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Send EmailRongalit C p, Discharge and Reducing Agent, Discharge Printing Agent, Vat Printing Chemical, Discharge With Vat Dye
RONGALIT C P
CHEMICAL FORMULA AND STRUCTURE
Chemical Name
Sodium Formaldehyde Sulfoxylate
Molecular Formula
NaCH₂(OH)SO₂ or NaHSO₂·CH₂O·2H₂O
Structural Representations
| Representation Type | Formula |
|---|---|
| Chemical Name | Sodium Formaldehyde Sulfoxylate |
| Trade Name | Rongalit® C, Rongalit® C p |
| CAS Number | 149-44-0 (anhydrous) / 6035-47-8 (dihydrate) |
| EC Number | 205-739-4 |
| Molecular Formula | NaHSO₂·CH₂O·2H₂O |
| Molecular Weight | 154.10 g/mol (dihydrate) |
| Chemical Class | Sulfinic acid derivative, reducing agent |
Molecular Structure
O
||
Na⁺ S — H
|
CH₂OH
SECTION 1: PRODUCT IDENTIFICATION
| Parameter | Information |
|---|---|
| Product Name | Rongalit® C p |
| Manufacturer | Archroma |
| Chemical Name | Sodium Formaldehyde Sulfoxylate |
| Synonyms | Sodium Hydroxymethane Sulfinate, Formaldehyde Sulfoxylate |
| CAS Number | 149-44-0 (anhydrous) / 6035-47-8 (dihydrate) |
| EC Number | 205-739-4 |
| Molecular Formula | NaHSO₂·CH₂O·2H₂O |
| Molecular Weight | 154.10 g/mol (dihydrate) |
| Chemical Class | Sulfinic acid derivative |
SECTION 2: PHYSICAL AND CHEMICAL PROPERTIES
| Property | Value | Test Method |
|---|---|---|
| Appearance | White crystalline powder | Visual |
| Odor | Slightly characteristic | Olfactometric |
| Molecular Weight | 154.10 g/mol (dihydrate) | Calculated |
| pH (10% aqueous solution) | Approximately 10 | ISO 3071 |
| Solubility (20°C) | Approx. 600 g/L soluble in water | Gravimetric |
| Dissolution Characteristic | Endothermic dissolution | - |
| Decomposition Temperature | Thermal decomposition above 50°C | DSC/TGA |
| Hygroscopicity | High (absorbs moisture) | Visual |
| Storage Stability | 24 months under proper conditions | - |
| Shelf Life (Closed Container) | 24 months | - |
| Shelf Life (Opened Container) | Use quickly | - |
SECTION 3: CHEMICAL PROPERTIES AND REACTIVITY
| Parameter | Information |
|---|---|
| Chemical Character | Strong reducing agent |
| Oxidation Potential | High reducing power |
| Thermal Decomposition | Decomposition begins above 50°C; effectiveness decreases at high temperatures |
| Stability in Alkaline Media | High (pH approximately 10) |
| Stability in Acidic Media | Low (avoid contact with acids) |
| Compatibility with Oxidizers | INCOMPATIBLE (reacts) |
| Moisture Sensitivity | Hygroscopic; degrades in humid conditions |
| Reaction with Water | Soluble; endothermic dissolution |
| Decomposition Products | Formaldehyde, sulfur dioxide, sodium salts |
| Hazardous Polymerization | Does not occur |
SECTION 4: PRODUCT CLASSIFICATION AND FUNCTIONS
| Product Type | Function | Application Purpose |
|---|---|---|
| Rongalit® C p | Reducing Agent | Reduction of dyestuffs |
| Reductive Agent | Reducing Agent | Conversion of vat dyes to soluble form |
| Discharge Printing Agent | Discharge Agent | White or colored discharge on dyed ground |
| Vat Print Reductant | Vat Dye Reductant | Direct and two-stage printing with vat dyes |
SECTION 5: MAIN APPLICATION AREAS
5.1 Direct Printing with Vat Dyes
| Parameter | Value |
|---|---|
| Application | Direct printing with vat dyes |
| Steaming Temperature | 102°C |
| Steaming Duration | 8-12 minutes |
