English 
Español 
français 
العربية Search
Search
Rongalite is mainly used in the printing and dyeing industry as a discharging agent, a stripping agent, a reducing agent.
Rongalite is soluble in water, relatively stable at room temperature, easy to decompose in case of acid, alkali and high temperature, because it has strong reducing property at high temperature, so that it has a bleaching effect, is an industrial bleach.
Items | Specifications | Results |
Appearance | White crystalline powder | White crystalline powder |
Water-insoluble matter % | ≤0.1 | 0.1 |
pH Value | 9-11 | 9.3 |
Solubility | Soluble in water | Aqueous solution slightly turbid |
Sulfide test | No sulfides present | No black precipitate |
Sodium formaldehyde bisulfite % | ≥98 | 98.6 |
Conclusion | The product conforms to the above specifications. | |
Welcome to inquire us to get the complete COA
| Product parameters | |
| Cas number: | 149-44-0 |
| Appearance: | White powder |
| Purity: | 98%min |
| Package details: | 25kg/bag |
| Brand: | Fortunachem |
Uses:
Sodium hydroxymethanesulphinate (CAS 149-44-0, CH₃NaO₃S, anhydrous MW 118.09; commonly sold as the dihydrate CH₆NaO₅S·2H₂O, MW 176.13) is commonly known as rongalite / sodium formaldehyde sulfoxylate (SFS), under brand names such as Aldanil, Bruggolite and Formapon. It is a white crystalline powder or lump, freely soluble in water, stable at room temperature, with a faint garlic-like odour.
Chemically, it is a "masked" solid source of the sulfoxylate ion (SO₂²⁻). Under acidic conditions or on heating it decomposes to release strongly reducing sulfoxylate plus one equivalent of formaldehyde, so it functions both as a reducing agent and as a C1/sulphonyl-methyl transfer reagent.
Uses
Textile dyeing & printing (largest use)
Discharge printing: under alkaline steaming it destroys the chromophore conjugation of dyes, producing fine white patterns on coloured grounds; compatible with reactive, direct and sulphur dyes.
Vat dyeing: reduces indigo and anthraquinone vat dyes to the soluble leuco form for substantivity, followed by oxidation to develop colour.
Reductive clearing: removes surface dye after disperse dyeing of polyester, improving colour fastness with less fibre damage than sodium dithionite.
Polymer industry (fastest-growing use)
Reductant component of redox initiation systems in emulsion polymerisation for ABS, MBS, SBR, acrylic latices etc.; enables low-temperature initiation, giving better control of particle size, molecular-weight distribution and graft structure.
Other industrial uses
Sugar refining: bleaching/decolorisation; synthetic rubber; soap and oil/fat bleaching.
Electroplating: low-current-area brightener, cyanide-free zinc-plating auxiliary (note: this application often actually uses the sulfonate CAS 870-72-4—distinguish carefully).
Water treatment: dechlorination/dechloramination in aquaria and pools; reacts with ammonia to form aminomethanesulfonate.
Pharmaceuticals & cosmetics: water-soluble antioxidant in injectables (typically ≤0.1% w/v); reductant in hair-colour removers/bleach boosters (INCI: sodium oxymethylene sulfoxylate).
Organic synthesis: cheap metal-free reductant (α-keto esters → α-hydroxy esters), disulfide cleavage to thiols/thioethers, perfluoroalkyl radical source, and sulfonyl-methylating/C1 synthon for azacycles and dithia-heterocycles.
Selling points
| Selling point | Practical meaning |
|---|---|
| Solid, stable at ambient temperature, long shelf life | Unlike sodium dithionite ("insurance powder"), which self-heats and decomposes on air exposure, SFS has a long shelf life and lower transport/storage risk |
| Controlled release | Reducing activity is released only under alkaline + heat (steaming) conditions, so print pastes stay stable and don't pre-decompose; pattern edges stay sharp |
| Gentler on fibres | Slightly lower reducing power than dithionite but better selectivity; less tensile loss on cotton; suited to sensitive fibres and fine fabrics |
| Low-temperature initiation | In polymerisation, drops initiation temperature to room temp–50 °C, protecting heat-sensitive monomers and improving impact strength/gloss of ABS/MBS |
| Multi-functional | Combines reduction, bleaching and dechlorination, and can act as a sulfonyl-methylating/C1 reagent—fewer formulation components |
| Good water solubility, no dust spontaneous-combustion risk | Easy to make up solutions; non-flammable solid; safer and easier to handle than many sulphur-based reductants |
| Low cost, ample supply | Bulk inorganic–organic salt with large Chinese capacity; competitive price per reducing equivalent |
Caveats & compliance (must be stated)
Releases formaldehyde: heating or acid contact liberates formaldehyde and SO₂; at high temperature H₂S can also form. Formaldehyde is an IARC Group 1 carcinogen; the dihydrate is classified in the EU as germ cell mutagen category 2 (H341). Dyed/textile goods must be thoroughly washed and soaped to avoid exceeding free-formaldehyde limits (e.g., GB 18401 for textiles).
