N-Cyclohexyl-2-benzothiazyl Sulfenamide, CBS, CZ, CBS-80, CBS80, 95-33-0
CBS-80 (N-CYCLOHEXYL-2-BENZOTHIAZYL SULFENAMIDE)
CAS Number: 95-33-0
EC Number (EINECS): 202-411-2
Molecular Formula: C₁₃H₁₆N₂S₂
Molecular Weight: 264.41 g/mol
Chemical Class: Sulfenamide accelerator
SECTION 1: PRODUCT IDENTIFICATION AND CHEMICAL IDENTITY
| Parameter |
Description |
| Chemical Name (IUPAC) |
N-Cyclohexyl-2-benzothiazyl sulfenamide |
| Other Names |
CBS, CZ, Santocure CBS, Vulkacit CZ, Accelerator CBS, N-Cyclohexylbenzothiazole-2-sulfenamide |
| CAS Number |
95-33-0 |
| EC Number (EINECS) |
202-411-2 |
| Molecular Formula |
C₁₃H₁₆N₂S₂ |
| Molecular Weight |
264.41 g/mol |
| Chemical Class |
Sulfenamide accelerator |
| Appearance (Powder Form) |
White to light gray powder |
| Appearance (Granule Form) |
Blue granules (color intensity may vary depending on raw materials) |
| Odor |
Slight characteristic |
SECTION 2: PHYSICAL AND CHEMICAL PROPERTIES
2.1. Powder Form (Pure CBS)
| Property |
Value / Range |
| Molecular Formula |
C₁₃H₁₆N₂S₂ |
| Molecular Weight |
264.41 g/mol |
| Appearance |
White to light gray powder |
| Melting Point |
95-100°C |
| Density |
~1.27-1.31 g/cm³ |
| Solubility in Water |
Insoluble |
| Solubility in Organic Solvents |
Soluble in acetone, chloroform, benzene, carbon tetrachloride; sparingly soluble in ethanol |
| pH (Aqueous) |
~6-7 (neutral) |
| Flash Point |
> 150°C |
| Decomposition |
> 200°C releases sulfur oxides, nitrogen oxides |
2.2. Granule Form (CBS-80)
| Property |
Value / Range |
| Appearance |
Blue granules |
| Density |
~1.19 g/cm³ (at 20°C) |
| Active Content |
80% CBS |
| Binder Content |
20% Elastomer binder and dispersing agents |
| Form |
Pre-dispersed granules |
SECTION 3: CHEMICAL PROPERTIES AND REACTIONS
| Property |
Description |
| Chemical Class |
Sulfenamide accelerator |
| Functional Group |
Sulfenamide (-S-N-) |
| Reactivity |
High; decomposes to MBT and cyclohexylamine during vulcanization |
| Thermal Decomposition |
> 200°C releases sulfur oxides (SOₓ) and nitrogen oxides (NOₓ) |
| Hydrolysis |
Hydrolyzes in acidic/basic conditions |
| Oxidation |
Can oxidize to corresponding disulfides |
3.1. Key Reactions
| Reaction Type |
Description |
| Thermal Decomposition |
Decomposes to MBT and cyclohexylamine during vulcanization |
| Accelerator Synergy |
Works synergistically with DPG, TMTD, and other accelerators |
| Thiuram Activation |
Activated by thiuram accelerators |
| Guanidine Synergy |
Works synergistically with DPG (diphenylguanidine) |
3.2. Rubber Curing Mechanism
CBS is a delayed-action accelerator for natural and synthetic rubber vulcanization:
-
Delayed-Action: Provides excellent scorch safety (long processing safety)
-
Fast Curing: Once initiated, provides fast curing
-
Activation: Decomposes to MBT (active accelerator) during vulcanization
-
Heat Resistance: Provides good heat and aging resistance
-
Sulfur System: Suitable for low-sulfur vulcanization systems
SECTION 4: FUNCTIONAL PROPERTIES
| Property |
Description |
| Accelerator Type |
Delayed-action (sulfenamide) |
| Primary Use |
Natural and synthetic rubber vulcanization |
| Function |
Accelerator / activator |
| Curing Speed |
Fast (after delay) |
| Scorch Safety |
Excellent (long processing safety) |
| Heat Resistance |
Provides good heat and aging resistance |
| Sulfur System |
Suitable for low-sulfur systems |
| Synergistic Effect |
Works synergistically with DPG, TMTD, and thiuram 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 |
Moderate |
| EPDM Rubber |
Primary accelerator |
Moderate |
| Chloroprene Rubber (CR) |
Primary accelerator |
Moderate |
5.2. Rubber Products
| Application |
Suitability |
| Tires |
High |
| Hoses |
High |
| Belts (Conveyor, Drive) |
High |
| Rubber Footwear |
High |
| General Industrial Products |
High |
| Technical Rubber Goods |
High |
| Low-Sulfur Curing Systems |
High |
SECTION 6: INDUSTRY SUITABILITY MATRIX
| Industry |
Suitability |
Explanation |
| Tire Manufacturing |
High |
Delayed-action accelerator for tire compounds |
| Automotive Rubber |
High |
Hoses, belts, seals, gaskets |
| Industrial Rubber |
High |
General industrial products |
| Rubber Footwear |
