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Send EmailDibenzothiazyl Disulfide, Benzothiazole Disulfide, MBTS, MBTS-75, MBTS75, 120-78-5
DIBENZOTHIAZYL DISULFIDE (MBTS)
PRODUCT IDENTIFIER INFORMATION
| Parameter | Information |
|---|---|
| Product Name | Dibenzothiazyl Disulfide (MBTS) |
| Chemical Name (IUPAC) | 2,2'-Dithiobis(benzothiazole) |
| CAS Number | 120-78-5 |
| EC Number (EINECS) | 204-424-9 |
| Molecular Formula | C₁₄H₈N₂S₄ |
| Molecular Weight | 332.49 g/mol |
SECTION 1: CHEMICAL IDENTITY AND DESCRIPTION
| Parameter | Information |
|---|---|
| Chemical Name (IUPAC) | 2,2'-Dithiobis(benzothiazole) |
| Systematic Name | Benzothiazyl Disulfide; Di(benzothiazol-2-yl) Disulfide |
| Synonyms | Dibenzothiazyl Disulfide, MBTS, MBTS-75 (masterbatch), Benzothiazole Disulfide, 2,2'-Dithiobis(benzothiazole), Altax, Vulkacit DM, Perkacit MBTS, Naugex MBTS |
| Trade Names | Altax, Vulkacit DM, Perkacit MBTS, Naugex MBTS, Accel M |
| Abbreviations | MBTS, MBTS-75 (75% masterbatch form) |
| CAS Number | 120-78-5 |
| EC Number (EINECS) | 204-424-9 |
| Molecular Formula | C₁₄H₈N₂S₄ |
| Molecular Weight | 332.49 g/mol |
| Chemical Class | Thiazole disulfide (medium-fast accelerator for rubber vulcanization) |
| Physical State (20°C) | Solid (beige to yellow granules or powder) |
| Odor | Characteristic slight |
| Taste | Not applicable (industrial rubber additive) |
SECTION 2: PHYSICAL AND CHEMICAL PROPERTIES
| Property | Value | Test Method |
|---|---|---|
| Appearance | Beige to yellow granules or powder | Visual |
| Odor | Characteristic slight | Olfactometric |
| Molecular Weight | 332.49 g/mol | Calculated |
| Melting Point | 170 – 180°C | DSC |
| Density (25°C) | ~1.27 g/cm³ (MBTS-75: ~1.27 g/cm³) | ASTM D4052 |
| Solubility in Water | Insoluble | General Method |
| Solubility in Organic Solvents | Soluble in chloroform, carbon disulfide; slightly soluble in ethanol, acetone, benzene | General Method |
| Active Content (MBTS-75) | 75% (25% elastomer binder and dispersing agents) | TGA |
| Stability | Stable under normal conditions | |
| Flash Point | >200°C | ASTM D93 |
SECTION 3: CHEMICAL PROPERTIES AND REACTIVITY
| Parameter | Information |
|---|---|
| Chemical Character | Thiazole disulfide; medium-fast primary accelerator for sulfur vulcanization |
| Stability | Stable under normal conditions |
| Decomposition Products (Heating) | CO, CO₂, NOx, SOx |
| Incompatible Materials | Strong oxidizing agents, strong acids |
| Activation Mechanism | Cleaves at disulfide bond upon heating; releases 2-mercaptobenzothiazole (MBT) which acts as active accelerator |
| Secondary Function | Retarder in sulfur-free or low-sulfur polychloroprene cure systems and peroxide cures |
| Activator Role | Functions as activator when used with delayed-action accelerators (e.g., CBS, sulfenamides) |
| Hazardous Polymerization | Does not occur |
SECTION 4: RUBBER ACCELERATORS COMPARISON
| Property | MBTS | MBT | CBS | TBBS | ZDEC |
|---|---|---|---|---|---|
| CAS Number | 120-78-5 | 149-30-4 | 95-33-0 | 95-31-8 | 14324-55-1 |
| Chemical Class | Thiazole Disulfide | Thiazole | Sulfenamide | Sulfenamide | Dithiocarbamate |
| Acceleration Speed | Medium-fast | Medium-fast | Fast (delayed) | Fast (delayed) | Ultra-fast |
| Processing Safety | Good | Good | Excellent | Excellent | Low (scorch risk) |
| Heat/Aging Resistance | Excellent | Good | Good | Good | Good |
| Nitrosamine Risk | No | No | Low | Low | Low |
