What is Rubber Accelerator TBBS NS CAS 95-31-8?

Rubber Accelerator TBBS, also called Accelerator NS, CAS 95-31-8, is N-tert-butyl-2-benzothiazolesulfenamide with the molecular formula C11H14N2S2. It is a sulfenamide accelerator used in sulfur-cured rubber compounds to provide fast cure and high modulus while maintaining good processing safety.

How does TBBS NS compare with Accelerator CBS CZ?

TBBS gives a longer scorch delay than CBS/CZ, so it is safer in high-temperature mixing or long processing cycles. It is slightly more active on an equivalent dosage basis and is often used at a lower level than CBS to reach similar modulus in NR, SBR, BR and their blends.

Why is TBBS used as a replacement for NOBS?

NOBS can generate stable carcinogenic nitrosamines during rubber processing, while TBBS is regarded as a safer alternative that does not produce the same class of nitrosamines. This makes TBBS a common choice in modern tire and rubber goods formulations that need strong acceleration without the NOBS-related regulatory concern.

What are the main applications of Rubber Accelerator TBBS?

TBBS is used in tire compounds, including tread, sidewall and bead areas, as well as hoses, belts, rubber tapes, cable sheathing and other mechanical rubber goods. It is suitable for NR, SBR, BR and compatible blends, and can be used alone or with small amounts of ultra-accelerators.

What are typical specifications for TBBS NS industrial grade?

Commercial TBBS is usually off-white to cream granules or powder with initial melting point of at least 104-105 C, molecular weight about 238.37, and specific gravity around 1.26-1.32. It has very low water solubility and is soluble in many organic solvents; exact assay and residue limits vary by supplier.

Rubber Accelerator TBBS (NS) CAS 95-31-8

Rubber Accelerator TBBS (CAS 95-31-8), commercially known in the industry as Accelerator NS, is a premium delayed-action sulfenamide accelerator utilizing its specific steric hindrance to provide exceptional scorch safety during processing. Chemically identified as N-Tert-Butyl-2-Benzothiazole Sulfenamide, this cream-colored to light yellow powder (or granule) functions to delay the onset of vulcanization (scorch) while maintaining a fast high-cure rate once the activation temperature is reached. As a non-staining, non-discoloring accelerator, it is widely regarded as the superior, non-toxic alternative to NOBS (MBS). It is extensively integrated into the manufacturing of tires (treads and carcasses), conveyor belts, hoses, and industrial rubber products where high processing safety is required to prevent premature curing. We ensure bulk supply capabilities for this material, providing access to competitive factory pricing and customized specifications to meet specific physical forms (e.g., Powder, Oiled Powder, or Granules for low dust). Full technical documentation, including MSDS, TDS, COA, is available to support compliance and safety protocols. For another delayed-action sulfenamide accelerator, Rubber Accelerator CBS (CZ) is a related option to compare by cure rate, scorch safety and physical form.

CAS: 95-31-8
Synonyms: Accelerator NS, N-tert-butyl-2-benzothiazolesulfenamide, TBBS, N-t-butyl-2-benzothiazylsulfenamide, Benzothiazyl-2-tert-butylsulfenamide
Einecs: 202-409-1
Molecular Formula: C₁₁H₁₄N₂S₂
Grade: Industrial Grade
Package: 25 kg bag (standard); 500 kg / 1000 kg big bag optional (customizable)

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Product Description

TBBS is commonly used as a primary or secondary accelerator in carbon-black reinforced rubber compounds. It helps achieve high modulus and good mechanical performance while maintaining processing safety, which is why it is frequently selected for tire compounds and other demanding rubber goods.

1 Physicochemical Properties (Typical)

2 Applications

3 Storage Conditions

4 Safety Precautions

Physicochemical Properties (Typical)

Typical values for TBBS (granule/powder). Final specs follow COA by batch.

Item	Typical Value / Specification
Appearance	Off-white to cream granule or white/off-white solid
CAS	95-31-8
EC (EINECS)	202-409-1
Molecular formula	C₁₁H₁₄N₂S₂
Molecular weight	238.37 g/mol
Melting point (initial)	≥ 104°C (typical spec)
Specific gravity	1.26–1.32 (typical)
Water solubility	Practically insoluble / very low (mg/L level reported)
Solubility (organic)	Soluble in many organic solvents (e.g., acetone/ethanol/toluene etc.)
Vapor pressure	Very low (reported in EU-RAR datasets)

Applications

Tire compounds (tread/sidewall/bead areas depending on formulation)
Hoses, belts, rubber tapes, cable sheath and other mechanical rubber goods
NR / SBR / BR and compatible compound systems (lab trial recommended for final dosing)

For related sulfenamide and disulfide rubber accelerators, see Rubber Accelerator CBS and Rubber Accelerator MBTS.

Storage Conditions

Store in a cool, dry, well-ventilated place, in tightly sealed original packaging.
Keep away from heat sources, direct sunlight, moisture, and incompatible chemicals.
Avoid dust generation; keep containers closed when not in use.
Typical shelf life: 12 months (depends on packaging & warehouse conditions).

Safety Precautions

Avoid inhalation of dust; use local ventilation and respiratory protection if needed.
Wear chemical goggles/safety glasses and protective gloves to prevent eye/skin contact.
In case of eye contact, rinse with water for at least 15 minutes; seek medical advice if irritation persists.
Wash hands after handling; keep away from food and drinking areas.
SDS available upon request.

FAQ - Technical & Supply Chain

Q:
What is Rubber Accelerator TBBS NS CAS 95-31-8?

A: Rubber Accelerator TBBS, also called Accelerator NS, CAS 95-31-8, is N-tert-butyl-2-benzothiazolesulfenamide with the molecular formula C11H14N2S2. It is a sulfenamide accelerator used in sulfur-cured rubber compounds to provide fast cure and high modulus while maintaining good processing safety.
Q:
How does TBBS NS compare with Accelerator CBS CZ?

A: TBBS gives a longer scorch delay than CBS/CZ, so it is safer in high-temperature mixing or long processing cycles. It is slightly more active on an equivalent dosage basis and is often used at a lower level than CBS to reach similar modulus in NR, SBR, BR and their blends.
Q:
Why is TBBS used as a replacement for NOBS?

A: NOBS can generate stable carcinogenic nitrosamines during rubber processing, while TBBS is regarded as a safer alternative that does not produce the same class of nitrosamines. This makes TBBS a common choice in modern tire and rubber goods formulations that need strong acceleration without the NOBS-related regulatory concern.
Q:
What are the main applications of Rubber Accelerator TBBS?

A: TBBS is used in tire compounds, including tread, sidewall and bead areas, as well as hoses, belts, rubber tapes, cable sheathing and other mechanical rubber goods. It is suitable for NR, SBR, BR and compatible blends, and can be used alone or with small amounts of ultra-accelerators.
Q:
What are typical specifications for TBBS NS industrial grade?

A: Commercial TBBS is usually off-white to cream granules or powder with initial melting point of at least 104-105 C, molecular weight about 238.37, and specific gravity around 1.26-1.32. It has very low water solubility and is soluble in many organic solvents; exact assay and residue limits vary by supplier.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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