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1. Typical Materials Composition of a
Tire
2. Typical Composition by Weight
3. Densities of Shredded and Whole Tires
4. Rubber weight by tire component.
5. Steel Tire Cord Analysis
1.
Typical Materials Composition
of a Tire
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This table lists the typical
types of materials used to manufacture tires.
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Typical Composition of
a Tire
Synthetic Rubber
Natural Rubber
Sulfur and sulfur compounds
Silica
Phenolic resin
Oil: aromatic, naphthenic, paraffinic
Fabric: Polyester, Nylon, Etc.
Petroleum waxes
Pigments: zinc oxide, titanium dioxide, etc.
Carbon black
Fatty acids
Inert materials
Steel Wire
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2.
Typical Composition by Weight
This lists the major classes of
materials used to manufacture tires by the percentage of the total
weight of the finished tire that each material class represents.
Passenger Tire
| Natural rubber |
14 % |
| Synthetic rubber |
27% |
| Carbon black |
28% |
| Steel |
14 - 15% |
| Fabric, fillers,
accelerators, antiozonants, etc. |
16 - 17% |
| Average
weight: |
New
25 lbs, Scrap 22.5 lbs. |
|
Truck Tire
| Natural rubber |
27 % |
| Synthetic rubber |
14% |
| Carbon black |
28% |
| Steel |
14 - 15% |
| Fabric, fillers,
accelerators, antiozonants, etc. |
16 - 17% |
| Average weight: |
New 120 lbs.,
Scrap 110 lbs. |
3.
Densities of Shredded and Whole Tires
| APPROXIMATE
DENSITIES |
| LOOSELY
PACKED |
|
DENSELY
PACKED |
| 550-600 lbs/yd3 |
single
pass |
1220-1,300
lbs/yd3 |
| 850-950 lbs/yd3 |
2"
shred |
1,350-1,450
lbs/yd3 |
| 1,000-1,100 lbs/yd3 |
1 1/2"
shred |
1,500-1,600
lbs/yd3 |
| 100/10Yd3 |
WHOLE
TIRES
(PASSENGER/LIGHT TRUCK) |
500/10Yd3 |
| |
| |
| 10
MESH- 29 lbs/ft3 |
| 20
MESH- 28 lbs/ft3 |
| 30
MESH- 28 lbs/ft3 |
| 40
MESH- 27 lbs/ft3 |
| 80
MESH- 25-26 lbs/ft3 |
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4.
Rubber weight by tire component.
A tire is manufactured from several
separate components, such as tread, innerliner, beads, belts,
etc. This table shows which components account for the rubber
used to make the tire.
| RUBBER
PERCENT BY WEIGHT IN A NEW RADIAL PASSENGER TIRE |
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| TREAD |
32.6% |
| BASE |
1.7% |
| SIDEWALL |
21.9% |
| BEAD APEX |
5.0% |
| BEAD INSULATION |
1.2% |
| FABRIC INSULATION |
11.8% |
| INSULATION OF STEEL CORD |
9.5% |
| INNERLINER |
12.4% |
| UNDERCUSHION |
3.9% |
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100.0% |
5.
Steel Tire Cord Analysis
The tire industry uses ASTM 1070
and above tire cord quality wire rod in the manufacture of new
tires. There are approximately 2.5 pounds of steel belts and bead
wire in a passenger car tire.
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