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Send EmailRongalit D p, Reducing Agent For Printing, Discharge Agent, Textile Printing Discharge Agent, White, Color Discharge Printing Agent
Zinc Formaldehyde Sulfoxylate (Zinc Hydroxymethane Sulfinate)
Zn(HSO₂·CH₂O)₂ or C₂H₆O₆S₂Zn
| Representation Type | Formula |
|---|---|
| Chemical Name | Zinc Formaldehyde Sulfoxylate |
| Trade Name | Rongalit® D, Rongalit® D p |
| CAS Number | 24887-06-7 |
| EC Number | 246-513-0 |
| Molecular Formula | Zn(HSO₂·CH₂O)₂ |
| Molecular Weight | 255.6 g/mol |
| Chemical Class | Sulfinic acid derivative, zinc salt, reducing agent |
O O
|| ||
Na⁺ S — H H — S Na⁺
| |
CH₂OH CH₂OH
(Zn²⁺ bridge)
| Parameter | Information |
|---|---|
| Product Name | Rongalit® D p |
| Manufacturer | Archroma |
| Chemical Name | Zinc Formaldehyde Sulfoxylate |
| Synonyms | Zinc Hydroxymethane Sulfinate, Zinc Sulfoxylate Formaldehyde |
| CAS Number | 24887-06-7 |
| EC Number | 246-513-0 |
| Molecular Formula | Zn(HSO₂·CH₂O)₂ |
| Molecular Weight | 255.6 g/mol |
| Chemical Class | Sulfinic acid derivative, zinc salt |
| Property | Value | Test Method |
|---|---|---|
| Appearance | White crystalline powder | Visual |
| Odor | Slightly characteristic | Olfactometric |
| Molecular Weight | 255.6 g/mol | Calculated |
| pH (10% aqueous solution) | Approximately 4.4 | ISO 3071 |
| Solubility (20°C) | Good solubility in water | Gravimetric |
| Storage Stability (Closed Containers) | Minimum 12 months (0°C to 40°C) | - |
| Shelf Life (Opened Containers) | Keep closed; use quickly | - |
| Decomposition Temperature | >50°C (thermal decomposition) | DSC/TGA |
| Hygroscopicity | Moderate | Visual |
| Parameter | Information |
|---|---|
| Chemical Character | Strong reducing agent (discharge/reductive agent) |
| Oxidation Potential | High reducing power |
| pH Behavior | Acidic in solution (pH ~4.4) |
| Stability in Acidic Media | Limited stability |
| Stability in Alkaline Media | Limited stability |
| Compatibility with Oxidizers | INCOMPATIBLE (reacts violently) |
| Compatibility with Acids | INCOMPATIBLE (decomposes) |
| Heavy Metal Sensitivity | Use only with heavy metal-resistant thickeners |
| Thermal Decomposition | Decomposition begins above 50°C |
| Decomposition Products | Formaldehyde, sulfur dioxide, zinc salts |
| Hazardous Polymerization | Does not occur |
| Product Type | Function | Application Purpose |
|---|---|---|
| Rongalit® D p | Reductive Discharge Agent | White and colored discharge printing |
| White Discharge Agent | Discharge Agent | White discharge on dyed synthetic, wool, and silk fabrics |
| Colored Discharge Agent | Discharge Agent | Colored discharge printing on polyamide, wool, silk with acid dyes |
| Discharge-Resistant Agent | Protective Agent | Discharge-resistant printing on polyester and triacetate |
| Fiber Type | Application | Conditions |
|---|---|---|
| Polyester | White Discharge | Superheated steam at 175°C, 15 min |
| Polyester | Discharge-Resistant | Superheated steam at 175°C, 6-8 min |
| Polyamide | White Discharge | Saturated steam at 102°C, 8-12 min |
| Triacetate | White Discharge | Pressure steaming (2.2 bar, 20 min) or superheated steam (175°C, 8 min) |
| Polyacrylonitrile | White Discharge | Saturated steam at 102°C, 8-12 min or pressure steaming (1.2 bar, 20 min) |
| Wool | White Discharge | Saturated steam at 102°C, 10-20 min |
| Silk | White Discharge | Saturated steam at 102°C, 10-20 min |
| Acetate/Triacetate/Polyamide Blends | Discharge | Depends on blend composition |
Standard Recipe:
| Component | Quantity | Function |
|---|---|---|
| Heavy Metal-Resistant Thickener (10-14% solution) | 450 g | Base thickener |
| Pluriol® E 300 | 50-80 g | Improves discharge effect and color yield |
| Ultraphor® RN Plus liq | 10 g | Enhances white effect |
| Rongalit® D p | 20-250 g | Reductive discharge agent |
| Ammonium Chloride | 20 g | Activator |
| Suitable Antifoaming Agent | X g | Foam control |
| Water or Thickener | Make up to 1000 g | - |
| Parameter | Value |
|---|---|
| Rongalit® D p Quantity | 150-250 g |
| Steaming | 102°C, 8-12 min (saturated steam) or 1.2 bar, 20 min (pressure steam) |
| Parameter | Value |
|---|---|
| Application | Polyamide, wool, silk |
| Dye Type | Acid dyes |
| Discharge Mechanism | Rongalit® D p destroys ground color; acid dyes remain |
| Fiber Type | Process | Temperature | Duration | Steam Type |
|---|---|---|---|---|
| Polyester | Discharge | 175°C | 15 min | Superheated Steam |
| Polyester | Discharge-Resistant | 175°C | 6-8 min | Superheated Steam |
| Polyamide | Discharge | 102°C | 8-12 min | Saturated Steam |
| Triacetate | Discharge | 2.2 bar | 20 min | Pressure Steam |
| Triacetate | Discharge | 175°C | 8 min | Superheated Steam |
| Polyacrylonitrile | Discharge | 102°C | 8-12 min | Saturated Steam |
| Polyacrylonitrile | Discharge | 1.2 bar | 20 min | Pressure Steam |
| Wool | Discharge | 102°C | 10-20 min | Saturated Steam |
| Silk | Discharge | 102°C | 10-20 min | Saturated Steam |
| Step | Process | Conditions |
