Censil rubber grade precipitated silica — high dispersion silica filler for green tires, conveyor belts, rubber soles. Reinforcement & rolling resistance reduction. Alternative to Ultrasil & Zeosil. Free sample.
Censil 165MP is a micro-pearl Precipitated Silica designed as high-performance reinforcing filler for rubber and plastic applications. SiO2>=98%, BET 155-175 m2/g.
| Parameter | Specification |
|---|---|
| Model | Censil 165MP |
| Appearance | White micro-pearl |
| Heating Loss (105C) % | 4.0-8.0 |
| Ignition Loss (1000C) % | <=7.0 |
| DBP Absorption (cm3/g) | 2.00-2.80 |
| SiO2 Content % | >=98 |
| BET surface area (m2/g) | 155-175 |
| pH (5% Suspension) | 5.0-8.0 |
| Heavy Metals (Pb) mg/kg | <=30 |
| Na2SO4 % | <=1.5 |
| 100 Mesh Sieve Residue % | >=80 |
| Application | Reinforcing filler for rubber, tires, outsoles |
Request a free 200g sample: Request Sample
Censil is a professional rubber grade precipitated silica manufacturer in China, producing high-dispersion silica fillers for tire, industrial rubber, and shoe sole applications at Longyan Shenghe Chemical Co., Ltd. in Fujian. Censil serves tire manufacturers, rubber compounders, and footwear producers across 30+ countries with cost-effective alternatives to premium international brands.
Censil rubber grade precipitated silica serves as a high-performance reinforcement filler for rubber compounds, providing mechanical strength, improved wet grip, and reduced rolling resistance in tire treads. As a silica filler for rubber compounds, Censil silica replaces or partially replaces carbon black — enabling the green tire technology that reduces fuel consumption while maintaining traction on wet roads. With BET surface area up to 215 m²/g and SiO₂ ≥98.5%, Censil rubber grade silica delivers reinforcement comparable to Ultrasil 7000 and Zeosil 1165MP at 30-45% lower cost.
Green tire technology relies on precipitated silica for rubber compounds to achieve the critical balance between low rolling resistance and high wet grip. Censil rubber grade precipitated silica (Censil 180GR) provides the high surface area (BET 180-215 m²/g) and optimized morphology needed to work effectively with silane coupling agents — delivering tire performance that meets modern fuel efficiency and safety regulations.
| Tire Component | Recommended Grade | Silica Loading (phr) | Coupling Agent | Key Benefits |
|---|---|---|---|---|
| Passenger Car Tire Tread | Censil 180GR | 50-80 phr | TESPT (8-12% of silica) | 5-8% fuel savings, wet grip retention |
| Truck/Bus Radial Tire Tread | Censil 180GR | 40-65 phr | TESPT + co-agent | Rolling resistance reduction, tread wear |
| Tire Sidewall | Censil 165MP / 180GR | 15-30 phr | TESPT (optional) | Flex crack resistance, ozone resistance |
| Tire Inner Liner | Censil 165MP | 10-25 phr | — | Air retention, barrier properties |
| Motorcycle/Bicycle Tire Tread | Censil 180GR | 30-50 phr | TESPT | Wet grip, tread life, low cost |
| OTR Tire Tread | Censil 180GR | 35-60 phr | TESPT + CB blend | Cut/chip resistance, heat buildup control |
As a silica for tire applications, Censil 180GR is specifically formulated for high dispersion in rubber compounds. The granular form (20-mesh screen retention ≥65%, 60-mesh ≥75%) ensures low dust during weighing and mixing while maintaining excellent dispersibility in rubber matrices. When combined with silane coupling agents, Censil 180GR enables tire tread compounds that achieve rolling resistance reductions of 20-30% compared to carbon black-only formulations — a key requirement for EU tire labeling regulations and global fuel efficiency standards.
Beyond tires, Censil rubber grade precipitated silica serves as a versatile silica reinforcement filler for rubber compounds in industrial applications. From conveyor belts to automotive seals, Censil silica provides mechanical reinforcement, abrasion resistance, and improved product consistency — especially in applications where light-colored or non-black rubber compounds are required.
| Rubber Product | Recommended Grade | Silica Loading (phr) | Key Benefits |
|---|---|---|---|
| Conveyor Belts | Censil 165MP | 20-40 phr | Tensile strength, abrasion resistance, heat resistance |
| Automotive Hoses | Censil 165MP | 15-30 phr | Reinforcement, aging resistance, pressure stability |
| Rubber Seals & Gaskets | Censil 165MP | 10-25 phr | Compression set resistance, weathering, ozone |
| Vibration Isolators | Censil 165MP / 180GR | 15-35 phr | Dynamic stiffness control, fatigue resistance |
| Rubber Rollers (Printing) | Censil 165MP | 20-40 phr | Surface hardness, compression recovery, wear |
| Cable Jacketing | Censil 165MP | 15-30 phr | Dielectric properties, flame retardancy aid |
As a silica filler for rubber compounds, Censil 165MP micropearl provides consistent reinforcement across batch-to-batch production. The micropearl form (100-mesh screen retention ≥80%) ensures excellent flowability for automated rubber processing lines, while the controlled BET surface area (155-175 m²/g) provides balanced reinforcement without excessive compound stiffening.
