Technical Information

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Processing Of Rubber

Rubber, whether natural or synthetic, arrives at processor (fabricator) plants in large bales.

Once the rubber arrives at the factory, processing goes through following steps: compounding & mixing, shaping and vulcanizing.

First of all, Large bales of the Rubber is cut into small pieces by the Bale Cutter Machine.

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Compounding

The compounding is the first step of the Rubber Moulding Process. It decides the Properties of the final Rubber Products.

Compounding adds chemicals and other additives to customize the rubber for the intended use. All the chemicals which are to be added in the rubber are calculated as per the standard formulas.

Chemicals added during compounding react with the rubber during the vulcanizing process to stabilize the rubber polymers. Additional additives may include reinforcing fillers to enhance the properties of the rubber or non-reinforcing fillers to extend the rubber. The kind of filler used depends on the final product.

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Mixing

Mixing is a very important process. The mixture which is made ready in the Compounding stage, is thoroughly mixed in the Automatic machines.

Primary stage: Kneader Machine

Secondary stage: Mixing Mill

We have all the in-house set up for the Mixing of the compounds.

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Extrusion

Process consists of forcing highly plastic rubber through a series of screw extruders.

The Die is placed in the front of the machine to make the desired shape of the Rubber strip.

The extruded profile is in the unvulcanised form , which can be cured later in the Boiler or CV line.

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Vulcanization

completes the Moulding process.

Vulcanization creates the cross-connections between the polymers of rubber with the applied temperature & pressure.

After the specified time , The product is ejected from the Mould.

Technical Requirements

The following table will give you an idea about the various types of popular rubber available to make industrial products with their properties

Properties	NBR	EPDM	NEOPRENE	SILICONE	FLUORO SILICONE	VITON
Hardness, A	40-95	30-85	30-90	40-80	60-80	50-95
Heat Reasustance Max Cont. Deg. C	100	130	150	205	205	205
Low Temp Resistance	-20	-50	-35	-60	-80	-20
Oxidation Resistance	Good	Excellent	Very Good	Excellent	Excellent	Out- standing
Ozone and Weathering	Fair	Out- standing	Very Good	Out- standing	Out-standing	Out- standing
Oil Resistance	Excellent	Fair	Good	Excellent	Excellent	Excellent
Solvent:- Alcohol	Good	Good	Good	Good	Good	Good
-Acetone	Poor	Good	Fair	Fair	Poor	Poor
-Benzene	Poor	Poor	Poor	Poor	Good	Good
Chemical:- Acids	Good	Good	Good	Fair	Fair	Excellent
-Bases	Fair	Good	Fair	Fair	Fair	Good
Physical Strength	Good	Good	Good	Poor	Good	Good
Compression Set	Good	Good	Good	Good	Good	Good
Tear and Abrasion	Good	Good	Good	Poor	Poor	Good
Resilience	Good	Very Good	Vey Good	Fair	Fair	Poor
Gases Permeability	Good	Fairly Loe	Very Good	Good	Good	Very low
Electrical Strength	Poor	Excellent	Good	Excellent	Good	Good
Flame Resistance	Poor	Poor	Self Extinguishing	Good	Good	Good
Water Resistance	Good	Excellent	Good	Good	Good	Good