Rubber Moulds Vs Silicone Moulds – How to Choose According to Your Needs

paving moulds manufacturers

Are you in the planning stages of your paving blocks project? Do you need to decide which mould, rubber or silicone mould is more suitable for your process?

We often have customers requesting silicone moulds. While we do not produce silicone moulds, our paving moulds produce an equivalent quality of cast concrete products while keeping cost well below the cost of comparable silicone moulds.

More and more homeowners, do-it-yourselfers, builders, and landscapers are making their own manufactured stones today. You can now make stones, tiles, bricks, and pavers for a fraction of what you’ve been buying them for, thanks to companies that manufacture and market concrete molds directly to consumers and tradespeople through the Internet.

Now you can make these building products right in your garage, basement, for a shed for pennies each!

Each option has its own advantages and disadvantages. The advantage to JR Rubbers’ proprietary blend of materials is that you get a commercial grade mould designed to be used hundreds if not thousands of times.

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Our moulds are very robust in design and do not require the use of a release agent while most mould manufacturers recommend using a release agent. The lack of need for release agents also provides additional cost savings from both a material standpoint as well as a reduction in labor cost.

Rubber moulds work very effectively and are the “go-to” option for casting concrete pavers. In some cases, a release agent is not required when casting concrete in these moulds, but it depends greatly on the components of the concrete mix.

Using silicone rubbers may take away the need for release agents (which have the potential to affect the model); however, the oils from silicone rubbers also have the potential to affect the model in some way.

Platinum silicone mould rubbers can be appealing because of their great release properties (tin-cured silicones should not be considered for concrete as they shrink over time and deteriorate with age), but overall, we find that the advantages of rubber mould outweigh the advantages of silicone rubber for this paving block manufacturing application.

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In addition to robustness and cost savings, our moulds provide excellent texture and general appearance as would be expected from an equivalent silicone mould. We stand behind our product 100%. You can be assured that our moulds meet or exceed the requirements of the industry.

Efflorescence, which produces salt deposits on the surface of concrete, more often occurs when silicone rubber moulds are used for casting (in comparison to rubber moulds).

This white residue is aesthetically displeasing and to remove it, you may need to use solvents or other chemicals.

In line with this, the overall color quality of the cast parts seem to differ depending on the mould material; concrete cast in rubber moulds tend to display more vivid color, where colors may appear muted when casting in silicone rubber moulds.

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Silicone rubber moulds cost about twice as much as that of rubber moulds. This is because, by weight, it would require more silicone rubber than polyurethane rubber to create the same mould since silicone is denser.

Cured polyurethane rubbers exhibit physical properties that are generally “tougher” than silicones, so they are more resilient to wear and tear when moulds are used repeatedly for years.

Here at JR Rubbers, we often recommend the use of rubber to make moulds for concrete casting (e.g., concrete tiles, panels, pavers, bricks, countertops, edging, etc.). Established in 1993, we have been manufacturing moulds for wet cast concrete pavers/tiles, providing the complete solution for exterior flooring industry with the manufacture and the supply of moulds, paver machinery, setting chemicals and color oxides and complete technical assistance for paver production with in-plant training and onsite assistance for production.

Our range of products includes rubber moulds for Pavers/Tiles/Kerbs/Cover Blocks, polypropylene plastic paver moulds, mini paver plant, semi-mechanized paver plant, fully automatic paver plant and other customized products,

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Rubber Moulds and Its Advantages

rubber paver moulding

Raw materials like rubber, plastic, glass or metal are given different shapes using a mould, this process is known as moulding. A liquid raw material turns into solid when poured into a mould container. To avoid hasty wear and tear these containers are mainly made up of steel.

What is Rubber Paver Moulding?

The rubber paver mould manufacturers make a usable rubber product from untreated rubber or elastomers. On applying pressure on elastomers, they will return to their original shape because they are natural polymers bearing all elastic properties. Not only because of its malleability but also because of its varied utilities in industrial and domestic sectors they are broadly used by rubber paver mould manufacturers in India.   

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How to select rubber material?

Rubber compounds are of different types, each differs from one another. So for selecting the correct compound, you need to go for a selection process. For  achieving the best performance level following things should be kept in mind while selecting a rubber material:

  • Be aware with the main function of the part .i.e, whether it will transmit or absorb energy.
  • Check the material cost per part.
  • Choose according to the location i.e, inside or outside.
  • Select the place according to match its temperature requirements.
  • Do not expose it to chemicals.
  • Be aware of its physical properties and ensure its regulatory requirements.

What are the different types of rubber moulding?

Rubber moulds for paver tiles can be done in two different forms of moulding, one is injection moulding and the other is compression moulding.

tile molding

  • Injection Moulding

Under high pressure heated rubber compound or material is injected into the mould cavity, this process is known as injection rubber moulding.  The molten state material is placed inside the injection barrel. For creating rubber paver moulds in Indonesia injection moulding is the most well-versed way.

  • Injection moulding process.1) Into the injection barrel, an unseasonal rubber material in the form of a constant strip is ingested.2) In a temperature controlled barrel it is warmed by an auger screw. Once the rubber material accumulates the auger screw is pulled backward.3) By an injection press, the rubber material is inoculated into the mold cavities once the auger screw moves backward.

    4) When the mold is closed under high pressure the auger screw is pushed forward forcing the material into the mold cavities.

    5) When the material is cured in the heated mould the auger screw turns again to replace the injection barrel and the injection part is ready for next shot once the mould gets opened.

Advantages of Injection moulding

  • Rapid production
  • Modicum wastage of material
  • Scheme flexibility
  • Poor labor cost
  • Resilience in color and material

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    Compression Moulding

Rubber paver mould manufacturers in Bangalore place rubber material in the mould and close it under hydraulic pressure. Once the mould opens, you can remove the part from it or else you can trim the excess rubber from its part. Medium hardness compounds mainly make use of compression moulding. This process reduces the flash produced in rubber moulding process.

Advantages of compression moulding

  • Cheap tooling cost
  • Ideal for small production
  • Fair for big parts
  • No more material passage through sprues, runners, gates

As each and every process of moulding has its own advantages and disadvantages, it is most important to look into all requirements of the product while choosing suitable production. JR Rubber industries serve the finest quality rubber paver moulds for cover block, interlocking, paver tiles and so on as per the satisfaction of customers. We are the extraordinary suppliers of rubber products for years with an infinite number of collections. We also offer rubber moulds in its customized forms as per the requirements of our clients. We are always outfitted with a bulk and cost-effective range of products to provide our customers with an all-time service.

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