Insoluble Sulfur
Insoluble Sulfur Manufacturer & Supplier
Great Bridge Chemical supplies insoluble sulfur for tire manufacturing and industrial rubber compounding. Available grades include IS6005, IS6010, IS6033, IS7020, IS7520, IS8010, HS OT20, and HD OT20.
Insoluble sulfur is a polymeric form of sulfur used as a vulcanizing agent in rubber compounds. Compared with ordinary soluble sulfur, it has limited solubility in rubber before vulcanization and helps reduce sulfur migration and surface blooming during storage and processing.
This is particularly important in tire compounds and other rubber components where surface tack and adhesion between rubber layers or between rubber and reinforcing materials need to be maintained.
Product Types & Grades
|
Grade |
Total Sulfur Content (%) |
Insoluble Sulfur Content (% of Total Sulfur) |
Oil Content (%) |
Grade Characteristics |
|
IS6005 |
94–96 |
≥63 |
4–6 |
Oil-treated grade with lower oil content |
|
IS6010 |
89–91 |
≥67 |
9–11 |
Oil-treated grade |
|
IS6033 |
66–68* |
≥90 |
33±1 |
Higher oil-content grade |
|
IS7020 |
79–81 |
≥90 |
19–21 |
Oil-treated grade |
|
IS7520 |
79–81 |
≥94 |
19–21 |
Higher stated insoluble sulfur content than IS7020 |
|
IS8010 |
89–91 |
≥90 |
9–11 |
Higher stated insoluble sulfur content than IS6010 |
|
HS OT20 |
79–81* |
≥90 |
20±1 |
High thermal stability grade |
|
HD OT20 |
78.5–81.5 |
≥90 |
20±1.5 |
Oil-treated high-dispersion grade |
Technical Specifications
|
IS6005 – Detailed Technical Data |
|
|
Parameter |
Specification |
|
Appearance |
Yellow oil-filled powder |
|
Total sulfur content (%) |
94.0–96.0 |
|
Insoluble sulfur content (% of total sulfur) |
≥63.0 |
|
Oil content (%) |
4.0–6.0 |
|
Heat loss at 80±2°C (%) |
≤0.50 |
|
Ash at 600±25°C (%) |
≤0.15 |
|
Residue on 150 μm sieve (%) |
≤0.50 |
|
Acidity as H₂SO₄ (%) |
≤0.05 |
IS6033 – Published Technical Data
|
Parameter |
Specification |
|
|
Appearance |
Yellow powder (confirm physical form) |
|
|
Total sulfur content (%) |
66–68* |
|
|
Insoluble sulfur content (% of total sulfur) |
≥90 |
|
|
Oil content (%) |
33.0±1.0 |
|
|
Acidity as H₂SO₄ (%) |
≤0.05 |
|
|
Heating loss (%) |
≤0.40 |
|
|
Ash content (%) |
≤0.15 |
|
|
HS OT20 and HD OT20 – Thermal Stability Data |
||
|
Parameter |
HS OT20 |
HD OT20 |
|
Total sulfur content (%) |
79–81* |
78.5–81.5 |
|
Insoluble sulfur content (% of total sulfur) |
≥90 |
≥90 |
|
Oil content (%) |
20.0±1.0 |
20.0±1.5 |
|
Acidity as H₂SO₄ (%) |
≤0.05 |
≤0.05 |
|
Heating loss (%) |
≤0.40 |
≤0.50 |
|
Ash content (%) |
≤0.30 |
≤0.30 |
|
Thermal stability at 105°C for 15 min (%) |
≥75 |
≥75 |
|
Thermal stability at 120°C for 15 min (%) |
Not listed |
≥40 |
Confirm the current test method, reporting basis, and specification revision with the latest TDS. Do not use one grade's test limits as acceptance criteria for another grade.
Applications
Radial Tire Manufacturing
Used in carcass, belt skim, and sidewall compounds to maintain interlayer tack and prevent premature sulfur migration prior to mold curing.
Steel Cord Conveyor Belts
Provides uniform cross-linking across thick rubber sections and rubber-to-cord interfaces without surface crystallization.
Automotive Hoses & Mechanical Goods
Prevents tack loss and surface defects in stacked, unvulcanized extruded profiles awaiting secondary assembly.
Reduced Sulfur Migration and Blooming
Insoluble sulfur has limited solubility in rubber compounds before vulcanization. This helps reduce sulfur migration to the compound surface and can support surface tack and adhesion between rubber layers during tire building and other processing operations.
The actual effect depends on the insoluble sulfur content, grade stability, dosage, compound composition, and storage conditions. Product selection should be based on the required compound performance rather than on the grade name alone.
Thermal Stability During Processing
Insoluble sulfur is a metastable polymeric form of sulfur. Under unsuitable temperature and storage conditions, it can revert toward soluble sulfur, affecting its processing behavior.
For compounds involving elevated mixing temperatures, buyers should review the grade's thermal stability data and evaluate the actual mixing cycle. HS OT20 and HD OT20 have published thermal stability values at 105°C for 15 minutes. HD OT20 also has a published value at 120°C for 15 minutes.
Product Quality and Manufacturing Support
Great Bridge Chemical's production system includes reactors, dryers, pulverizers, granulators, mixing systems, automated process controls, and quality testing instruments. The company holds ISO 9001:2015 certification.
For insoluble sulfur orders, buyers can request product-specific TDS, SDS, and batch COA for technical review. The technical team also provides product selection support and sample services based on the intended rubber application.
Packaging & Supply
Published packaging
25 kg bags are listed on several individual grade pages. Confirm the available packaging for the selected grade before ordering.
Bag type
Kraft paper bag with an inner plastic liner is specified on selected grade pages.
Customized packaging
Available options should be confirmed according to grade and order quantity.
Shelf life
Check the manufacturing date and grade-specific validity period on the current product documents. The IS6005 product page lists a validity period of 12 months.
Storage
Keep the product sealed in a cool, dry, and well-ventilated place. Protect it from heat, sparks, open flames, and incompatible materials. Follow the storage and handling instructions in the current SDS.
Supply support
Grade selection assistance, sample services, export order coordination, and packaging inquiries.
FAQ
Request a Quote
Looking for an insoluble sulfur grade for tire production or industrial rubber compounding?
Send Great Bridge Chemical your product and application requirements. Our team can help identify a suitable grade and provide the relevant technical documents for evaluation.
To help us prepare an accurate quotation, please include:
Required grade: IS6005, IS6010, IS6033, IS7020, IS7520, IS8010, HS OT20, or HD OT20
Required insoluble sulfur content and oil content
Rubber application and compound type
Key technical specifications or target TDS
Order quantity and packaging requirements
Destination country and port
Sample or documentation requirements
Contact Great Bridge Chemical
Email: export@greatbridge-chem.com
Tel: +86-530-5399496
WhatsApp: 86 158 0675 1555
With abundant experience, we are one of the most professional insoluble sulfur manufacturers and suppliers in China. We warmly welcome you to buy high quality insoluble sulfur in stock here and get pricelist from our factory. Good service and reasonable price are available.
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