Revolutionary new high-strength guy ropes using Dyneema® Max Technology
Mastrant® M ropes using new Dyneema® Max Technology (by DSM) maximizes the scope of the world’s strongest fiber. Mastrant® is pioneering the use of high performance synthetic rope in permanently loaded applications. Designed specifically for mooring production facilities in deep waters, DSM’s new ‘ultra high strength at low weight’ Dyneema® DM20 fiber delivers unrivalled rope strength, stiffness, durability and longevity.
Laboratory tests demonstrate that ropes made from DM20 fiber retain the property characteristics of Dyneema®, even under long-term high tensions. Critical behavioral qualities, such as high static strength and stiffness, exceptional abrasion, fatigue and creep resistance enable a smaller, lighter rope to deliver improved performance and operational benefits. Dyneema® Max Technology performs significantly better than SK 78 on creep and thus is another step change versus all other HMPE (high-modulus polyethylene). At the same time it keeps the good properties of Dyneema® fiber, which are appreciated by many users. The breakthrough product now offers all the benefits of ropes made with Dyneema® also to the markets of permanently loaded applications like guying of towers, masts and antennas.
Why replace steel guywires?
Steel guying wires are still very common, however they are heavy, difficult to work with and their strength deteriorates with time due to corrosion and general ageing.
Their electrical conductivity is an undesirable feature as this interacts with the antennas and deteriorates their radiation pattern.
Thanks to the recent developments of materials, both amateur and professional users are changing over to non-conductive guys and ropes and will never go back to using the steel wires once the benefits are fully appreciated. The non-conductive synthetic fibres have all the necessary qualities: high strength, negligible elongation but with good flexibility, long life, low wet-ability, minimum bending radius giving the ability to tie knots, excellent UV radiation resistance, weather durability and resistance to acids and alkali.
MASTRANT® optimized lines are made from proven modern materials such as Polyester (Mastrant-P), Dyneema® (Mastrant-M, Mastrant-D and D-F2) and Vectran® (Mastrant-V). The range covers products for a variety of applications, from thin support lines used for tying wire antennas and beams, to guys for supporting small and portable masts and vertical antennas, to anchoring ropes for high antenna towers tens of metres high. The product line is supplemented by a wide range of stainless steel accessories.
The development, testing and quality control of all these products ensures a superior product delivering long life. They are subject to continuous verifying in real conditions in co-operation with many users.
"Is Mastrant made from Kevlar?"
People are used to using Kevlar for "strong ropes with small elongation". No matter what material the rope is made of. Kevlar (or Technora, Twaron, etc.) is a brand name for ropes from aramid fibres. Those fibers are susceptible to UV degradation so they are always protected with extruded outer protective jackets - for example Phillystran HPTG-I.
However, there is another material for ropes for mast guying - Ultra-High Molecular Weight Polyethylene; trade names are Dyneema or Spectra. It has excellent UV resistance, higher knot strength and much lower specific gravity in comparison with Kevlar or Vectran. Mastrant-M ropes using new Dyneema® Max Technology (by DSM) maximizes the scope of the world’s strongest fiber. Mastrant® is pioneering the use of high performance synthetic rope in permanently loaded applications. Designed specifically for mooring production facilities in deep waters, DSM’s new ‘ultra high strength at low weight’ Dyneema® DM20 fiber delivers unrivalled rope strength, stiffness, durability and longevity.
In 2008 we started to produce the new rope Mastrant-P. This is braided rope with twisted cores (core: Polyester, parallel-arranged twisted cores, cover: Polyester 12 or 16). It has lower strength and higher elongation than high-end ropes, but all other properties needed for guying are similar. Moreover, it has much higher knot strength and Mastrant-P is dramatically cheaper.
Design your own antenna support system
Precise design of the antenna support systems and their safety presents a difficult task for which no ready-made solution exists. Radio amateurs often simply use common sense and experience, sometimes relying on incomplete knowledge of the materials used. There has been no simple solution until now. Based on the development of the special Mastrant lines, a methodology has been designed for determining the necessary material specifications and calculating stress values for various parts of the antenna support systems and anchoring elements. Simply use our on-line calculator, which after entering the basic data, calculates the required values and provides recommendations on the choice of materials to use. This ensures that the antenna support system is designed to be safe and reliable under all conditions for many years to come. For details go to Calculations.
Comparison with steel wires