|---|---|---|
| 1 | Printing | Apply discharge paste to fabric |
| 2 | Drying | Gentle drying |
| 3 | Steaming | 102°C, 6-10 min (saturated steam, air-free) or as per specific conditions |
| 4 | Baking (Optional) | 150°C, 5 min (hot air) |
| 5 | Cold Rinsing | Thorough cold rinsing |
| 6 | Oxidative Aftertreatment | Hydrogen peroxide (2 ml/L) at 40-60°C |
| 7 | Soaping | Kieralon® washing agent at 60-70°C |
| 8 | Thorough Washing | Complete removal of thickener residues |
| 9 | Drying | Standard drying |
| 10 | Finishing | Standard finishing |
| Note | Description |
|---|---|
| Compatibility | Rongalit® D p can only be used with thickeners resistant to heavy metal salts |
| Residue Prevention | Thickener residues can cause fabric stiffening |
| Recommended Additive | Add Lufibrol® TA liq (1-2 g/l) during washing or reduction bath to prevent stiffening |
| Note | Description |
|---|---|
| Effect of Rongalit® D p | Addition generally increases viscosity of printing pastes |
| Benefit | Reduced need for additional thickener |
| Adjustment | Adjust viscosity as needed |
| Note | Description |
|---|---|
| Critical Factor | Careful dye selection required for dischargeable grounds |
| Conditions | Proper dyeing conditions essential for good dischargeability |
| Testing | Pre-test dye selection before production |
| Advantage | Description |
|---|---|
| Versatile Application | Suitable for multiple fiber types (polyester, polyamide, wool, silk, acrylic) |
| Effective Discharge | Strong reducing power for white and colored discharge |
| Good Solubility | Good solubility in water |
| Viscosity Effect | Increases paste viscosity, reducing thickener requirements |
| Dye Compatibility | Suitable for colored discharge with acid dyes |
| Limitation | Description |
|---|---|
| Thickener Restriction | Only compatible with heavy metal-resistant thickeners |
| Temperature Sensitivity | Thermal decomposition above 50°C; store below 40°C |
| Incompatibility | Cannot be used with acids or oxidizers |
| Residue Risk | Improper washing leaves thickener residues causing fabric stiffness |
| Limited Shelf Life | 12 months shelf life (shorter than Rongalit® C p) |
| Property | Rongalit® C p | Rongalit® D p |
|---|---|---|
| Chemical Basis | Sodium Formaldehyde Sulfoxylate | Zinc Formaldehyde Sulfoxylate |
| pH (10% solution) | ~10 (Alkaline) | ~4.4 (Acidic) |
| Primary Application | Cellulosic fibers (cotton, viscose) | Synthetic fibers (polyester, polyamide), wool, silk |
| Discharge Type | White/Colored discharge on cellulosics | White/Colored discharge on synthetics |
| Storage Stability | 24 months | 12 months |
| Viscosity Effect | Moderate | Significant increase |
| Thickener Requirement | Standard | Heavy metal-resistant only |
| 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, zinc salts |
| 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 |
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 |
| 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 |
| Parameter | Information |
|---|---|
| Storage Temperature | 0°C to 40°C |
| Storage Conditions | Cool, dry, well-ventilated area |
| Container Requirements | Tightly closed, original packaging |
| Materials to Protect From | Acids, oxidizers, moisture, heat above 40°C |
| Shelf Life (Closed Container) | Minimum 12 months |
| Shelf Life (Opened Container) | Keep closed; use quickly |
| Stability Note | Shorter shelf life than Rongalit® C p; use FIFO system |
Thickener Restriction: Rongalit® D p can only be used with thickeners resistant to heavy metal salts. Using incompatible thickeners will cause precipitation and poor results.
Acid Incompatibility: Decomposes upon contact with acids; loses effectiveness.
Oxidizer Incompatibility: Violent reaction with oxidizing agents.
Temperature Sensitivity: Thermal decomposition above 50°C; store below 40°C; do not overheat during drying.
Residue Prevention: Thickener residues cause fabric stiffness; ensure thorough washing with Lufibrol® TA liq (1-2 g/l).
Fiber-Specific Conditions: Different fibers require specific steaming conditions; follow recommended parameters for each fiber type.
Storage: Store in cool, dry (0°C-40°C), acid-free, oxidizer-free environment in original sealed packaging.
Thickener Selection: Use only heavy metal-resistant thickeners; test compatibility before production.
Viscosity Adjustment: Account for viscosity increase when adding Rongalit® D p; adjust thickener content accordingly.
Dye Selection: Pre-test dyes for dischargeability; select appropriate dyes for dischargeable grounds.
Steaming: Follow fiber-specific steaming conditions (temperature, time, steam type).
Washing: Thorough washing with Lufibrol® TA liq is essential to prevent fabric stiffness.
Safety: Use PPE (gloves, goggles, mask); avoid breathing dust; avoid contact with acids and oxidizers.
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®, Pluriol®, Ultraphor®, and Lufibrol® are registered trademarks 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.