Shoe sole manufacturers rely on precipitated silica for rubber to achieve the critical balance of abrasion resistance, flex crack resistance, and light-colored aesthetics. Censil rubber grade silica is the preferred silica filler for shoe sole rubber in athletic shoes, casual footwear, work boots, and safety shoes — delivering superior whitening performance compared to carbon black while maintaining mechanical durability.
| Shoe Type | Recommended Grade | Silica Loading (phr) | Key Benefits |
|---|---|---|---|
| Athletic / Running Shoe Soles | Censil 180GR | 40-70 phr | Abrasion resistance, grip, lightweight, white color |
| Casual / Fashion Shoe Soles | Censil 165MP | 30-50 phr | Whiteness, smooth surface, consistent color |
| Safety / Work Boot Soles | Censil 180GR | 50-80 phr | Oil resistance, heat resistance, durability |
| Children's Shoe Soles | Censil 165MP | 25-40 phr | Non-toxic filler, bright color options, flex crack |
| Sandal / Slipper Soles | Censil 165MP | 20-35 phr | Soft feel, good flex fatigue resistance |
| Industrial / Chemical Resistant Soles | Censil 180GR | 45-70 phr | Chemical resistance, high abrasion, oil proof |
For white shoe sole rubber applications, Censil silica is the industry-standard choice. Unlike carbon black which imparts dark color, CENSIL precipitated silica maintains bright whiteness (SiO₂ ≥98%) while providing comparable mechanical reinforcement. Shoe sole manufacturers typically use 40-70 phr of Censil silica with silane coupling agents to achieve DIN abrasion resistance indices above 100 — matching the wear resistance of carbon black-filled compounds while enabling multi-color sole designs.
Censil offers rubber grade precipitated silica in two optimized forms: micropearl (165MP) for general rubber reinforcement and granular (180GR) for high-performance tire and shoe sole applications.
| Property | Censil 165MP | Censil 180GR |
|---|---|---|
| Form | Micropearl | Granular |
| SiO₂ Content | ≥98% | ≥98.5% |
| BET Surface Area | 155-175 m²/g | 180-215 m²/g |
| DBP Absorption | 2.00-2.80 cm³/g | 200-280 ml/100g |
| Loss on Drying (105°C) | 4.0-8.0% | 4.0-8.0% |
| Loss on Ignition (1000°C) | ≤7.0% | ≤6.0% |
| pH (5% suspension) | 5.0-8.0 | 6.0-7.0 |
| Heavy Metals (Pb) | ≤30 mg/kg | ≤30 mg/kg |
| Na₂SO₄ Content | ≤1.5% | ≤2.5% |
| Screen Retention (100-mesh) | ≥80% | — |
| Screen Retention (20-mesh) | — | ≥65.0% |
| Screen Retention (60-mesh) | — | ≥75.0% |
| Best For | Industrial rubber, shoe soles, non-tire reinforcement | Green tire treads, high-performance shoe soles |
Tire manufacturers and rubber compounders evaluating rubber grade precipitated silica suppliers often compare Censil against leading international brands. Below is a specification-level comparison showing how Censil matches international performance while offering significant cost advantages.
| Property | Censil 180GR | Ultrasil® 7000GR | Zeosil® 1165MP | Tixosil® 365 |
|---|---|---|---|---|
| SiO₂ Content | ≥98.5% | ≥97% | ≥97% | ≥96% |
| BET Surface Area | 180-215 m²/g | 170-190 m²/g | 160-180 m²/g | 155-175 m²/g |
| DBP Absorption | 200-280 ml/100g | 220-260 ml/100g | 200-250 ml/100g | 180-220 ml/100g |
| Form | Granular | Granular | Micropearl | Powder |
| Dispersion in Rubber | High | High | High | Moderate |
| Low Dust Handling | ✅ Yes | ✅ Yes | ✅ Yes | ❌ Dusty |
| Silane Compatible | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes |
| Heavy Metals (Pb) | ≤30 mg/kg | ≤30 mg/kg | ≤30 mg/kg | ≤30 mg/kg |
| Cost Index | 100 | 160-190 | 150-180 | 140-160 |
| Lead Time | 2-3 weeks | 8-12 weeks | 6-8 weeks | 4-6 weeks |
Key Finding: Censil 180GR matches or exceeds international brands in BET surface area (180-215 vs 155-190 m²/g) and SiO₂ purity (≥98.5% vs ≥97%) while offering 30-45% cost savings. For tire manufacturers and rubber compounders seeking a cost-effective alternative to Ultrasil 7000 for green tire or a Zeosil 1165MP alternative, Censil delivers equivalent reinforcement performance at China-based pricing with shorter lead times.
