• 09 APR 13
    Frame Materials

    Frame Materials

    The frame materials used in the production of modern spectacle frames are plastic, metal, or composite (combination of the two).

    Plastic

    Cellulose acetate (zylonite)

    Cellulose acetate is the most commonly used plastic in spectacle frame production. It is an inexpensive material and is easy to work with and comes in various colours, patterns and textures. It is an easy material to adjust but one disadvantage is that it becomes brittle with age.

    Nylon

    Nylon is a lightweight and virtually unbreakable material. Due to these factors many sports and safety spectales are produced using nylon. However it is a difficult material to adjust and is only available in dark colours. It does have the tendency to become brittle with time.

    Optyl

    This is a hypoallergenic material which is of benefit to patients that have a skin sensitivity. It is also lighter than cellulose acetate. It is a difficult material to adjust because it can return to its original moulded shape prior to adjustment. This material can break on adjustment if it is not heated properly.

    Polycarbonate

    Polycarbonate material has a high impact resistance, up to 10 times that of conventional plastic. Therefore it is the preferred choice of material for children’s, sport’s and safety spectacle frames.

    Metal

    Aluminium

    Aluminium is a light weight metal frame material but its has a disadvantage in that it is difficult to solder or weld and therefore not widely used.

    Cobalt

    Cobalt is usually used in a metal alloy. Usually used in high quality frames that are lightweight, flexible, durable and thin. It can be coated with various colours. It is an expensive material and therefore not used in frame manufacture very often.

    Monel

    Monel is a popular metal used to produce spectacle frames because it does not lose its strength even if it is hammered into various shapes. It can be made into a variety of colours.

    Nickel silver

    Nickel silver is a common metal used to produce the inner core of temples, end pieces, hinges and nose bridges. It is a brittle metal and therefore cannot be used in slender/thin frames.

    Phosphor bronze

    Phosphor bronze is a alloy made up of 95% copper. It is a flexible alloy and is commonly used in temple production.

    Stainless steel

    Stainless steel is a corrosion-resistant metal, however it is a difficult metal to work with in the manufacturing process of spectacles frames.

    Trilam

    Trilam is a very lightweight metal. However it is a memory metal i.e. retains its shape, that it makes it a difficult metal to adjust.

    Composites

    Carbon fiber graphite(CFG)

    Carbon fiber graphite is a combination of nylon and carbon that provides extra strength for metal frames. In its natural state it is black in colour, but it is now readily available in various colours.

    Copolyamide(MXP7)

    MXP7 is a blended nylon material used in the production of injection-moulding frames. It is a strong, lightweight and durable material. It retains its shape or form unless it is heated.

    Flexon7

    This is a proprietary material that is produced from a titanium-based alloy. It has a “memory” factor that allows it to be twisted and flexed but returns to its original shape afterwards. It is a very durable material and lighter in weight than other metal frames.

    Titanium

    Titanium is an aerospace technology material and is an excellent material for manufacturing of spectacle frames. Titanium is extremely strong, lightweight and hypoallergenic (benefits patients with skin sensitivity). Titanium can be classified as pure titanium or beta titanium.

    Pure titanium is more resistant to breakage and is not a metal alloy (in combination with other metals). The cost of a pure titanium frame is expensive because it is not a metal alloy.

    Beta titanium is lightweight, corrosion resistant and very flexible due to its metal alloy composition i.e. 74% pure titanium, 22% vanadium and 4%aluminium. Usually used in making of flexible temples, profile assemblies and wire bending parts of beta titanium frames. Therefore a beta titanium frame is not made of pure titanium but of a combination of titanium and other metals, the cost is therefore less than a pure titanium frame.

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Michele Hlava Optometrists

Service Excellence. We enjoy and are disciplined to a team approach, and look upon our patients and clients as part of our family.

Michele Hlava Optometrists
Physical Address
18 Dirkie Uys Street
Somerset West
7130

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P.O.Box 177
Somerset West
7129
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Vergelegen Plein Checkers centre
Sir Lowrys Pass Rd.
Somerset West
  • M.Hlava Optometrist Phone: +27 21 852 3667

  • M.Hlava Optometrist Fax: +27 21 851 7890

  • M.Hlava Email: aspec@iafrica.com

  • Vergelegen Phone: +27 21 851 1670

  • Vergelegen Fax: 086 542 1904

  • Vergelegen Email: aspec2@telkomsa.net