| Primary Use | General rubber, tires, hoses, belts | General rubber | Tires, mechanical goods | Tires, mechanical goods | Latex, low-temp cure |
| Vulcanization Temperature | 140-170°C | 140-160°C | 140-180°C | 140-180°C | 80-120°C |
| Typical Dosage (phr) | 1.0-3.0 | 1.0-3.0 | 1.0-3.0 | 1.0-3.0 | 0.5-2.0 |
SECTION 5: FUNCTIONAL PROPERTIES AND MECHANISM OF ACTION
| Property | Description |
|---|---|
| Primary Accelerator | Efficient medium-fast accelerator for natural and synthetic rubber vulcanization |
| Heat and Aging Resistance | Provides excellent heat resistance and aging resistance in rubber products |
| Activator Function | Acts as activator when used with delayed-action accelerators (CBS, sulfenamides); enhances overall cure efficiency |
| Retarder in CR (Polychloroprene) | Used as retarder in sulfur-free or low-sulfur polychloroprene cure systems and peroxide cures |
| Wide Compatibility | Compatible with NR, SBR, NBR, BR, IIR, and other general-purpose elastomers |
| Good Processing Safety | Lower scorch risk compared to dithiocarbamate ultra-accelerators; suitable for compounds requiring longer processing times |
| Disulfide Bond Cleavage | Upon heating, disulfide bond cleaves releasing active MBT which acts as the actual accelerator |
SECTION 6: PRIMARY APPLICATION AREAS
| Sector / Application | Function | Typical Dosage (phr) |
|---|---|---|
| Tires (Bias and Radial) | Primary accelerator or activator with sulfenamides | 1.0 – 3.0 |
| Hoses | Primary accelerator, heat/aging resistance | 1.0 – 2.5 |
| Belts (Conveyor, Transmission) | Primary accelerator | 1.0 – 2.5 |
| Rubber Footwear | Primary accelerator | 1.0 – 2.0 |
| General Industrial Rubber Goods | Primary accelerator or activator | 1.0 – 3.0 |
| Natural Rubber (NR) Compounds | Primary accelerator | 1.0 – 3.0 |
| SBR, NBR Compounds | Primary accelerator | 1.0 – 3.0 |
| Polychloroprene (CR) Cure Systems | Retarder (sulfur-free/low-sulfur systems) | 0.5 – 1.5 |
| Peroxide Cure Systems | Retarder | 0.5 – 1.0 |
SECTION 7: QUALITY SPECIFICATIONS (TECHNICAL GRADE / MBTS-75 MASTERBATCH)
| Parameter | Specification | Test Method |
|---|---|---|
| Appearance | Beige to yellow granules | Visual |
| Active Content (MBTS-75) | 74 – 76% | TGA / HPLC |
| Free MBT | ≤ 2.0% | Titrimetric / HPLC |
| Melting Point (Pure MBTS) | 170 – 180°C | DSC |
| Loss on Drying (105°C, 2 hours) | ≤ 1.0% | Gravimetric |
| Ash Content (Pure MBTS) | ≤ 0.5% | Gravimetric (600°C) |
| Residue on Sieve (100 mesh) | ≤ 0.5% | Sieve Analysis |
| Binder Content (MBTS-75) | 24 – 26% (EPDM/EVA binder) | Calculated |
| Heavy Metals (as Pb) | ≤ 10 ppm | ICP-MS |
| Lead (Pb) | ≤ 2 ppm | ICP-MS |
| Cadmium (Cd) | ≤ 1 ppm | ICP-MS |
SECTION 8: TOXICOLOGICAL PROFILE
| Parameter | Value |
|---|---|
| Acute Oral Toxicity (LD50, Rat) | > 5,000 mg/kg (low toxicity) |
| Skin Irritation | Mild irritant |
| Eye Irritation | Mechanical irritant (dust) |
| Respiratory Irritation | Inhalation of dust may cause mechanical irritation |
| Skin Sensitization | May cause sensitization in sensitive individuals |
| Carcinogenicity | Not classified |
| Mutagenicity | Negative in standard tests |
| Environmental Toxicity | Harmful to aquatic organisms |
SECTION 9: GHS CLASSIFICATION AND LABELING
GHS Classification (compliant with 1272/2008/EC):
| Hazard Class | Category | H-Statement |
|---|---|---|
| Skin Irritation | Category 2 | H315 |
| Eye Irritation | Category 2 | H319 |
| Skin Sensitization | Category 1 | H317 |
| STOT - SE | Category 3 | H335 |
| Aquatic Toxicity (Chronic) | Category 3 | H412 |