Never for food use: China and many other countries expressly prohibit it as a food additive or processing aid. It has historically been illegally used to whiten/strengthen yuba (tofu skin), vermicelli, flour and bamboo shoots—an illegal non-food substance. Ingestion can cause liver/kidney damage, CNS toxicity and carries carcinogenic risk.
Incompatibilities: do not store or use with oxidising agents or strong acids; contact with chlorine-containing disinfectants/bleaches rapidly consumes available chlorine and can generate chlorinated by-products.
Occupational & environmental: irritant to skin, eyes and respiratory tract; neutral-to-alkaline wastewater slowly release formaldehyde, and the sulfonate moiety resists biodegradation—alkaline hydrolysis pretreatment, then biological treatment, or Fenton/ozone pretreatment is typically needed.
Cosmetics restrictions: as a formaldehyde releaser it is concentration- and labelling-limited in the EU and other regions; caution for sensitive skin and formaldehyde-allergic individuals.
Also, if you have any other questions, you can contact us
FAQ From Wuhan Fortuna Chemical Co.,Ltd
Q1: Can I get a sample for free ?
A: For small QTY and low value product, we can provide sample for free exclude shipping cost. For high value sample, we will charge the basic sample cost, but we can refund all the cost if customers place order after sample test.
Q2: How to confirm the product quality before placing orders ?
A: Most of our products confirm to international standards like USP/EP/BP/JP/CP. We will provide COA/TDS/MSDS for customers to confirm the specification before placing order.
Q3: What is the payment you accept?
A: For small and low value order, we accept CreditCard, MaterCard,VISA,Western Union and T/T.For large order, we can do T/T and L/C. Any pay on delivery or pay-after are not available for us.
Q4: What is your shipment way ?
A: For less than 100kg gross weight order will ship with courier like FedEx or UPS, we support customers to place courier orders remotely by their account, we will package the goods well and wait for pick up.For more than 100kg goods, we will transport by Air or Sea according to customers' requirement.
Q5: How long is your after-sales service?
A: We accept customer’s quality complaint in three month after customer received the goods. We provide tech.support for all-life if customer place order from our company.
Q6: How do you treat quality complaint ?
A: We support customer to provide our products to any rightful third party testing organization to test our products according to the COA specification, if the test result is confirm with COA, we will take all the loss for customers.
Name:Wuhan Fortuna Chemical Co.,Ltd
Category:Others
Trade Category: Trading Company
Employees: 11 - 50 People
Address: Room 2015, No.2 Building, Kaixin Mansion No.107
Company Information: Wuhan Fortuna Chemical Co.,Ltd established in 2006, is a big integrative chemical enterprise being engaged in Pharmaceutical and Intermediates, Food and Feed additives, Fine chemicals,Biochemical and Reagent, which is the members of Hubei E-commerce Chamber.
Our company has professional persons who major in chemical R&D and sicentific management, supply fine chemical products with high quality and close service, also supply custom-tailored products according to our clients' requirement.
We have a positive and self-motivated management work team with a common philosophy, caring and commitment through teamwork, our team strive to achieve success in delighting our clients and ourselves.
Since Wuhan Fortuna Chemical Co., Ltd founded, we continuously innovate our products and improve our service, sales network. Hence, we initiate the first sale mode on net in China, which is the retail trade of small package bring along wholesale of diversified management modes. Our products are exported widely to South Korea, Vietnam, Australia, Europe and South America, highly recommended by our clients.We insist on the management creed “Market is our compass, Quality is our life, Credit is our soul”. Clients’ trust is our forward power, their satisfaction is our struggling goal.
Wuhan Fortuna Chemical Co.,Ltd is a professional manufacturer which provide Rongalite with good quality and best price, welcome to contact us to get COA/TDS/MSDS of Rongalite.
1. Guaranteed purity;
2. Large quantity in stock;
3. Largest manufacturer;
4. Best service after shipment with email;
5. High quality & competitive price;
Fortunachem Provides Not Only Professional Chemical Products But Also Professional Help
Keeping you up-to-date with all the latest information, news, and events about Fortunachem!
Quick Links
Add:
E-mail:
中文
