Please note that we only supply polymer in granular form for Injection Moulding or Extrusion applications. We do not supply polymer in rod, sheet or block form.

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    Looking for colour stability in plastics for outdoor exposure ?

    When it comes to outdoor exposure, ABS (acrylonitrile-butadiene-styrene) struggles a bit because the butadiene in the rubbery phase is prone to oxidation and yellowing on exposure to uv light, particularly after heat ageing.  This makes it difficult to maintain brilliant whites and bright colours with ABS.

    107-front-grille outdoor exposure

    Blending an acrylate rubber with the styrene-acrylonitrile rigid phase, gives acrylic-styrene-acrylonitrile (ASA). The weathering resistance is greatly improved. Also retained are the other attractive properties of ABS – toughness, high gloss finish, friendly processing and low mould shrinkage.

    In the same way that blending ABS with Polycarbonate (PC) increases the high temperature working limits by up to 20 degrees celsius and improves fire performance ratings, PC-ASA blends not only improve heat resistance and fire performance, compared to ASA itself, but has the added benefit of good weathering resistance and full colour choice, compared to PC-ABS.

    Automotive manufacturers have spotted that PC-ASA blends for grilles and also internal components in cars and trucks do not require the additional cost of painting. Healthcare, consumer electronics, electrical equipment and also street furniture are other markets that have seen the benefits of PC-ASA.

    Registered Trade names:   PC-ASA:  Bayblend, Geloy, Luran S

    PC-ABS:  Bayblend, Cycoloy, Pulse

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    Coping with weld lines

    In injection moulding, weld lines (knit lines) form when two melt fronts meet. If the melt fronts do not coalesce completely, at best there will be a cosmetic flaw. At worst there will be a mechanical weak-spot, with strengths of the order of 10 - 90 % of the material potential.

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    What determines friction between thermoplastic components?

    Friction is an important property for thermoplastics in bearings and gears but also has a part to play in assembly of plastic parts (snap-fit and interference-fit) and ejection during moulding.

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    Polypropylene: the Workhorse of the Plastics Industry

    Polypropylene. 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.

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    What makes medical grade plastics so special?

    Toughness and transparency are important properties for the constituents of intravenous lines.

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    The Long and the Short of Fibre Reinforcement of Thermoplastics

    Fibre Reinforcement. The advantages of adding glass fibre to thermoplastics to increase stiffness (modulus), strength, heat distortion resistance and dimensional stability are well known.

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    What causes mouldings (and moulders) to be off-colour?

    When mouldings are not the intended colour, the first thing to check is the raw material, particularly the dosing rate, if you are using masterbatch, and the quality of regrind.

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    Transparent ABS can be a clear winner

    Transparent ABS. Mentioning transparency in the context of ABS moulding materials can raise a few eyebrows. This is because ABS is normally taken to be opaque and indeed the vast majority of grades of ABS are opaque.

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    Understanding the difference between SBS & SEBS thermoplastic elastomers?

    The difference between SBS and SEBS thermoplastic elastomers explained.

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    Is MFR really much help to moulders these days ?

    Often a moulder has to change material grades. One of the first properties to be consulted on the new data sheet is usually the MFR. This is to establish if the new grade has the same melt viscosity performance.

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    What gives Moulders a Warped View on Life?

    Warping is one of the most frustrating injection moulding faults. This is because it does not always appear immediately, the causes are complex and prevention is difficult.

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