Signal Word: WARNING
Hazard Pictograms: GHS07 (Exclamation Mark)
Hazard Statements (H-Codes):
| Code | Statement |
|---|---|
| H315 | Causes skin irritation |
| H317 | May cause an allergic skin reaction |
| H319 | Causes serious eye irritation |
| H335 | May cause respiratory irritation |
| H412 | Harmful to aquatic life with long lasting effects |
SECTION 10: PRECAUTIONARY STATEMENTS (P-CODES)
| Code | Statement |
|---|---|
| P261 | Avoid breathing dust |
| P264 | Wash hands thoroughly after handling |
| P272 | Contaminated work clothing should not be allowed out of the workplace |
| P280 | Wear protective gloves/eye protection |
| P302+P352 | IF ON SKIN: Wash with plenty of water and soap |
| P304+P340 | IF INHALED: Remove person to fresh air and keep comfortable for breathing |
| P305+P351+P338 | IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present |
| P333+P313 | If skin irritation or rash occurs: Get medical advice/attention |
| P501 | Dispose of contents/container to approved hazardous waste facility |
SECTION 11: FIRST AID MEASURES
| Exposure Route | Action to Take |
|---|---|
| Inhalation | Move to fresh air. Seek medical attention if respiratory irritation persists. |
| Skin Contact | Wash with plenty of water and soap for at least 15 minutes. Remove contaminated clothing. Seek medical attention if irritation or rash develops. |
| Eye Contact | Rinse immediately with plenty of water for at least 15 minutes. Remove contact lenses if present. Seek medical attention. |
| Ingestion | Rinse mouth with water. Do NOT induce vomiting. Drink plenty of water. Seek medical attention. |
SECTION 12: FIREFIGHTING MEASURES
| Parameter | Information |
|---|---|
| Fire Hazard | Combustible organic powder |
| Hazards During Fire | CO, CO₂, NOx, SOx |
| Suitable Extinguishing Media | Water mist, CO₂, dry chemical powder, foam |
| Special Protective Equipment | Self-contained breathing apparatus (SCBA), full protective clothing |
| Special Precautions | Prevent dust accumulation; avoid sparks |
SECTION 13: STORAGE AND SHELF LIFE
| Parameter | Information |
|---|---|
| Storage Conditions | Cool (15-25°C), dry, well-ventilated area; protect from direct light |
| Container Requirements | Tightly closed, moisture-proof containers |
| Keep Away From | Strong oxidizing agents, strong acids, heat sources |
| Shelf Life | 24 months (unopened original packaging under appropriate storage conditions) |
| Stability Note | Stable under normal conditions |
SECTION 14: PACKAGING OPTIONS
| Packaging Type | Quantity | Material |
|---|---|---|
| Kraft bag with PE inner liner | 25 kg | Kraft paper + PE |
| PP woven bag with PE inner liner | 25 kg | PP woven + PE |
| Fiber drum | 25-50 kg | Fiberboard + PE |
| Big-Bag | 500-1000 kg | Polypropylene (with PE inner liner) |
SECTION 15: TRANSPORTATION INFORMATION
| Parameter | Information |
|---|---|
| UN Number | Not regulated (not hazardous for transport) |
| Hazard Class | Not applicable |
| Packing Group | Not applicable |
| ADR/RID | Not regulated |
| IMDG Code | Not regulated |
| IATA (Air) | Not regulated |
| Marine Pollutant | No |
| Transport Temperature | Ambient; protect from heat and moisture |
SECTION 16: REGULATORY STATUS
| Region / Authority | Status |
|---|---|
| European Union | REACH registered; industrial rubber chemical |
| USA (TSCA) | Listed |
| FDA (Rubber Articles) | Suitable for food contact rubber articles (with limitations) |
| Turkey | Industrial chemical; subject to chemical registration regulations |
