Mercaptobenzothiazole, 2-Mercaptobenzothiazole, Accelerator MBT, MBT-80, MBT80, 149-30-4
MBT-80 (2-MERCAPTOBENZOTHIAZOLE)
CAS Number: 149-30-4
EC Number (EINECS): 205-736-8
Molecular Formula: C₇H₅NS₂
Molecular Weight: 167.25 g/mol
Chemical Class: Benzothiazole accelerator
SECTION 1: PRODUCT IDENTIFICATION AND CHEMICAL IDENTITY
| Parameter |
Description |
| Chemical Name (IUPAC) |
1,3-Benzothiazole-2-thiol |
| Other Names |
MBT, 2-Mercaptobenzothiazole, Accelerator MBT, Mertax, Vulkacit, Mercaptobenzothiazole |
| CAS Number |
149-30-4 |
| EC Number (EINECS) |
205-736-8 |
| Molecular Formula |
C₇H₅NS₂ |
| Molecular Weight |
167.25 g/mol |
| Chemical Class |
Benzothiazole accelerator |
| Appearance (Powder Form) |
Light yellow to cream powder |
| Appearance (Granule Form) |
Light yellow to beige granules |
| Odor |
Slight characteristic |
SECTION 2: PRODUCT DESCRIPTION AND COMPOSITION
MBT-80 is a pre-dispersed rubber accelerator containing 80% 2-mercaptobenzothiazole (MBT) in an elastomeric binder and dispersing agents . It is designed to provide excellent dispersion of the accelerator in rubber compounds, avoiding localized over-cured areas and ensuring consistent performance in vulcanized products .
| Parameter |
Description |
| Product Type |
Pre-dispersed rubber accelerator |
| Active Content |
80% 2-Mercaptobenzothiazole (MBT) |
| Binder Content |
20% Elastomeric binder and dispersing agents |
| Physical Form |
Granules (light yellow to beige) |
| Density |
~1.45 g/cm³ |
| Function |
Primary accelerator for natural and synthetic rubber vulcanization |
SECTION 3: PHYSICAL AND CHEMICAL PROPERTIES
3.1. Powder Form (Pure MBT)
| Property |
Value / Range |
| Molecular Formula |
C₇H₅NS₂ |
| Molecular Weight |
167.25 g/mol |
| Appearance |
Light yellow to cream powder |
| Odor |
Slight characteristic |
| Melting Point |
~172-180°C |
| Density (20°C) |
~1.42-1.50 g/cm³ |
| Solubility in Water |
Insoluble |
| Solubility in Organic Solvents |
Soluble in acetone, ethanol, chloroform |
| pH (Aqueous) |
~5-6 (weakly acidic) |
| Flash Point |
> 200°C |
| Decomposition |
> 200°C releases sulfur oxides, nitrogen oxides |
3.2. Granule Form (MBT-80)
| Property |
Value / Range |
| Appearance |
Light yellow to beige granules |
| Density |
~1.45 g/cm³ |
| Active Content |
80% MBT |
| Binder Content |
20% Elastomer binder |
| Form |
Pre-dispersed granules |
SECTION 4: FUNCTIONAL PROPERTIES
| Property |
Description |
| Accelerator Type |
Primary accelerator for sulfur vulcanization |
| Curing Speed |
Relatively slow (provides good scorch safety) |
| Scorch Safety |
Good (longer processing safety) |
| Synergistic Effect |
Works synergistically with DPG, TMTD, and other accelerators |
| Crosslink Density |
Provides good crosslink density |
| Heat Resistance |
Provides good heat and aging resistance |
| Activation |
Functions as activator when used with delayed-action accelerators |
SECTION 5: MAJOR APPLICATIONS AND END-USES
5.1. Rubber Vulcanization (Primary Application)
| Application |
Function |
Suitability |
| Natural Rubber (NR) |
Primary accelerator |
High |
| Styrene-Butadiene Rubber (SBR) |
Primary accelerator |
High |
| Nitrile Rubber (NBR) |
Primary accelerator |
High |
| Butyl Rubber (IIR) |
Primary accelerator |
High |
| EPDM Rubber |
Primary accelerator |
High |
| Neoprene (CR) |
Primary accelerator |
High |
| Other Synthetic Rubbers |
Primary accelerator |
High |
5.2. Rubber Products
| Application |
Suitability |
| Tires |
High |
| Hoses |
High |
| Belts (Conveyor, Drive) |
High |
| Rubber Footwear |
High |
| General Industrial Products |
