When you look at a tyre gripping the road, a conveyor belt hauling heavy loads, or a tiny seal preventing fluid leaks, it’s easy to forget the science inside. The hidden heroes of these rubber products are chemical accelerators like CBS, MBT, and TMTD — each playing a unique role in ensuring your final product is strong, flexible, and long-lasting.
Choosing the right mix of these accelerators is not just lab work. It directly affects how your rubber:
✅ Cures under heat and pressure,
✅ Withstands repeated flexing,
✅ Fights cracking from ozone & sunlight,
✅ And stays durable over years of service.
Let’s explore how these three important chemicals shape the performance of your tyres, belts, and seals.
📌 What is CBS? (N-Cyclohexyl-2-benzothiazole sulfenamide)
CBS is one of the most widely used delayed-action primary accelerators. In simple words, it slows down the start of vulcanization (providing excellent scorch safety) but then kicks in strongly during the final curing phase.
- Why it’s used:
- Gives your compound more processing time, so you can extrude or mold without premature crosslinking.
- Produces a robust network of sulfur crosslinks that improves tensile strength, elasticity, and heat resistance.
- Typical applications:
- Passenger & truck tyres (tread and sidewall)
- Heavy-duty conveyor belts
- Rubber tracks & molded automotive parts
Without CBS, many high-speed mixing or molding lines would struggle with scorch (rubber setting up too early), causing waste and costly downtime.
🔬 What is MBT? (2-Mercaptobenzothiazole)
MBT is often called a semi-ultra accelerator. It kicks off the vulcanization process faster than CBS, but still under controlled rates.
- Why it’s used:
- Offers a good balance between cure speed and safety.
- Works as a secondary accelerator with CBS to fine-tune cure profiles.
- Helps improve modulus and compression set, which is critical for seals and gaskets.
- Common applications:
- Hoses, gaskets, small molded seals
- Conveyor belt covers needing balanced heat aging & flex properties
- Tyre inner plies or flaps
Many compounders pair MBT + CBS to get both processing safety and fast, efficient final curing.
⚙ What is TMTD? (Tetramethylthiuram disulfide)
TMTD is an ultra accelerator. It works rapidly and also acts as a sulfur donor, which means it can contribute to the crosslink network without extra sulfur.
- Why it’s used:
- Dramatically reduces cure times, useful for thick or complex molded parts.
- Helps achieve high crosslink density, boosting abrasion and tear resistance.
- Often used in low-sulfur or sulfur-less recipes (peroxide + TMTD systems).
- Typical uses:
- Wire and cable sheaths
- Conveyor belt carcasses
- Specialty industrial seals exposed to aggressive environments
🏭 How these accelerators combine to shape performance
Rubber technologists rarely rely on a single accelerator. Instead, they blend CBS, MBT, and TMTD (or other partners) to fine-tune properties like:
| Property Improved | CBS Role | MBT Role | TMTD Role |
|---|---|---|---|
| Processing safety (scorch) | Excellent | Moderate | Poor alone (fast onset) |
| Cure speed | Moderate (delayed) | Faster | Very fast (ultra) |
| Heat & flex cracking resistance | Strong crosslinks | Supports aging balance | High crosslink density |
| Compression set | Supports resilience | Improves retention | Excellent when combined |
By adjusting the ratios, your technical team ensures tyres remain elastic over thousands of cycles, conveyor belts resist cuts & tears, and seals maintain tight closures under pressure.
🚀 The hidden costs of poor accelerator selection
Many startups or smaller plants try to cut costs by compromising on accelerator quality or substituting formulations without proper testing. This often leads to:
- Premature hardening (poor scorch safety) → causes lumps during extrusion or molding.
- Under-vulcanized rubber → fails under load, cracks quickly.
- Inconsistent hardness across batches → leads to warranty returns.
That’s why it’s crucial to partner with a trusted manufacturer who not only supplies CBS, MBT, TMTD and other accelerators at consistent purities, but also helps you tailor recipes for your unique application.
👷 How we can help your rubber perform better
At Arihant Reclamation Pvt. Ltd., we’ve worked with countless tyre, belt, and molded goods manufacturers across India and worldwide.
- ✅ We supply high-purity CBS, MBT, MBTS, TMTD with tight quality controls.
- ✅ Provide batch COAs & full traceability, ensuring you get the same performance every time.
- ✅ Assist your lab & production teams in balancing accelerator systems for maximum life, fewer rejects, and lower total costs.
Whether you’re scaling up a conveyor belt line or launching a new seal molding plant, our technical and commercial teams are ready to support you.
👉 Ready to enhance your rubber compounds?
The choice of accelerators like CBS, MBT, and TMTD isn’t just chemistry — it’s the foundation of your product’s success. Let’s work together to engineer rubber compounds that keep your customers satisfied and your reputation strong.
| Product | Typical Use Cases |
|---|---|
| Accelerator MBT | General rubber goods, footwear soles, hoses |
| Accelerator MBTS | Tires, conveyor belts, thick molded products |
| Accelerator CBS | Fast curing for automotive rubber, mechanical goods |
| Accelerator TMTD | As ultra accelerator or sulfur donor in rubber blends |
| Accelerator ZDEC | Ultra-fast latex applications like gloves & balloons |
| Antioxidant IPPD | Protects rubber from oxygen & flex cracking |
| Antioxidant 6PPD | Outstanding ozone & weather resistance for outdoor rubber |
Contact us today to learn more about our export-grade rubber chemicals and how we can support your manufacturing needs.
Why ARPL is the Right Choice
- 🏆 Recognized Exporter & Supplier
- 🧪 ISO-certified production with strict quality control
- 🚚 Fast logistics network to all major cities in Gujarat
- 📈 Flexible MOQ & bulk order fulfillment
- 🤝 Long-term supplier to companies in SEZs and industrial parks across India
✅ Connect With Us Today!
📞 Phone: +91-8860732624
📧 Email: arihantreclamation@gmail.com
🌐 Website: www.arihantreclamationpvtltd.com