| Property | Specification | Test Method |
|---|---|---|
| SiO₂ Content (dry basis) | ≥98-98.5% (grade dependent) | GB/T 31586 |
| Loss on Drying (105°C) | 4.0-8.0% | GB/T 31586 |
| Loss on Ignition (1000°C) | ≤6.0-7.0% (grade dependent) | GB/T 31586 |
| BET Surface Area | 155-215 m²/g (grade dependent) | GB/T 31586 |
| DBP Absorption | 2.00-2.80 cm³/g (165MP) / 200-280 ml/100g (180GR) | GB/T 31586 |
| Heavy Metals (Pb) | ≤30 mg/kg | REACH / GB |
| Sodium Sulfate (Na₂SO₄) | ≤1.5-2.5% (grade dependent) | GB/T 31586 |
| pH Value (5% suspension) | 5.0-8.0 | GB/T 31586 |
| CAS Number | 7631-86-9 | — |
Censil rubber grade precipitated silica is manufactured under strict quality management systems, ensuring consistent batch-to-batch performance for tire and rubber compound manufacturers worldwide:
Rubber grade precipitated silica is used as a reinforcement filler for rubber compounds across three major applications: (1) Green tires — replacing carbon black in tire treads to reduce rolling resistance and improve fuel efficiency; (2) Industrial rubber products — providing tensile strength in conveyor belts, hoses, seals, and vibration isolators; (3) Shoe soles — delivering abrasion resistance, whiteness, and flex crack resistance in athletic and casual footwear. Censil 180GR (BET 180-215 m²/g) is designed for high-performance tire applications, while Censil 165MP (BET 155-175 m²/g) covers general rubber reinforcement needs.
Yes. Censil 180GR rubber grade precipitated silica is designed as a direct alternative to Ultrasil 7000GR for green tire tread applications. Both are granular, high-dispersion silica with similar BET surface area ranges (180-215 vs 170-190 m²/g) and excellent dispersibility in rubber compounds. When combined with the same silane coupling agents (TESPT), Censil 180GR achieves comparable rolling resistance reduction and wet grip retention. Many Asian tire manufacturers have already adopted Censil 180GR as a cost-effective Ultrasil alternative, achieving 30-45% cost savings without reformulation.
Both serve different purposes. Carbon black provides superior tensile strength, abrasion resistance, and reinforcement — making it ideal for load-bearing applications and tread wear. Precipitated silica, when combined with silane coupling agents, enables green tire technology: it reduces rolling resistance by 20-30% compared to carbon black-only compounds, improves fuel efficiency by 5-8%, and maintains wet grip. Modern premium tires use a combination of both — silica in the tread for low rolling resistance, carbon black in the carcass for structural strength. The optimal formulation depends on the tire's target performance profile and regulatory requirements.
Silica improves rubber performance through three mechanisms: (1) Lower hysteresis — silica-filled compounds dissipate less energy as heat at tire operating temperatures, directly reducing rolling resistance and improving fuel efficiency; (2) Wet grip maintenance silica maintains traction on wet roads at low temperatures where carbon black loses grip; (3) Reinforcement — when bonded to rubber via silane coupling agents, silica achieves tensile strength comparable to carbon black. The combination of low rolling resistance and high wet grip is what makes silica the backbone of green tire technology and the driver behind modern tire labeling regulations.
Censil rubber grade silica works with standard silane coupling agents for rubber compounding. The most common is TESPT (bis(3-triethoxysilylpropyl)tetrasulfide), typically used at 8-12% of the silica loading. TESPT forms covalent bonds between the silica surface silanol groups and the rubber polymer chains, converting silica from a passive filler into an active reinforcement agent. For enhanced performance, some formulations combine TESPT with co-agents like diphenylguanidine (DPG) or polyethylene glycol (PEG) to improve coupling efficiency and reduce mixing time.
Censil 165MP is a micropearl form with BET 155-175 m²/g, designed for general rubber reinforcement in industrial rubber products, shoe soles, and non-tire applications. Its micropearl form (100-mesh retention ≥80%) provides excellent flowability for automated processing. Censil 180GR is a granular form with higher BET 180-215 m²/g and SiO₂ ≥98.5%, specifically engineered for high-performance tire treads and premium shoe soles. The granular form (20-mesh retention ≥65%) ensures low dust during weighing while maintaining high dispersion in rubber compounds.