High |
| Seals and Gaskets |
High |
| Technical Rubber Goods |
High |
| Cable Insulation |
High |
| Roller Coverings |
High |
SECTION 6: INDUSTRY SUITABILITY MATRIX
| Industry |
Suitability |
Explanation |
| Tire Manufacturing |
High |
Primary accelerator in tire compounds |
| Automotive Rubber |
High |
Hoses, belts, seals, gaskets |
| Industrial Rubber |
High |
Conveyor belts, rollers, technical goods |
| Footwear |
High |
Rubber soles and components |
| Cable Industry |
High |
Insulation and sheathing compounds |
| General Rubber Goods |
High |
Various molded and extruded products |
| Latex Products |
Moderate |
Limited due to dispersion requirements |
| Medical Rubber |
Limited |
Subject to regulatory restrictions |
SECTION 7: DOSAGE AND APPLICATION
7.1. Recommended Dosage
| Application |
Dosage (phr) |
| Natural Rubber (NR) |
0.5 - 2.0 phr |
| Synthetic Rubber (SBR, NBR) |
0.5 - 2.0 phr |
| With DPG Synergistic System |
0.5 - 1.5 phr (MBT) + 0.2 - 0.5 phr (DPG) |
| With TMTD Synergistic System |
0.5 - 1.0 phr (MBT) + 0.1 - 0.3 phr (TMTD) |
7.2. Advantages of Pre-Dispersed Form (MBT-80)
| Advantage |
Description |
| Excellent Dispersion |
Prevents localized over-cured areas |
| Consistent Performance |
Ensures stable vulcanizate properties |
| Reduced Dust |
Cleaner handling compared to powder form |
| Easy Weighing |
Granules facilitate accurate measurement |
| Shorter Mixing Time |
Suitable for compounds requiring short mixing cycles |
| Better Homogeneity |
Uniform distribution in rubber matrix |
SECTION 8: OTHER NAMES AND IDENTIFIERS
| Type |
Name / Description |
| IUPAC Name |
1,3-Benzothiazole-2-thiol |
| Chemical Name |
2-Mercaptobenzothiazole |
| Commercial Names |
Accelerator MBT, Mertax, Vulkacit, Rhenogran MBT-80, Rhenoslab MBT-80 |
| Common Names |
MBT, Mercaptobenzothiazole |
| CAS Number |
149-30-4 |
| EC Number |
205-736-8 |
| HS Code |
29342000.00 |
SECTION 9: PRODUCTION METHOD
| Parameter |
Description |
| Method |
Aniline + Carbon disulfide + Sulfur → 2-Mercaptobenzothiazole |
| Reaction |
High-pressure synthesis (200-300°C, 50-100 bar) |
| Purification |
Crystallization and recrystallization |
| Purity |
≥ 98% (typical commercial) |
| Formulation |
MBT-80: 80% MBT + 20% elastomer binder |
SECTION 10: TOXICOLOGY AND HEALTH EFFECTS
| Parameter |
Value / Description |
| GHS Classification |
Warning |
| Hazard Statements |
H315 (Causes skin irritation), H319 (Causes serious eye irritation), H317 (May cause allergic skin reaction) |
| Precautionary Statements |
P261 (Avoid breathing dust), P280 (Wear protective gloves/protective clothing/eye protection/face protection), P302+P352 (IF ON SKIN: Wash with plenty of water), P305+P351+P338 (IF IN EYES: Rinse cautiously with water) |
| Oral LD50 (Rat) |
~1,000-2,000 mg/kg |
| Dermal LD50 (Rabbit) |
> 2,000 mg/kg |
| Skin Irritation |
Irritant; may cause contact dermatitis |
| Eye Irritation |
Irritant |
| Skin Sensitization |
Positive (allergic contact dermatitis) |
| Mutagenicity |
Negative (Ames test) |
| Carcinogenicity |
Not classified |
| Reproductive Toxicity |
Not classified |
| Target Organs |
Skin, eyes, respiratory system |
SECTION 11: SAFETY AND STORAGE
| Parameter |
Information |
| Storage Conditions |
Cool, dry, well-ventilated area |
| Temperature |
Room temperature (15-30°C) |
| Container |
Tightly closed, original packaging |
| Materials to Avoid |
Strong oxidizers, strong acids, strong bases |
| Shelf Life |
24 months (under recommended conditions) |
| Packaging |
25 kg bags, 500 kg big bags |
SECTION 12: TRANSPORT INFORMATION
