How Silton Makes Your Component. Rubber Mixing, Moulding, Extrusion & QC | Silton Rubber Skip to content
The Process · Raw Polymer → Finished Component

How Silton makesyour component.

Every component we ship is compounded, tested, shaped and inspected at our own plants in Howrah. Scroll down the line.

01

Drawings. Samples. 3D Models.
Or Leave the Design to Us.

Send a drawing, a sample or a 3D CAD file (STEP, IGES, Parasolid, DXF or PDF). Or simply tell us what you need and leave the design to us. We study the application (temperature, media, ingress rating, closure force) and select the compound best suited to it.

Choosing the right compound is the single biggest factor in a long-lasting, failure-proof product. It is what lets a part outlast its maintenance schedule: Fit & Forget.

Drawing · Sample · 3D CAD (STEP · IGES · Parasolid) No Design? Leave It to Us Application Engineering Silicone · EPDM · FKM · NBR
02

Compound Mixing

The selected compound is mixed in a dispersion kneader under high pressure and controlled temperature, dosed to hit the target hardness, tensile strength and elongation, then finished on a two-roll mill into a homogeneous sheet.

Dispersion Kneader Two-Roll Mill Hardness · Tensile · Elongation
25 litre dispersion kneader with control panel at the Silton Rubber plant, Howrah 16 by 42 inch two-roll mixing mill
03

Compound Testing

No batch reaches production untested. A rheometer plots the cure curve of every mix; hardness, tensile strength, elongation, density and dispersion are verified against the specification before release.

Rheometer Shore A Hardness Tensile Strength Elongation at Break IS / BS / ASTM
FF moving die rheometer plotting the cure curve of a rubber batch Muffle furnace for ash and filler content testing Hot-air aging ovens for accelerated heat-ageing tests
04

Tooling

From your drawing, or reverse-engineered from your sample, the component is modelled in 3D CAD. Our CNC toolroom then machines the steel as per the manufacturing process best suited for your component.

3D CAD Model CNC Toolroom Reverse Engineering MS · EN31 · SS
05

The Fork

The component decides the die. Discrete geometries call for a moulding die, bolted into a hydraulic press. Components that can be extruded and finished downstream get an extrusion die, fitted to the extruder head.

Lane A · 06

Compression Moulding

The moulding die from the toolroom is bolted into a hydraulic press. Compound blanks cure inside it under heat and pressure. The part is ejected, then flash trimmed.

Lane B · 06

Extrusion & Joining

The extrusion die from the toolroom is fitted to the extruder head. The screw conveys compound through it. The shaped profile cures in a 70 ft hot-air vulcanizing oven. Cut lengths are joined end-to-end into jointless, endless gaskets.

07

Quality Control

Whether moulded or extruded, before dispatch all products go through dimensional inspection against IS, BS and ASTM standards and a visual check, followed by documented dispatch.

Dimensional QC IS / BS / ASTM Documented Dispatch

Ready when you are.

Send a drawing, sample or spec. Samples turned around extremely quickly.

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