| BfR (Germany) | Suitable for food contact rubber articles (with limitations) |
SECTION 17: OTHER NAMES AND SYNONYMS
| Type | Name |
|---|---|
| Common Names | Dibenzothiazyl Disulfide, MBTS, MBTS-75, Benzothiazole Disulfide |
| Chemical Names | 2,2'-Dithiobis(benzothiazole), Di(benzothiazol-2-yl) Disulfide, Benzothiazyl Disulfide |
| Trade Names | Altax, Vulkacit DM, Perkacit MBTS, Naugex MBTS, Accel M |
| Turkish Names | Dibenzotiyazol Disülfid, Benzotiyazol Disülfid |
| CAS Number | 120-78-5 |
| EC Number | 204-424-9 |
SECTION 18: MBTS APPLICATION SUMMARY TABLE
| Application | Function | Typical Phr | Key Benefit |
|---|---|---|---|
| Tires | Primary or secondary accelerator | 1.0-2.5 | Heat and reversion resistance |
| Hoses | Primary accelerator | 1.0-2.5 | Excellent aging resistance |
| Belts | Primary accelerator | 1.0-2.5 | Good mechanical properties |
| Footwear | Primary accelerator | 1.0-2.0 | Good processing safety |
| Industrial Goods | Primary accelerator or activator | 1.0-3.0 | Versatile, cost-effective |
| CR Cure Systems | Retarder | 0.5-1.5 | Scorch control in CR |
| Peroxide Cures | Retarder | 0.5-1.0 | Controlled crosslinking |
SECTION 19: SUMMARY TABLE
| Parameter | Value |
|---|---|
| Product | Dibenzothiazyl Disulfide (MBTS) |
| CAS Number | 120-78-5 |
| Molecular Formula | C₁₄H₈N₂S₄ |
| Molecular Weight | 332.49 g/mol |
| Appearance | Beige to yellow granules or powder |
| Melting Point | 170 – 180°C |
| Primary Function | Medium-fast primary rubber vulcanization accelerator |
| Masterbatch Form | MBTS-75 (75% active) |
| Shelf Life | 24 months |
| GHS Signal Word | Warning |
SECTION 20: CRITICAL WARNINGS AND BEST PRACTICES
CRITICAL WARNINGS:
-
Skin Sensitization: May cause allergic skin reaction (H317). Use protective gloves and avoid prolonged skin contact.
-
Dust Control: Fine powder may cause respiratory and eye irritation; use appropriate ventilation and PPE.
-
N-Nitrosamine: While MBTS itself does not contain nitrosamines, combination with certain secondary accelerators may produce nitrosamines; evaluate formulation carefully.
-
Environmental Hazard: Harmful to aquatic organisms; prevent release to the environment.
-
Storage Conditions: Store in cool, dry environment; avoid exposure to strong oxidizing agents and acids.
BEST PRACTICE RECOMMENDATIONS:
-
Primary Accelerator: Use at 1.0-3.0 phr as primary accelerator in NR, SBR, NBR, and general-purpose rubber compounds.
-
Activator with Sulfenamides: Use at 0.5-1.5 phr as activator with sulfenamide accelerators (CBS, TBBS) for optimized cure rate and scorch safety.
-
Masterbatch Form: Prefer MBTS-75 pre-dispersed form for excellent dispersion and reduced dust exposure.
-
CR Retarder: Use at 0.5-1.5 phr as retarder in sulfur-free or low-sulfur polychloroprene cure systems.
-
Peroxide Cure Modifier: Use at 0.5-1.0 phr as retarder in peroxide cure systems for controlled crosslinking.
LEGAL DISCLAIMER:
The information provided in this document is presented in good faith based on our current knowledge and experience; however, since all usage conditions are beyond our control, it does not constitute a binding specification or warranty. This Technical Data Sheet is for informational purposes only. Users are obligated to test the suitability for their own applications. For complete safety, storage, handling, transportation, disposal, and regulatory compliance information, refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier.