| Parameter |
Information |
| UN Number |
Not regulated (not classified as dangerous goods) |
| Hazard Class |
Not applicable |
| Packing Group |
Not applicable |
| Proper Shipping Name |
2-Mercaptobenzothiazole |
| ADR/RID |
Not regulated |
| IMDG Code |
Not regulated |
| IATA (Air) |
Not regulated |
| Marine Pollutant |
No |
SECTION 13: FIRE-FIGHTING MEASURES
| Parameter |
Information |
| Fire Hazard |
Combustible dust |
| Extinguishing Media |
Water fog, CO₂, dry chemical, foam |
| Special Hazards |
When heated, releases sulfur oxides (SOₓ) and nitrogen oxides (NOₓ) |
| Decomposition Products |
Sulfur oxides, nitrogen oxides, CO, CO₂ |
| Protective Equipment |
Self-contained breathing apparatus (SCBA), full protective clothing |
SECTION 14: ACCIDENTAL RELEASE AND CLEANUP
| Parameter |
Information |
| Personal Protection |
Gloves, safety goggles, dust mask |
| Ventilation |
Increase ventilation |
| Cleanup Methods |
Sweep or vacuum while preventing dust formation; collect in sealed containers |
| Environmental Precautions |
Prevent entry into drains |
| Waste Disposal |
According to local regulations |
SECTION 15: REGULATORY INFORMATION
| Region / Authority |
Status |
| EU REACH |
Registered |
| Turkey KKDİK |
Registration required |
| USA TSCA |
Listed |
| USA FDA |
Regulated for food contact (21 CFR) |
| EINECS |
205-736-8 |
SECTION 16: SUMMARY AND CRITICAL WARNINGS
Product Summary
| Parameter |
Value |
| Product |
MBT-80 (2-Mercaptobenzothiazole) |
| CAS |
149-30-4 |
| Appearance |
Light yellow to beige granules |
| Active Content |
80% MBT |
| Density |
~1.45 g/cm³ |
| Primary Use |
Rubber vulcanization accelerator |
| Key Industries |
Tire, automotive rubber, industrial rubber, footwear |
CRITICAL WARNINGS
-
Primary Accelerator: MBT is a primary accelerator for sulfur vulcanization of natural and synthetic rubbers. It provides good scorch safety and relatively slow curing speed.
-
Synergistic Systems: MBT works synergistically with DPG (diphenylguanidine) and TMTD (tetramethylthiuram disulfide) accelerator systems.
-
Activator Function: MBT functions as an activator when used with delayed-action accelerators.
-
Heat and Aging Resistance: Provides good heat and aging resistance in rubber products.
-
Pre-Dispersed Advantage: MBT-80 pre-dispersed form provides excellent dispersion, preventing localized over-cured areas and ensuring consistent vulcanizate performance.
-
Skin Sensitization: MBT may cause allergic skin reactions (H317). Appropriate PPE required during handling.
-
Allergen Potential: MBT is a known contact allergen. Dermatitis risk for workers with repeated exposure.
-
Storage: Store in cool, dry, well-ventilated areas. Keep away from strong oxidizers, acids, and bases.
-
Dust Control: Avoid inhalation of dust. Use appropriate respiratory protection.
-
Regulatory Status: Registered under REACH. Food contact regulated under FDA 21 CFR.
IMPORTANT DISCLAIMER: This Technical Data Sheet (TDS) is for informational purposes only and is based on available technical data. The user is solely responsible for determining the product's suitability for their specific application and for complying with all applicable local, national, and international regulations. For complete safety, storage, handling, transportation, disposal, and regulatory compliance information, always refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier. Users are responsible for testing the product in their own processes and applications. All local, national, and international regulations must be followed when working with MBT-80.
