We use many different high tenacity synthetic fibers, or combinations of materials, in our rope and netting products.
The different high tenacity fibers are roughly divided into two groups:
Most well known conventional materials are Polyamide (nylon), Polyester, Polyethylene and Polypropylene.
High Modulus fibers are much stronger than conventional fibers. Tensile strength and stretch are comparable to those of steel wire, but with a much lower weight. Rope and netting made from these fibers are lighter and easier to handle.
Van Beelen Group works with several High Modulus fibers:
Polyamide (nylon) has the highest elasticity of all conventional materials. It has good temperature resistance and abrasion resistance is higher than that of polyester. When wet, the material loses 10-15% of its strength.
Of all conventional materials, polyester has relatively the highest coëfficiënt of friction and the highest melting point (250° C). Although nylon has a higher abrasion resistance, polyester is durable because it does not lose strength rapidly due to cyclic loading and because of the high UV resistance. Tensile strength is high, wet and dry strength are equal.
Polyethylene is the most common plastic. For our products we use HDPE, a high density polyethylene with the highest strength to density ratio. Melting point is relatively low, 120°C. Elasticity is also much lower than nylon and polyester. Polyethylene floats, specific weight is 0.95. Prolonged exposure to UV can cause polyethylene fibres to desintegrate.
This is DSM's HMPE, High Modulus Polyethylene, branded as Dyneema®. Because of the extremely long molecular chains this material combines extremely high strength with minimum weight. It is up to 15 times stronger than quality steel, on a weight for weight basis. Dyneema® has a high abrasion and cut resistance, making it very suitable for use in rope and netting. Dyneema® floats, and is resistant to moisture, UV light, and chemicals.
Technora® is a para-aramid fiber made from co-polymers. The material has a high strength, weight for weight it is 8 times stronger than steel. Other performance properties are: good fatigue resistance, long-term dimensional stability and excellent resistance to corrosion, heat, chemicals and saltwater. With a thermal decomposition threshold of 500ºC, Technora® can be used at 200ºC for long periods. The low creep makes Technora® suitable for static applications.
Vectran® is a yarn spun from liquid crystal polymer (LCP). The material has a high strength and rigidity. Weight for weight it is 5 times stronger than steel. Its performance properties are: excellent creep resistance, high abrasion and cut resistance, minimal moisture absorption. Melting point lies at 330ºC.