Since LOOK’s beginning in the bicycle world, the choice of fabrication material has been emphasized on carbon.
This historic choice, which makes LOOK one of the few sport composite pioneers, is justified by the inherent characteristics of different carbon fiber.
The most important being its strong correlation between its stretching resistance and stiffness for very little weight. (Module Youth Specific, see table below).
The excellent performance of carbon epoxy composites to aging equally contributes to its choice as the ideal material for the fabrication of bicycle frames and forks.
Moreover, carbon fibers have a different behaviors based on their orientation.
One defines carbon composition (fiber type, orientation and quantity) for each layer in a very precise manner according to how the product will be used.
For over 30 years, LOOK has developed a unique expertise and a vast experience of combining different types of fibers to achieve specific desired properties.
We know how to vary the parameters of carbon composition to give a product a desired behavior.
The impregnated carbon sheets developed in France, according to LOOK’s own experience, have characteristics and an application close to those of aeronautics, aerospace or automotive sports.
DIFFERENT TYPES OF FIBERS:
HR: High Resistance.
Fibers obtained by the shortest carbonization process. Their rigidity is the weakest of the family but they benefit from a good stretch resistance before rupture, which makes it a useful component for product durability. Products made solely from HR fibers are heavier because more material is needed to obtain the desired stiffness.
HM: High Modulus.
“High-end” fibers. Their stiffness rating is very high, about double that of HR. These fibers must however be used wisely because they can generate products more susceptible to breaking. HM fibers allow added rigidity without the weight.
IM: Intermediate Modulus.
They have good resistance and fall somewhere between HM and HR of which they are a good complement.
Sheets of pre-impregnated carbon exist in two forms:
Fibers woven or braided, in multiple directions.
The carbon fibers are woven in various patterns based on
their destined use. Often these sheets are reserved as exteriors of molded products because they are seamless and more aesthetically pleasing.
Unidirectional fibers sheets, also called UD:
The carbon fibers are all orientated in the same direction on the sheet. A tube or any other carbon fabricated product, is made up of a succession of layers. Skill in manipulating these layers, a principal fabrication secret, is one of LOOK’s strengths and lies in the choice of fiber orientation for each layer. This allows a very precise control over the desired behavior for each manufactured piece.