High |
Rubber soles and components |
| Technical Rubber Goods |
High |
Various molded and extruded products |
| Latex Products |
Limited |
Due to dispersion difficulties |
SECTION 7: DOSAGE AND APPLICATION
7.1. Recommended Dosage
| Application |
Dosage (phr) |
| As Primary Accelerator |
0.5 - 1.5 phr |
| With DPG Synergistic System |
0.5 - 1.0 phr (CBS) + 0.2 - 0.5 phr (DPG) |
| With Thiuram Accelerator |
0.5 - 1.0 phr (CBS) + 0.1 - 0.3 phr (TMTD/TMTM) |
| Low-Sulfur Systems |
0.5 - 1.0 phr (with reduced sulfur) |
7.2. Advantages of Pre-Dispersed Form (CBS-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 |
N-Cyclohexyl-2-benzothiazyl sulfenamide |
| Chemical Name |
N-Cyclohexylbenzothiazole-2-sulfenamide |
| Commercial Names |
CBS, CZ, Santocure CBS, Vulkacit CZ, Accelerator CBS |
| Common Names |
CBS, Cyclohexylbenzothiazyl sulfenamide |
| CAS Number |
95-33-0 |
| EC Number |
202-411-2 |
| RTECS Number |
DL6300000 |
| HS Code |
29342000 |
SECTION 9: COMPARISON - CBS vs TBBS vs MBS
| Property |
CBS |
TBBS |
MBS |
| Full Name |
N-Cyclohexyl-2-benzothiazyl sulfenamide |
N-tert-Butyl-2-benzothiazyl sulfenamide |
2-(Morpholinothio)benzothiazole |
| Scorch Safety |
Excellent |
Excellent |
Good |
| Curing Speed |
Fast |
Very fast |
Fast |
| Morpholine Release |
No |
No |
Yes |
| Heat Resistance |
Good |
Good |
Good |
| Nitrosamine Risk |
Low |
Low |
Low |
| Primary Use |
Tires, general rubber |
Tires (highly preferred) |
Industrial rubber |
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), H335 (May cause respiratory irritation) |
| 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) |
~3,500 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 |
| 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, moisture |
| 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 |
N-Cyclohexyl-2-benzothiazyl sulfenamide |
| 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: FIRST AID MEASURES
| Exposure Route |
Action |
| Inhalation |
Move to fresh air. Seek medical attention if symptoms persist. |
| Skin Contact |
Remove contaminated clothing. Wash with soap and plenty of water. |
| Eye Contact |
Rinse with plenty of water for at least 15 minutes. Seek medical attention if irritation persists. |
| Ingestion |
Do NOT induce vomiting. Drink plenty of water. Seek medical attention. |
SECTION 16: REGULATORY INFORMATION
| Region / Authority |
Status |
| EU REACH |
Registered |
| Turkey KKDİK |
Registration required |
| USA TSCA |
Listed |
| USA FDA |
Regulated for food contact (21 CFR) |
| EINECS |
202-411-2 |
| RTECS |
DL6300000 |
| WGK (Germany) |
1 (slight hazard to water) |
SECTION 17: SUMMARY AND CRITICAL WARNINGS
Product Summary
| Parameter |
Value |
| Product |
CBS-80 (N-Cyclohexyl-2-benzothiazyl sulfenamide) |
| CAS |
95-33-0 |
| Appearance |
Blue granules |
| Active Content |
80% CBS |
| Density |
~1.19 g/cm³ |
| Primary Use |
Delayed-action accelerator |
| Key Industries |
Tire, automotive rubber, industrial rubber |
CRITICAL WARNINGS
-
Delayed-Action Accelerator: CBS is a delayed-action accelerator providing excellent scorch safety (long processing safety) and fast curing once initiated.
-
Tire Industry Standard: CBS is one of the most widely used accelerators in the tire industry due to its excellent scorch safety and curing characteristics.
-
Active Species: During vulcanization, CBS decomposes to MBT (active accelerator) and cyclohexylamine.
-
Synergistic Systems: Works synergistically with DPG (diphenylguanidine) and thiuram accelerators (TMTD, TMTM) for enhanced curing.
-
Low Nitrosamine Risk: CBS has low nitrosamine formation potential, making it suitable for low-nitrosamine formulations.
-
Low-Sulfur Systems: Suitable for low-sulfur vulcanization systems when used with thiuram accelerators.
-
Skin Sensitization: CBS may cause allergic skin reactions (H317). Appropriate PPE required during handling.
-
Pre-Dispersed Form Advantage: CBS-80 form provides excellent dispersion, reduced dust, and easy weighing.
-
Storage: Store in cool, dry, well-ventilated areas. Keep away from strong oxidizers, acids, bases, and moisture.
-
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 CBS-80.
