety performance testing before dispatch.
Controlled Storage & Handling
Automated drying with controlled heat exposure and temperature-controlled finished-goods storage.
Complete Documentation
COA, SDS, TDS, packing list and required export documents, with published certificate and report numbers.
Global Supply
Dangerous-goods export capability and worldwide shipping support, subject to destination-country requirements.
Industry Experience
TDO production since 1983 and participation in the HG/T 3258 industry standard development.
See how we control quality → · Review the transparency page →
Evidence, documents and samples
Inside the plant
Get the documents before you commit
Buyer Guides
See all technical FAQ →How to evaluate a thiourea dioxide supplier
Specification, impurity control, batch consistency, documentation, export capability and sample testing in one checklist.
TDO vs sodium hydrosulfite
Where TDO reduces chemical consumption, where it does not, and how to calculate the real cost per tonne of fabric or pulp.
Dosage and process conditions
Starting points for polyester reduction clearing, with troubleshooting notes and links to the paper-grade FAS guide.
Latest Technical Q&A
Recent questions on Thiourea Dioxide and reducing-agent applications.
- Thiourea dioxide vs sodium hydrosulfite
- Safe handling and storage
- Polyester reduction clearing
- FAS deinking for pulp
- What is FAS?
- Transport classification
- Supplier evaluation buyer guide
- samples for qualified evaluation
These answers explain TDO and paper-grade FAS grade boundaries, safe handling and storage, reduction-clearing starting points, pulp deinking applications, transport classification and the documents buyers should review during supplier evaluation. For project-specific guidance, send the substrate, process conditions, target result and destination country so our technical team can recommend the correct grade and trial plan.
Need TDS, COA, a sample or a quotation?
Send us the product, application, quantity and destination port. Our export team will reply with price, lead time and the documents you need.