Dipentamethylene Thiuram Hexasulfide, Hexasulfide, DPTT, DPTT-75, DPTT75, 971-15-32
DPTT-75 (DIPENTAMETHYLENE THIURAM HEXASULFIDE)
CAS Number: 971-15-3
EC Number (EINECS): 213-539-3
Molecular Formula: C₁₁H₂₀N₂S₆
Molecular Weight: 348.68 g/mol
Chemical Class: Thiuram polysulfide (sulfur donor accelerator)
SECTION 1: PRODUCT IDENTIFICATION AND CHEMICAL IDENTITY
| Parameter |
Description |
| Chemical Name (IUPAC) |
Bis(piperidin-1-yl)methanethioylsulfanyl]sulfanylmethanethioyl]piperidine |
| Other Names |
DPTT, Dipentamethylene Thiuram Hexasulfide, Accelerator DPTT, SULFADS, DPTH, Hexasulfide, Thiuram hexasulfide |
| CAS Number |
971-15-3 |
| EC Number (EINECS) |
213-539-3 |
| Molecular Formula |
C₁₁H₂₀N₂S₆ |
| Molecular Weight |
348.68 g/mol |
| Chemical Class |
Thiuram polysulfide (sulfur donor accelerator) |
| Appearance (Powder Form) |
Light yellow to yellowish powder |
| Appearance (Granule Form) |
Beige to light yellow granules |
| Odor |
Mild characteristic |
SECTION 2: PRODUCT DESCRIPTION AND COMPOSITION
DPTT-75 is a pre-dispersed rubber accelerator containing 75% dipentamethylene thiuram hexasulfide (DPTT) 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 / sulfur donor |
| Active Content |
75% Dipentamethylene Thiuram Hexasulfide (DPTT) |
| Binder Content |
25% Elastomeric binder and dispersing agents |
| Physical Form |
Granules (beige to light yellow) |
| Density |
~1.23 g/cm³ |
| Function |
Primary or secondary accelerator / sulfur donor for natural and synthetic rubber vulcanization |
SECTION 3: PHYSICAL AND CHEMICAL PROPERTIES
3.1. Powder Form (Pure DPTT)
| Property |
Value / Range |
| Molecular Formula |
C₁₁H₂₀N₂S₆ |
| Molecular Weight |
348.68 g/mol |
| Appearance |
Light yellow to yellowish powder |
| Melting Point |
~110-115°C (decomposes) |
| Density (20°C) |
~1.30-1.40 g/cm³ |
| Solubility in Water |
Insoluble |
| Solubility in Organic Solvents |
Soluble in acetone, benzene, chloroform |
| pH (Aqueous) |
~6-7 (neutral) |
| Flash Point |
> 150°C |
| Decomposition |
> 150°C releases sulfur oxides, nitrogen oxides |
3.2. Granule Form (DPTT-75)
| Property |
Value / Range |
| Appearance |
Beige to light yellow granules |
| Density |
~1.23 g/cm³ |
| Active Content |
75% DPTT |
| Binder Content |
25% Elastomer binder |
| Form |
Pre-dispersed granules |
SECTION 4: FUNCTIONAL PROPERTIES
| Property |
Description |
| Accelerator Type |
Thiuram polysulfide (sulfur donor) |
| Function |
Primary or secondary accelerator / sulfur donor |
| Sulfur Donor |
Provides active sulfur for vulcanization (hexasulfide structure) |
| Curing Speed |
Moderate to fast |
| Scorch Safety |
Good processing safety |
| Heat Resistance |
Provides excellent heat and aging resistance |
| Weathering Resistance |
Excellent weather resistance |
| Crosslink Type |
Forms mono-, di-, and polysulfidic crosslinks |
| Synergistic Effect |
Works synergistically with sulfenamide and thiazole accelerators |
SECTION 5: COMPARISON - DPTT vs OTHER THIURAMS
| Property |
DPTT |
TMTD |
TETD |
DPTT-75 |
| Active Content |
Pure |
Pure |
Pure |
75% (pre-dispersed) |
| Sulfur Content |
~55% |
~27% |
~21% |
~41% (effective) |
| Sulfur Donor Capacity |
Very high |
Moderate |
Low |
High |
| Curing Speed |
Moderate-fast |
Fast |
Moderate |
Moderate-fast |
| Heat Resistance |
Excellent |
Good |
Good |
Excellent |
| Scorch Safety |
Good |
Low |
Moderate |
Good |
| Bloom |
Low |
High |
Moderate |
Low |
SECTION 6: MAJOR APPLICATIONS AND END-USES
6.1. Rubber Vulcanization (Primary Application)
| Application |
Function |
Suitability |
| Natural Rubber (NR) |
Primary accelerator / sulfur donor |
High |
| Styrene-Butadiene Rubber (SBR) |
Primary accelerator / sulfur donor |
High |
| Nitrile Rubber (NBR) |
Primary accelerator / sulfur donor |
High |
| EPDM Rubber |
Primary accelerator / sulfur donor |
High |
| Butyl Rubber (IIR) |
Primary accelerator / sulfur donor |
Moderate |
| Chloroprene Rubber (CR) |
Primary accelerator / sulfur donor |
Moderate |
| Other Synthetic Rubbers |
Primary accelerator / sulfur donor |
High |
6.2. 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 |
| Weather-Resistant Products |
High |
| Heat-Resistant Vulcanizates |
High |
SECTION 7: INDUSTRY SUITABILITY MATRIX
| Industry |
Suitability |
Explanation |
| Tire Manufacturing |
High |
Sulfur donor and accelerator for tire compounds |
| Automotive Rubber |
High |
