S-80 (SULFUR MASTERBATCH)

CAS Number: 7704-34-9
EC Number (EINECS): 231-722-6
Molecular Formula: S₈ (elemental sulfur)
Molecular Weight: 256.52 g/mol (S₈)
Chemical Class: Elemental sulfur (vulcanizing agent)

SECTION 1: PRODUCT IDENTIFICATION AND CHEMICAL IDENTITY

Parameter	Description
Chemical Name (IUPAC)	Sulfur (elemental)
Other Names	S-80, Sulfur Masterbatch, Vulcanization Agent, Masterbatch Sulfur, Rubber Vulcanizing Agent, S80
CAS Number	7704-34-9
EC Number (EINECS)	231-722-6
Molecular Formula	S₈ (elemental sulfur)
Molecular Weight	256.52 g/mol (S₈)
Chemical Class	Elemental sulfur (vulcanizing agent)
Appearance	Yellow granules
Odor	Mild characteristic

SECTION 2: COMPOSITION AND PHYSICAL PROPERTIES

2.1. Composition

Component	Content
Ultra-Fine Sulfur Powder	80% ± 1%
EPDM + Oil + Dispersant	20% ± 1%

2.2. Physical Properties

Property	Value / Range
Sulfur Content	≥ 99.5%
Appearance	Yellow granules
Density	1.50 ± 0.10 g/cm³
Mooney Viscosity (ML 1+4 @ 100°C)	< 80
Filtration	120 mesh / 200 μm
Moisture	≤ 2.0%
Ash	≤ 0.50%
Acidity (as H₂SO₄)	≤ 0.005%
Organic Matter	≤ 0.30%
Residue (150 μm)	≤ 0.10%

SECTION 3: CHEMICAL PROPERTIES AND REACTIONS

Property	Description
Chemical Class	Elemental sulfur
Functional Group	S-S bonds (disulfide)
Reactivity	High; forms crosslinks during vulcanization
Thermal Decomposition	> 200°C releases sulfur oxides (SOₓ)
Flammability	Combustible dust
Oxidation	Slow oxidation in air

3.1. Rubber Vulcanization Mechanism

Sulfur is the primary curing agent for natural and synthetic rubber vulcanization:

Crosslink Formation: Sulfur forms mono-, di-, and polysulfidic crosslinks between rubber chains
Vulcanization System: Used with accelerators and activators (zinc oxide, stearic acid)
Heat Resistance: Polysulfidic crosslinks provide heat resistance
Flexibility: Crosslink density determines hardness and elasticity properties

SECTION 4: FUNCTIONAL PROPERTIES

Property	Description
Product Type	Vulcanizing agent (masterbatch form)
Primary Use	Natural and synthetic rubber vulcanization
Function	Crosslink former
Dispersion	Excellent (pre-dispersed masterbatch)
Dusting	Low (granule form)
Odor	Mild
Compatibility	All natural and synthetic rubbers
Synergistic Effect	Works synergistically with accelerators and activators

SECTION 5: MAJOR APPLICATIONS AND END-USES

5.1. Rubber Vulcanization (Primary Application)

Application	Function	Suitability
Natural Rubber (NR)	Primary curing agent	High
Styrene-Butadiene Rubber (SBR)	Primary curing agent	High
Nitrile Rubber (NBR)	Primary curing agent	High
EPDM Rubber	Primary curing agent	High
Butyl Rubber (IIR)	Primary curing agent	High
Chloroprene Rubber (CR)	Primary curing agent	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

SECTION 6: INDUSTRY SUITABILITY MATRIX

Industry	Suitability	Explanation
Tire Manufacturing	High	Primary curing agent in all tire compounds
Automotive Rubber	High	Hoses, belts, seals, gaskets
Industrial Rubber	High	Conveyor belts, rollers, technical goods
Rubber Footwear	High	Rubber soles and components
Cable Industry	High	Insulation and sheathing compounds
General Rubber Goods	High	Various molded and extruded products

SECTION 7: DOSAGE AND APPLICATION

7.1. Recommended Dosage

Application	Dosage (phr - S-80)	Dosage (phr - Pure Sulfur)
Natural Rubber (NR)	2.0 - 3.5 phr	1.6 - 2.8 phr
SBR / NBR	1.5 - 2.5 phr	1.2 - 2.0 phr
EPDM	1.0 - 2.0 phr	0.8 - 1.6 phr
Butyl Rubber (IIR)	1.0 - 2.0 phr	0.8 - 1.6 phr
Low-Sulfur Systems	0.5 - 1.0 phr	0.4 - 0.8 phr
Sulfurless Systems	Not used	Not used

