Carbon Blacks for Rubber. Extrusion. Dimensional Classification of Carbon Blacks for Class A and General Purpose Extrusion

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Matthew Fleming
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1 Carbon Blacks for Rubber Extrusion Dimensional Classification of Carbon Blacks for Class A and General Purpose Extrusion Corporate Headquarters 1800 West Oak Commons Road Marietta, GA USA 01/08

2 Columbian Extrusion Carbon Blacks ASTM Grades ASTM Carbon blacks offer a cost effective solution for many extrusion applications. Columbian produces a complete range of these products to extrusion Technology Grades (XT) In order to meet our customer requirements of a cost effective, high performance extrusion product, Columbian Chemicals has introduced the XT line of products. These offer many of the benefits of our Ultra line of products, but with morphology tailored to extrusion applications, giving benefits including reduced mixing times, improved surface appearance, increased screen life and higher loadings. ULTRA Rubber Carbon Blacks Standard quality carbon blacks have very low levels of ash and residue as impurities - typically below 0.3% and 0.004%, respectively. Columbian has pioneered the production of Ultra high quality carbon blacks, which significantly reduce ash to levels around 0.05% and residue to levels much less than 0.002%. The benefits of Ultra carbon blacks include superior surface appearance and improved flex fatigue life due to enhanced dispersion and the reduction of ash and residue impurities leading to best in class screen life. Ultra carbon blacks are best suited for high quality extruded profiles and for applications where life-extension of the rubber article is critical. DIMENSIONAL CLASSIFICATION OF EXTRUSION CARBONS Oil Adsorpsion Number (ml/g) XT1029 XT4 FX1 N-650 XT1021 N-550 N STSA (m²/g)

3 extrusion Technology Grades (XT) In order to meet our customer requirements of a cost effective, high performance extrusion product, Columbian Chemicals has introduced the XT line of products. These offer many of the benefits of our Ultra line of products, but with morphology tailored to extrusion applications, giving benefits including reduced mixing times, improved surface appearance, increased screen life and higher loadings. ULTRA Rubber Carbon Blacks Standard quality carbon blacks have very low levels of ash and residue as impurities - typically below 0.3% and 0.004%, respectively. Columbian has pioneered the production of Ultra high quality carbon blacks, which significantly reduce ash to levels around 0.05% and residue to levels much less than 0.002%. The benefits of Ultra carbon blacks include superior surface appearance and improved flex fatigue life due to enhanced dispersion and the reduction of ash and residue impurities leading to best in class screen life. Ultra carbon blacks are best suited for high quality extruded profiles and for applications where life-extension of the rubber article is critical. PROCESSING BENEFITS OF XT AND ULTRA CARBON BLACKS 120 Screen Life 102 Relative Pressure Build Up (psi/kg) Incorporation Time Relative Black Incorporation Time (s) 0 90 N550 XT4 XT1029 N550U

4 APPLICATION PROPERTY GUIDE To assist in the selection of the grades most suitable for your application, the following charts compare our XT and standard ASTM rubber carbon black grades. This data was generated using a model sulphur cured EPDM formulation with oil and carbon black loadings adjusted to maintain 60 Shore A and 10 MPa Tensile Strength. A more detailed set of data is also available through your local sales representative to assist you in meeting your customer s requirements and maximizing the benefit you receive when utilizing Columbian XT carbon black products. XT1021 XT1029 XT4 FX1 N539 N550 N650 Carbon Black Loading phr Oil Loading phr Viscosity MU Hardness Shore A % Modulus MPa Tensile Strength MPa Volume Resistivity Ohm.cm Jetness L Gloss GU Defect Count (Relative to N550) XT1029 XT4 FX1U N550U FX1 N550 N650

5 COLUMBIAN with corporate headquarters located in Atlanta Georgia (USA) is a worldwide producer of carbon blacks for the rubber industry. Advantages of XT and Ultra Columbian Grades Columbian has developed a range of carbon blacks to meet the industry need for improved appearance and performance of rubber profile extrusions. Columbian s XT range of carbon blacks offer a cost effective solution for high quality profiles, while our Ultra carbon black offers the ultimate in cleanliness for the most demanding applications. Compared to Columbian s standard ASTM range of extrusion grades, its XT grades give the following advantages over N550 (at equal hardness): XT No change in formulation required XT % higher loading + Lower gloss surface + Lower conductivity XT4 + 20% higher loading + Low gloss surface + Low conductivity Selection of an Ultra version of a standard grade gives the following advantages: Ultra Better surface appearance Fewer screen changes No change in formulation required Sales Offices Asia Europe North America South America 11 th FL., Oriental Chemical Building, Sogong- Dong, Jung-Gu, Seoul Korea Podbielskistraße 160 D Hannover Germany Technical Service 1800 West Oak Commons Court Marietta, Georgia USA Rua Dr. Cândido Espinheira, nº 560, 7º andar São Paulo SP Brasil vendas@columbianchemicals.com #1-3, Wolha-Dong, Yeosu-City, Jeonnam, Korea spark@columbianchemicals.com Podbielskistraße 160 D Hannover Germany technicalservice@columbianchemicals.com 1800 West Oak Commons Court Marietta, Georgia USA iteam@columbianchemicals.com Estrada Renê Fonseca s/n Cubatão São Paulo Brasil assistenciatecnica@columbianchemicals.com The facts and recommendations made in this publication are based on our own research or others, and are believed to be accurate. However, no guarantee of accuracy is made, the products discussed being sold without warranty, expressed or implied, including but not limited to any WARRANTY OF MERCHANTABILITY AND / OR FITNESS FOR A PARTICULAR PURPOSE OR USE. Statements concerning the possible use of our products are not intended as recommendations to use our products in the infringement of any patent.

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