Hoses, belts, seals, gaskets (heat/weather resistant) |
| Industrial Rubber |
High |
Conveyor belts, rollers, technical goods |
| Footwear |
High |
Rubber soles and components |
| General Rubber Goods |
High |
Various molded and extruded products |
| Weather-Resistant Products |
High |
Excellent weather resistance |
| Heat-Resistant Products |
High |
High-temperature applications |
| Latex Products |
Low |
Due to dispersion difficulties |
SECTION 8: DOSAGE AND APPLICATION
8.1. Recommended Dosage
| Application |
Dosage (phr) |
| General Use (DPTT-75) |
0.5 - 2.0 phr |
| Primary Accelerator |
0.5 - 1.5 phr (DPTT-75) |
| Secondary Accelerator |
0.3 - 0.8 phr (DPTT-75) + 0.5 - 1.5 phr (sulfenamide) |
| Sulfur Donor System |
1.0 - 2.0 phr (DPTT-75) |
| Low-Sulfur System |
0.5 - 1.5 phr (DPTT-75) + 0.3 - 0.5 phr (sulfur) |
8.2. Advantages of Pre-Dispersed Form (DPTT-75)
| 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 9: OTHER NAMES AND IDENTIFIERS
| Type |
Name / Description |
| IUPAC Name |
1,1'-[Hexasulfanediylbis(piperidine-1,1-diyl)]bis(ethan-1-one) |
| Chemical Name |
Dipentamethylene Thiuram Hexasulfide |
| Commercial Names |
Accelerator DPTT, SULFADS, DPTH, Rhenogran DPTT-75 |
| Common Names |
DPTT, Dipentamethylene Thiuram Hexasulfide |
| CAS Number |
971-15-3 |
| EC Number |
213-539-3 |
| HS Code |
29342000.00 |
SECTION 10: PRODUCTION METHOD
| Parameter |
Description |
| Method |
Piperidine + Carbon disulfide + Sulfur → Dipentamethylene Thiuram Hexasulfide |
| Reaction |
Condensation reaction with controlled sulfur addition |
| Purification |
Crystallization |
| Purity |
≥ 95% (typical commercial) |
| Formulation |
DPTT-75: 75% DPTT + 25% elastomer binder |
SECTION 11: 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) |
> 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 12: 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 |
12-24 months (under recommended conditions) |
| Packaging |
25 kg bags, 500 kg big bags |
SECTION 13: TRANSPORT INFORMATION
| Parameter |
Information |
| UN Number |
Not regulated (not classified as dangerous goods) |
| Hazard Class |
Not applicable |
| Packing Group |
Not applicable |
| Proper Shipping Name |
Dipentamethylene Thiuram Hexasulfide |
| ADR/RID |
Not regulated |
| IMDG Code |
Not regulated |
| IATA (Air) |
Not regulated |
| Marine Pollutant |
No |
SECTION 14: 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 15: 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 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 |
213-539-3 |
SECTION 17: SUMMARY AND CRITICAL WARNINGS
Product Summary
| Parameter |
Value |
| Product |
DPTT-75 (Dipentamethylene Thiuram Hexasulfide) |
| CAS |
971-15-3 |
| Appearance |
Beige to light yellow granules |
| Active Content |
75% DPTT |
| Density |
~1.23 g/cm³ |
| Primary Use |
Rubber accelerator / sulfur donor |
| Key Industries |
Tire, automotive rubber, industrial rubber, weather-resistant products |
CRITICAL WARNINGS
-
Sulfur Donor and Accelerator: DPTT functions as both a primary/secondary accelerator and a sulfur donor. The hexasulfide structure provides high sulfur content (~55%), making it an effective sulfur donor for vulcanization.
-
Excellent Weather Resistance: DPTT-cured rubber products exhibit excellent resistance to weather and aging, making them suitable for outdoor applications.
-
Versatile Application: Can be used as a primary accelerator, secondary accelerator, or sulfur donor depending on the curing system requirements.
-
Synergistic Effect: Shows excellent synergistic effects with sulfenamide and thiazole accelerators, providing enhanced curing characteristics and improved physical properties.
-
Crosslink Type: The hexasulfide structure provides a combination of mono-, di-, and polysulfidic crosslinks, contributing to good mechanical properties and heat resistance.
-
Pre-Dispersed Form Advantage: DPTT-75 pre-dispersed form provides excellent dispersion, preventing localized over-cured areas and ensuring consistent vulcanizate performance.
-
Skin Sensitization: DPTT may cause allergic skin reactions (H317). Appropriate PPE required during handling.
-
Storage: Store in cool, dry, well-ventilated areas. Keep away from strong oxidizers, acids, and bases.
-
Heat Resistance: Provides good heat and aging resistance, making it suitable for high-temperature applications.
-
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 DPTT-75.
