General Definition of Carbon Black

Over the years, many materials have been used as fillers in rubber compounds. In this sense, filler is a diluent and is used primarily to lower volume cost. With use, all fillers modify certain physical properties of the compound in addition to lowering cost. Therefore, lower cost is generally achieved at the expense of other desirable properties and all compounds are compromises with various trade-offs considered and balanced by the compounder. Elastomer systems respond to the addition of a few fillers, termed reinforcing agents, in a way that enhances certain properties. Among such substances used in rubber compounding, carbon black is unique in its ability to significantly enhance the properties of nearly any base elastomer system while lowering cost. It is truly more than a simple filler. 

Buried within the generic term carbon black are many variations on a theme. There are so many facets to carbon black, each altering a rubber compound in its own subtle way, that the number of possible products is almost limitless. Recognition of some of these facets has, in many instances, been easier than devising corresponding testing methods, which would allow process control and exploitation as new products. Indeed, product refinement in the carbon black industry is probably hampered more by lack of definitive testing methods than by any other single problem. Still, a vast amount of progress has been achieved by the industry to the point that carbon black is doubtless the most refined and best-controlled commodity available to the rubber industry.

In the simplest terms, carbon black is essentially elemental carbon in the form of extremely fine particles having an amorphous molecular structure. Buried within the amorphous mass is an infrastructure of microcrystalline arrays of condensed rings. These arrays appear to be similar to the layered condensed ring form exhibited by graphite, which is another form of carbon. The orientation of the arrays within the amorphous mass appears to be random, consequently a large percentage of arrays have open edges of their layer planes at the surface of the particle. Associated with these open edges are large numbers of unsatisfied carbon bonds providing sites for chemical activity. In use, particles remain largely intact and many of the useful properties of carbon black stem from their morphological characteristics while others result from surface activity. 

Carbon Black Uses
  1. Rubber reinforcement. Carbon black is a rubber-reinforcing additive used in a multitude of rubber products. In particular, in case of vehicles, large amounts of carbon black are used for tires. In addition, carbon black is used with rubber to dampen earthquake vibration, in the soles of shoes and in many other products.
  2.  Plastic pigmentation. Compared with other colorants, carbon black has a high coloring power. Therefore. it is used as ink for printing newspapers, as ink-jet toner, and other such uses. It is also suitable as a pigment for heat-molded plastics, car fenders, coating for electric wires and other products.
  3.  Conductors for the electric industry. Since carbon black has excellent conductive properties, it is used as a component for magnetic tapes and semiconductors.
Packing of Carbon Black
Carbon Black GradesPaper Sacks (Kg)Qty Paper Sacks On Each PalletPallet Qty (Paper Sacks) 20Ft Fcl- 40 Ft FclQty (Paper Sacks) Kg 20Ft Fcl- 40 Ft Fcl
Carbon Black GradesBig Bag (Kg)Big Bag Qty 20ft FCL – 40ft FCLQty (Big Bag) Kg 20ft FCL – 40ft FCL
Carbon Black Specification
NO.PropertyAbbrev.N – 375N – 550N – 660Unitref. test methodW. NO
1Iodine Adsorption NumberIAN86 – 9439 – 4732 – 40gr/KgASTM D-1510WQ – 0608
2DBP Absorption NumberDBP110 – 118117 -12586 – 94cm3/100grASTM D-2414WQ – 0605
3Nitrogen Surface AreaNSA88 – 9835 – 4530 – 40m2/grASTM D-6556WQ – 0606
4CTAB Surface AreaCTAB91 – 10535 -4928 – 42m2/grASTM D-3765WQ – 0604
5DBP Of Compressed SampleCDBP91 – 10180 – 9069 – 79cm3/100grASTM D-3493WQ – 0609
6Sieve Residue (max):Grit    ASTM D-1514WQ – 0616
 Sieve no. 325 ( 0.045 mm ) D1514WQ – 0616
 Sieve no. 35 ( 0.5 mm ) 0.0010.0010.001%ASTM D-1514WQ – 0616
7Ash Content(max)Ash0.750.750.75%ASTM D-1506WQ – 0601
8Fines Content(max) (BAG)Fines121212%ASTM D-1508WQ – 0617
9Fines Content(max)(BIG BAG)Fines777%ASTM D-1508WQ – 0617
10Individual Pellet StrengthIPHT10 – 4010 – 4010 – 40CNASTM D-5230 
11Heating Loss(max)H.Loss21.51.5%ASTM D-1509WQ – 0615
12Tint StrengthTint109 – 11958 – 6855 -65% ITRBASTM D-3265WQ – 0607
13Pour Density 320 – 370335 – 385415 – 465Kg/m3ASTM D-1513WQ – 0611
14Toluene Discoloration (min)Toluene807575%ASTM D-1618WQ – 0612
15Volatile Content(max)Volatile111% WQ – 0610
15PH(MIN)PH777 ASTM D-1512WQ – 0614
16Sulfur(MAX) D-1619WQ – 0603
NO.PropertyAbbrev.N – 220N – 330Unitref. test methodW. NO
1Iodine Adsorption NumberIAN117 – 12578 – 86gr/KgASTM D-1510WQ – 0608
2DBP Absorption NumberDBP110 – 11898 -106cm3/100grASTM D-2414WQ – 0605
3Nitrogen Surface AreaNSA114 – 12473 – 83m2/grASTM D-6556WQ – 0606
4CTAB Surface AreaCTAB104 – 11876 – 90m2/grASTM D-3765WQ – 0604
5DBP Of Compressed SampleCDBP93 – 10383 – 93cm3/100grASTM D-3493WQ – 0609
6Sieve Residue (max):Grit   ASTM D-1514WQ – 0616
 Sieve no. 325 ( 0.045 mm ) 0.10.1%ASTM D1514WQ – 0616
 Sieve no. 35 ( 0.5 mm ) 0.0010.001%ASTM D-1514WQ – 0616
7Ash Content(max)Ash0.750.75%ASTM D-1506WQ – 0601
8Fines Content(max) (BAG)Fines1212%ASTM D-1508WQ – 0617
 Fines Content(max)(BIG BAG)Fines77%ASTM D-1508WQ – 0617
9Individual Pellet StrengthIPHT10 – 4010 – 40CNASTM D-5230 
10Heating Loss(max)H.Loss22%ASTM D-1509WQ – 0615
11Tint StrengthTint111 – 12199 – 109% ITRBASTM D-3265WQ – 0607
12Pour Density 330 – 380355 – 405Kg/m3ASTM D-1513WQ – 0611
13Toluene Discoloration (min)Toluene8080%ASTM D-1618WQ – 0612
14Volatile Content(max)Volatile11% WQ – 0610
15Sulfur (MAX) 2.52.5%ASTM D-1619WQ – 0603