Model formula for light truck tire innerliner
100 PHR Exxon™ bromobutyl 2222
Tire innerliners formulated with 100 PHR
Exxon™ bromobutyl maximize the air barrier
properties of the innerliner, protecting the rest of
the tire from degradation and ensuring top
performance.
Material Units Amount
Exxon bromobutyl 2222 PHR (1) 100.00
Carbon black N660 PHR 60.00
Naphthenic oil PHR 8.00
Aromatic and aliphatic hydrocarbon resin blend PHR 7.00
Phenolic tackifying resin PHR 4.00
Magnesium oxide PHR 0.15
Stearic acid PHR 2.00
Zinc oxide PHR 1.00
Sulfur PHR 0.50
Mercaptobenzothiazyl disulfide (MBTS) PHR 1.20
Total (PHR) 183.85
Properties Test method Units and Typical
based on conditions values (2)
Mooney viscosity ML (1+4) at 100°C ASTM D1646 MU, 100°C 56.0
Mooney scorch (tested at 125°C) ASTM D1646
Minimum viscosity ASTM D1646 MU 22.9
Time to 5pt rise ASTM D1646 minutes 34.0
Time to 10pt rise ASTM D1646 minutes 41.0
Time to 20pt rise ASTM D1646 minutes 49.0
MDR rheometer ASTM D5289 160°C; 30 minutes; 0.5 deg. arc
Ml (minimum torque) ASTM D5289 dNm 1.3
Mh (maximum torque) ASTM D5289 dNm 4.8
Mh- Ml (delta torque) ASTM D5289 dNm 3.5
Tc10 (time to 10% torque increase) ASTM D5289 minutes 2.2
Tc50 (time to 50% torque increase) ASTM D5289 minutes 5.8
Tc90 (time to 90% torque increase) ASTM D5289 minutes 12.8
Cure rate (peak rate) ASTM D5289 dNm/min 0.5
Model formula for light truck tire innerliner
100 PHR Exxon™ bromobutyl 2222
Properties Test method Units and Typical
based on conditions (2) values (3)
MDR rheometer ASTM D5289 180°C; 30 minutes; 0.5 deg. arc
Ml (minimum torque) ASTM D5289 dNm 1.1
Mh (maximum torque) ASTM D5289 dNm 4.3
Mh- Ml (delta torque) ASTM D5289 dNm 3.2
Tc10 (time to 10% torque increase) ASTM D5289 minutes 1.0
Tc50 (time to 50% torque increase) ASTM D5289 minutes 2.3
Tc90 (time to 90% torque increase) ASTM D5289 minutes 3.9
Cure rate (peak rate) ASTM D5289 dNm/min 1.4
Stress strain properties cure time3 25 minutes at 160°C
Tensile strength ASTM D412 MPa 9.6
Elongation at break % 837
Modulus 100% MPa 1.1
Modulus 200% MPa 2.1
Modulus 300% MPa 3.3
Energy to break joules 11.6
Tear strength (die B) peak load ASTM D624 KN/m 92.4
Tear strength (die B) mean KN/m 53.8
Hardness ASTM D2240 shore A 46.9
Rebound DIN 53512 %, 23 °C 10.0
Fatigue to failure (cycles) ASTM 4482 cycles at 136% strain 336159
Mocon oxygen permeability Coefficient ExxonMobil method cc*mm 0.78
(m2-day-mmHg)
at 60° C
ARES dynamic properties at 0 °C ExxonMobil method 1% strain, 10.0 Hz.
G' MPa 11.32
G" MPa 6.17
Tan_delta 0.55
ARES dynamic properties at 60 °C 1% strain, 10.0 Hz.
G' MPa 3.55
G" MPa 0.80
Tan_delta 0.23
1. Parts per hundred rubber.
2. Values given are typical and should not be interpreted as a specification.
3. Samples cured Tc 90 + 2 at 160°C.
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