| Atmosphere | Saturated steam (air-free) |
Stock Thickener Recipe:
| Component | Quantity |
|---|---|
| Thickener | 550 g |
| Glycerin | 30-50 g |
| Potash or Soda Ash | 130 g (Potash) / 100 g (Soda Ash) |
| Rongalit® C p | 130 g |
| Water or Thickener | Make up to 1000 g |
Print Color Composition:
| Component | Quantity |
|---|---|
| Vat Dye (printing grade) | X g |
| Stock Thickener | 650 g |
| Water or Thickener | Make up to 1000 g |
5.2 Colored Discharge Printing with Vat Dyes
| Parameter | Value |
|---|---|
| Application | Dischargeable dyed cellulosic fibers |
| Rongalit® C p Quantity | Can be increased depending on ground color |
| Alkali Quantity | Can be increased with potash or soda ash |
5.3 White Discharge Printing
Paste A (For easily dischargeable dyes):
| Component | Quantity |
|---|---|
| Thickener | 500 g |
| Rongalit® C p | 150 g |
| Discharge-Resistant Optical Brightener | 10 g |
| Water or Thickener | Make up to 1000 g |
Paste B (For difficult-to-discharge dyes):
| Component | Quantity |
|---|---|
| Thickener | 500 g |
| Rongalit® C p | 200 g |
| Discharge-Resistant Optical Brightener | 10 g |
| Caustic Soda 38°Bé or Soda Ash | 40 g |
| Water or Thickener | Make up to 1000 g |
Process Conditions:
| Parameter | Value |
|---|---|
| Steaming Temperature | 102°C |
| Steaming Duration | 8-10 minutes |
| Atmosphere | Saturated steam (air-free) |
5.4 Two-Stage Printing Process with Vat Dyes
| Parameter | Value |
|---|---|
| Rongalit® C p Usage | 100 g |
| Steaming Temperature | 110°C-115°C |
| Steaming Duration | 5-7 minutes |
| Atmosphere | Saturated or slightly superheated steam |
| Finishing Processes | Rinsing → Alkaline reoxidation → Boiling soaping |
SECTION 6: APPLICATION PARAMETERS SUMMARY
| Application Type | Rongalit® C p Quantity | Steaming Temperature | Steaming Duration | Atmosphere |
|---|---|---|---|---|
| Direct Printing | 130 g | 102°C | 8-12 min | Saturated steam (air-free) |
| White Discharge (Easy) | 150 g | 102°C | 8-10 min | Saturated steam (air-free) |
| White Discharge (Difficult) | 200 g | 102°C | 8-10 min | Saturated steam (air-free) |
| Two-Stage Printing | 100 g | 110-115°C | 5-7 min | Saturated/superheated steam |
SECTION 7: ADVANTAGES AND COMPATIBILITY NOTES
Advantages
| Advantage | Description |
|---|---|
| High Solubility | Soluble up to 600 g/L at 20°C |
| Excellent Stability | Stable for 24 months under proper storage |
| Strong Reduction | Effective reduction of vat dyes |
| Versatile Application | Direct printing, discharge, two-stage processes |
| Stable in Alkaline Media | Optimum performance at pH ~10 |
Compatibility Notes
| Compatibility | Status |
|---|---|
| Vat Dyes | Compatible |
| Reactive Dyes | Compatible (dosage increased for difficult-to-discharge types) |
| Naphthol Combinations | Compatible |
| Oxidizing Agents | INCOMPATIBLE |
| Acids | INCOMPATIBLE |
| Moisture | Sensitive (hygroscopic) |
SECTION 8: STORAGE AND USAGE WARNINGS
| Parameter | Information |
|---|---|
| Storage Conditions | Dry, cool, well-ventilated area |
| Storage Temperature | Below 25°C (acid-free and protected from moisture) |
| Container Requirements | Tightly closed, original packaging |
| Materials to Protect From | Moisture, acids, oxidizers, high heat |
| Shelf Life | 24 months (under proper storage conditions) |
| Opened Containers | Use quickly; close properly |
