The Ultimate Scorch Defense: PVI Antiscorching Agent (CTP) Series
Empowering Rubber Processing with Powder & Granular Solutions
In the high-stakes environment of rubber vulcanization, “scorch” (premature vulcanization) is the single biggest threat to production efficiency and product quality.
PVI Antiscorching Agent (Chemical Name: N-(cyclohexylthio)phthalimide, commonly known as CTP) is the industry’s critical safeguard. By precisely delaying the onset of cure without affecting the final vulcanization rate, PVI provides the necessary “safety window” for mixing, calendering, and extrusion.
To meet the diverse needs of modern manufacturing—from traditional open mills to fully automated smart factories—we offer PVI (CTP) in two distinct forms: Classic Powder and Advanced Granules.
Dual Forms for Precise Application
We understand that one size does not fit all. Our dual-form strategy ensures you have the right additive for your specific equipment and environmental goals.
1. PVI Powder: The Classic, Cost-Effective Choice
Best for: SMEs, Open Mill Mixing, Conveyor Belts, General Rubber Goods.
Our PVI Powder is the market standard for established production lines. It offers mature performance and excellent cost-efficiency.
- Universal Compatibility: Perfectly compatible with Natural Rubber (NR), SBR, NBR, and other diene rubbers.
- Rapid Dispersion: Engineered with a controlled particle size distribution to ensure uniform mixing.
- Economic Efficiency: Requires a low dosage (0.1–0.4 phr) to significantly extend scorch time, neutralizing risks caused by temperature fluctuations in traditional mixing processes.
2. Granular PVI: The Eco-Friendly, Automation-Ready Upgrade
Best for: High-Performance Tires (EVs), Aviation Tires, Precision Seals, Smart Factories.
As environmental regulations tighten and Industry 4.0 takes hold, Granular PVI is the choice for top-tier manufacturers.
- Dust-Free & EHS Compliant: Advanced granulation technology eliminates airborne dust, helping factories control VOC concentrations (keeping them below 60mg/m³) and protecting worker health.
- Precision Dosing: The uniform white granules flow like water, enabling automated weighing systems to achieve accuracy within ±0.01 phr.
- Enhanced Stability: With a dispersion efficiency 30% higher than powder in internal mixers, granules prevent “white spots.” They also offer superior storage stability (12 months) by resisting caking and moisture absorption.
Technical Specifications
Our products are manufactured under strict quality control systems to meet global industry standards.
| Property | PVI Powder Specification | Granular PVI Specification |
| Appearance | White/Gray-white crystalline powder | White uniform granules (Dust-free) |
| Active Content | ≥ 96.00% | ≥ 97.00% |
| Initial Melting Point | ≥ 89.00°C | ≥ 89.00°C |
| Heating Loss | ≤ 0.50% | ≤ 0.50% |
| Ash Content | ≤ 0.10% | ≤ 0.10% |
| Toluene Insoluble | ≤ 0.50% | ≤ 0.50% |
| Bulk Density | 0.55–0.65 g/cm³ | 0.65–0.75 g/cm³ |
| Sieve Residue (100 mesh) | ≤ 0.20% | ≤ 0.10% |
Proven Performance: Real-World Case Studies
Our PVI series is currently driving efficiency in major tire plants and component factories worldwide.
Case 1: The EV Tire Revolution (Granular Application)
A leading New Energy Vehicle (EV) tire manufacturer switched from powder to our Granular PVI for their sidewall compounds.
- The Challenge: High rejection rates due to scorch and dust contamination.
- The Solution: Added 0.3 phr Granular PVI to the NR/BR blend.
- Results:
- Mooney Scorch Time ($t_{10}$ at 130°C) extended from 4.2 min to 7.8 min.
- Scorch fault rate dropped from 3.5% to 0.8%.
- Waste rubber loss reduced by 18%.
- Financial Impact: Annual savings in the millions due to improved automated feeding efficiency (+25%).
Case 2: Precision Export Seals (Powder Application)
A manufacturer of high-end NBR seals for the European market needed to improve dimensional accuracy.
- The Solution: Optimized formula using 0.2 phr PVI Powder.
- Results:
- Processing safety window extended by 40%, eliminating local scorching during extrusion.
- Dimensional tolerance pass rate increased from 92% to 98.5%.
- Market Impact: Zero negative impact on oil resistance or compression set, allowing successful entry into the premium EU market.
Case 3: Heavy-Duty Conveyor Belts (Cost Efficiency)
A mid-sized conveyor belt producer faced material waste due to short storage life of uncured rubber.
- The Solution: Introduced 0.4 phr PVI Powder at 170°C mixing temperature.
- Results:
- Production efficiency rose by 20%.
- Uncured compound storage life extended from 7 days to 30 days, drastically reducing material scrapping and improving production scheduling.
Industry Outlook: Why Upgrade Now?
The global market for Pre-vulcanization Inhibitors is expanding, driven by the rapid growth of the EV sector in the Asia-Pacific region.
The industry is bifurcating:
- Green & Smart: High-end manufacturers are mandating Granular PVI to meet strict environmental/dust regulations.
- Stable & Economical: Traditional sectors continue to rely on the cost-performance ratio of Powder PVI.
We cover both. Whether you are running a heritage production line or a state-of-the-art smart factory, our PVI series ensures you stay competitive.
Ready to Optimize Your Production?
Don’t let scorch ruin your batch. Partner with a supplier that offers advanced production technology, rigorous quality control, and expert technical support.
Contact us today to request a free sample or a formula optimization consultation.