7.2. Advantages of Masterbatch Form (S-80)

Advantage	Description
Excellent Dispersion	Prevents localized over-sulfur areas
Consistent Performance	Ensures stable vulcanizate properties
Reduced Dust	Cleaner handling compared to powder sulfur
Easy Weighing	Granules facilitate accurate measurement
Worker Safety	Non-flying, non-leaking, low odor
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
Chemical Name	Elemental Sulfur
Commercial Names	S-80, Sulfur Masterbatch, Masterbatch Sulfur
Common Names	S-80, Vulcanization Agent, Rubber Sulfur
CAS Number	7704-34-9
EC Number	231-722-6
HS Code	28020000

SECTION 9: TOXICOLOGY AND HEALTH EFFECTS

Parameter	Value / Description
GHS Classification	Warning
Hazard Statements	H315 (Causes skin irritation), H319 (Causes serious eye irritation), H335 (May cause respiratory irritation)
Precautionary Statements	P261 (Avoid breathing dust), P280 (Wear protective gloves/eye protection), P302+P352 (IF ON SKIN: Wash with plenty of water), P305+P351+P338 (IF IN EYES: Rinse cautiously with water)
Oral LD50 (Rat)	> 5,000 mg/kg (low toxicity)
Skin Irritation	Mild irritant
Eye Irritation	Irritant
Skin Sensitization	Not sensitizing
Mutagenicity	Negative
Carcinogenicity	Not classified
Target Organs	Skin, eyes, respiratory system

SECTION 10: 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, moisture, high heat
Shelf Life	24 months (under recommended conditions)
Packaging	25 kg bags, 500 kg big bags

SECTION 11: TRANSPORT INFORMATION

Parameter	Information
UN Number	1350
Hazard Class	4.1 (Flammable Solid)
Packing Group	III
Proper Shipping Name	Sulfur
ADR/RID	UN 1350, Class 4.1, PG III
IMDG Code	UN 1350, Class 4.1, PG III
IATA (Air)	UN 1350, Class 4.1, PG III
Marine Pollutant	No

SECTION 12: FIRE-FIGHTING MEASURES

Parameter	Information
Fire Hazard	Combustible solid
Extinguishing Media	Water fog, CO₂, dry chemical, foam
Special Hazards	When heated, releases sulfur oxides (SOₓ)
Decomposition Products	Sulfur oxides (SO₂, SO₃)
Protective Equipment	Self-contained breathing apparatus (SCBA), full protective clothing

SECTION 13: ACCIDENTAL RELEASE AND CLEANUP

Parameter	Information
Personal Protection	Gloves, safety goggles, dust mask
Ventilation	Increase ventilation
Cleanup Methods	Sweep while preventing dust formation; collect in sealed containers
Environmental Precautions	Prevent entry into drains
Waste Disposal	According to local regulations

SECTION 14: 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 15: REGULATORY INFORMATION

Region / Authority	Status
EU REACH	Registered
Turkey KKDİK	Registration required
USA TSCA	Listed
EINECS	231-722-6
WGK (Germany)	1 (slight hazard to water)

SECTION 16: SUMMARY AND CRITICAL WARNINGS

Product Summary

Parameter	Value
Product	S-80 (Sulfur Masterbatch)
CAS	7704-34-9
Appearance	Yellow granules
Active Content	80% Sulfur
Density	1.50 ± 0.10 g/cm³
Primary Use	Vulcanizing agent
Key Industries	Tire, automotive rubber, industrial rubber

CRITICAL WARNINGS

Primary Vulcanizing Agent: S-80 is the primary curing agent for all natural and synthetic rubbers. Sulfur forms crosslinks between rubber chains, providing elastomeric properties.
Masterbatch Form Advantage: S-80 is a pre-dispersed granule form of ultra-fine sulfur powder with EPDM/oil/dispersant. Compared to powder sulfur, it provides safer, cleaner, and more homogeneous dispersion.
Worker Safety: Compared to powder sulfur, it is non-flying, non-leaking, and has low odor. This directly contributes to worker health and safety.
Excellent Dispersion: Provides excellent sulfur distribution in rubber, preventing localized over-sulfur areas (bloom).
Short Mixing Time: Particularly suitable for compounds requiring short mixing cycles.
Flammable: Classified as UN 1350, Class 4.1 (Flammable Solid). Keep away from fire and heat sources.
Storage: Store in cool, dry, well-ventilated areas. Keep away from strong oxidizers and moisture.
Dosage: Dosage should be adjusted according to accelerator system and rubber type. Excess sulfur may cause "bloom" (surface migration) and brittleness.
Synergistic System: Used with accelerators (CBS, TBBS, MBT, TMTD) and activators (zinc oxide, stearic acid).
Shelf Life: 24 months (under recommended conditions). Protect from moisture and heat during long-term storage.

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 S-80.

Sulfur, Rubber Vulcanizing Agent, Sulphur Masterbatch, S-80, S80, 7704-34-9