| Hygroscopicity | High; degrades in humid conditions |
SECTION 9: HEALTH AND SAFETY INFORMATION
| Parameter | Information |
|---|---|
| Skin Contact | May cause irritation; use protective gloves |
| Eye Contact | Irritant; use protective goggles |
| Inhalation | Avoid breathing dust |
| Ingestion | Harmful; seek medical attention if swallowed |
| Decomposition Products | Formaldehyde, sulfur dioxide |
| First Aid | Inhalation: Move to fresh air. Skin: Wash with plenty of water. Eyes: Rinse with plenty of water. Ingestion: Rinse mouth; do NOT induce vomiting |
SECTION 10: GHS CLASSIFICATION AND LABELING
GHS Classification (compliant):
| Hazard Class | Category | H-Phrase |
|---|---|---|
| Acute Toxicity (Oral) | Category 4 | H302 |
| Skin Irritation | Category 2 | H315 |
| Eye Irritation | Category 2 | H319 |
| Respiratory Irritation | Category 3 | H335 |
| Aquatic Toxicity | Category 3 | H412 |
Signal Word: WARNING
Hazard Pictograms: GHS07 (Exclamation Mark)
Hazard Statements (H-Codes):
| Code | Statement |
|---|---|
| H302 | Harmful if swallowed |
| H315 | Causes skin irritation |
| H319 | Causes serious eye irritation |
| H335 | May cause respiratory irritation |
| H412 | Harmful to aquatic life with long lasting effects |
SECTION 11: PRECAUTIONARY STATEMENTS (P-CODES)
| Code | Statement |
|---|---|
| P261 | Avoid breathing dust |
| P280 | Wear protective gloves/protective clothing/eye protection |
| P302+P352 | IF ON SKIN: Wash with plenty of soap and water |
| P305+P351+P338 | IF IN EYES: Rinse cautiously with water for several minutes |
| P402+P404 | Store in a dry place. Store in a closed container |
SECTION 12: CRITICAL WARNINGS AND BEST PRACTICES
CRITICAL WARNINGS:
Thermal Decomposition: Thermal decomposition begins above 50°C; effectiveness decreases at high temperatures.
Moisture Sensitivity: Hygroscopic; degrades and loses effectiveness in humid conditions.
Acid Incompatibility: Decomposes upon contact with acids and loses effectiveness.
Oxidizer Incompatibility: Violent reaction with oxidizing agents.
Steaming Control: Air-free conditions (oxygen-free) required; oxygen presence reduces reduction effectiveness.
Formaldehyde Release: Releases formaldehyde during decomposition; ensure adequate ventilation.
BEST PRACTICE RECOMMENDATIONS:
Storage: Store in dry, cool (below 25°C), acid-free, oxidizer-free environment in original sealed packaging.
Proper Solution Preparation: Prepare at recommended temperature and in correct addition sequence.
Steaming Duration: Steam at appropriate time and temperature according to application type.
Oxygen-Free Atmosphere: Use air-free steaming for optimum results.
Safety: Use PPE (gloves, goggles, mask); avoid breathing dust.
LEGAL DISCLAIMER:
The information provided in this document is based on our current knowledge and experience and is presented in good faith; however, as all conditions of use are beyond our control, it does not constitute a binding specification or warranty. This Technical Data Sheet is for informational purposes only. Users are responsible for testing the suitability for their own applications. Rongalit® is a registered trademark of Archroma. For complete safety, storage, use, handling, disposal, and regulatory compliance information, please refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier.
