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Fine Calcium Carbonates in Rubber

Polcarb™ 90 and Polcarb™ SB are used where very fine calcium carbonate is required in rubber compounding without resorting to the expensive precipitated calcium carbonates.

 

Such applications include high quality extrusions and domestic products. Calcium carbonates are useful where rubber items of lower hardness are required. Polcarb™ 90 and Polcarb™ SB impart higher reinforcement than conventional coarse grade calcium carbonates - the hot-tear strength is often significantly higher.

 

Polcarb™ 50SV, Polcarb™ 60 and Polcarb™ 60S are less fine than Polcarb™ 90 and Polcarb™ SB / Polcarb™ SV but still have a very low level of coarse particles present making them suitable for production of high quality extrusions and mouldings.

 

The three stearate-treated calcium carbonate products, Polcarb SB, Polcarb™ 60S and Polcarb™ 50SV, have some advantages; The stearate coating can give:

 

BulletImproved processability

BulletBetter dispersion

BulletReduced curing cycles

BulletHigher mechanical performance

BulletImproved extrudability

 

Water absorption of Polcarb™ 60S is especially low making this product suitable for cable insulations and for use in extruded products cured by low-pressure methods such as salt bath and fluidised bed.

 

Applications

 

Power Cable Insulation phr
Keltan720 100
Zinc oxide 5
Stearic acid 1
PoleStar™ 200R 75
Polcarb™ 60S 75
Vinyl silane 1.0
Sunpar 2280 25
Paraffin wax 5
Flectol H 1.5
Rhenofit TAC/S 2.0
Perkadox BC40 7.0
Low cost extrusion compound phr
Vistalon 3708 100
N550 Black 150
N762 Black 100
Polcarb™ 60 100
Sunpar 150 200
Zinc oxide 5
Stearic acid 1
Sulphur 2.5
MBT 1.5
TMTD 4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mechanical Properties phr
Tensile Strength (MPa) 8.5
Elongation at break (%) 270
Hardness (IRHD) 64
Volume resistivity at 20°C (ohm.cm) 1.2 x 1015
Mechanical Properties phr
Tensile Strength (MPa) 6.5
Elongation at break (%) 270
Hardness (IRHD) 65
Compression set at 70°C (%) 38.4

 

 

 

 

 

 

 

 

 

For detailed formulation advice please contact us

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©Imerys Minerals Ltd. 2012 | Registered office: Par Moor Centre - Par Moor Road - Par - Cornwall - PL24 2SQ UK | Company No: 269255