Polymer Knowledge Base

Hardie Polymers have been working with plastics since 1960. In that time we have amassed a wealth of knowledge on how polymers are used in different industrial sectors. The Hardies Knowledge Base is to inform the next generation of material processors and engineers.

Designing with Plastics

Designing with Plastics

Firstly, designing with plastics can be addressed under four inter-related headings: Function: Will it do the intended job? For how long? Form: Does it have the shape to: Do the function economically? Will it please the user? Does it suit …

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Polymer manufacturing processes

Introduction to Polymer Processing The conversion of raw polymers into finished products involves a series of steps. The first step consists of mixing additives into the polymer to achieve the required modification to the properties of the raw polymer. The …

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Introduction to Polymers

Introduction to Polymer Classification The family of plastics materials is closely related to two other important families of manufacturing materials, textile fibres and elastomers (rubber), in that they are all based on carbon (organic materials) and they consist of extremely …

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Polymer Articles

Coping with weld lines

            This article on weld lines was written by Dr.Charlie Geddes for Hardie Polymers. In injection moulding, weld lines (knit lines) form when two melt fronts meet.  If the melt fronts do not coalesce completely, …

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Will Styrenic thermoplastics evolve further to meet design demands ?

In a multiple choice pre-test I used for short courses for industry, some candidates were surprised to find that polystyrene had been around as a commercial material longer than polyethylene, polypropylene and nylon.  Today polystyrene still commands 10% of the …

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Polypropylene: the Workhorse of the Plastics Industry

Little did Karl Zeigler or Giulio Natta realise, 60 years ago, when they were developing a catalyst system to produce a useful thermoplastic from the inexpensive monomer, propylene, that their work would have such far reaching consequences. The early propylene …

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Where is Wear….. and Why.

Material loss (wear, abrasion loss) when two surfaces rub together, follows a similar pattern to friction.  One mechanism, ‘adhesion loss’, consists of transfer of material from one surface to another and is related to the chemical attraction between the two …

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What determines friction between thermoplastic components?

Friction is an important property for thermoplastics in bearings and gears but friction also has a part to play in assembly of plastic parts (snap-fit and interference-fit) and ejection during moulding. When two surfaces rub together the resisting force is …

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Polyacetal (POM): When to Select Homopolymer or Copolymer?

The production of stable thermoplastics from formaldehyde was discovered around 60 years ago, using two independent approaches.  To prevent unzipping of the polymer chains at high temperature, DuPont used an end cap mechanism while Celanese opted for incorporation of a …

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Creepy things can happen with long term loading of thermoplastics.

Deformation defined Deformation is defined as the change in the shape of a body caused by the application of a force (stress). It is proportional to the stress applied within the elastic limits of the material. This article that follows was …

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