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Guy ropes

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®. 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 “high strength ropes with lower elongation". No matter what material the rope is made of. Kevlar (or Technora, Twaron, etc.) are brand names for aramid fibres. Those fibres 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 (UHMwPE); trade names are Dyneem® or Spectra®. It has excellent UV resistance, high knot strength and low specific gravity. 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.

Specification of the products 

Explanations of terms in columns can be found below the table. In case of any questions feel free to contact us via e-mail at info [at] mastrant.com.

ProductDiameterStrengthSWLElong.WeightPrice EUR (inc. VAT)e-shop
mminchdaN, ~kg%g/mreel 100m (330ft)reel 31m (102ft)1m (3.3ft)
Mastrant-P

2 3/32 100 30 2.4 2 14 - 0.20
3 1/8 200 60 2.4 5 20 7 0.28
4 5/32 400 120 2.4 15 30 12 0.39
5 3/16 500 150 2.4 20 44 - 0.57
6 1/4 850 255 2.4 33 73 - 0.95
8 5/16 1300 390 2.4 49 92 - 1.20
10 3/8 1900 570 2.4 71 123 - 1.60
12 1/2 2200 660 2.4 95 165 - 2.15
14 9/16 3200 960 2.4 137 210 - 2.73
Mastrant-M

1 2/32 100 30 0.6 1.4 28 - 0.34
2 3/32 250 75 1.0 4 33 12 0.40
3 1/8 390 117 1.0 7 55 20 0.66
4 5/32 900 270 0.8 11 110 - 1.32
5 3/16 1150 345 1.6 21 173 - 2.08
6 1/4 1850 555 0.7 32 220 - 2.64
8 5/16 2600 780 0.9 45 310 - 3.72
10 3/8 3850 1155 0.9 82 540 - 6.48
12 1/2 5500 1650 1.2 101 890 - 10.68
Mastrant-D (discontinued)

2 3/32 200 60 1.2 4        
3 1/8 400 120 1.2 7        
4 5/32 800 240 1.2 14        
5 3/16 1150 345 1.2 21        
6 1/4 1800 540 1.2 34        
8 5/16 2600 780 1.2 46        
10 3/8 4000 1200 1.2 57        
12 1/2 6800 2040 1.2 90        
D-F1/D-F2

4 5/32 1700 510 0.54 9 210   2.52
5 3/16 2900 870 0.54 16 330   3.96
6 1/4 3700 1110 0.54 22 470   5.64
8 5/16 7500 2250 0.54 44 910   10.92
10 3/8 9900 2970 0.54 75 1490   17.88
12 1/2 17000 5100 0.54 96 1890   22.68
14 9/16 24000 7200 0.54 135 2600   31.20
16 5/8 28000 8400 0.54 153 3000   36.00

Strength = breaking strength of the rope in ideal circumstances
SWL = Safe working load. Recommended 30 % of the strength
1 daN = 10 N, about 1 kg
Mastrant are braided ropes with twisted cores. All have cover from Polyester
Dyneema® is brand of DSM for Ultra-High Molecular Weight Polyethylene
Mastrant-M ropes use new Dyneema® Max Technology fibres DM20
We supply any length of the rope, the reels (100m, 200m and several types in 31m) are discounted.

 

Mastrant-M

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 SK78 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.

Specification of rope product lines

Mastrant-P

  • Construction: Braided rope with twisted cores
  • Core: Polyester, parallel-arranged twisted cores
  • Cover: Polyester 12 or 16 (depending on the diameter)
  • Safe temperature: -110 °C (-166 °F) to 120 °C (248 °F)

Mastrant-M

  • Construction: Double braided rope
  • Core: 100% Dyneema DM20, braided
  • Inner cover: Polyester staple (only on ropes with diameters from 6 mm and up)
  • Outer cover: Polyester 12, 16, 24 or 40 (depending on the diam.)
  • Safe temperature: -110 °C (-166 °F) to 90 °C (194 °F)

Mastrant-D (discontinued)

  • Construction: Double braided rope
  • Core: 100% Dyneema SK75, braided
  • Inner cover: Polyester staple (only on ropes with diameters from 6 mm and up)
  • Outer cover: Polyester 12, 16, 24 or 40 (depending on the diam.)
  • Safe temperature: -110 °C (-166 °F) to 90 °C (194 °F)

D-F2

  • Construction: 12-strand braided heat set rope
  • Material: 100% Dyneema SK78, special surface finish
  • Safe temperature: -110 °C (-166 °F) to 90 °C (194 °F)

Comparison of Mastrant ropes features

graf pevnost 2 en

Comparison with steel wires

graf pevnost 1 en

graf vaha en

Our direct competitor: hamrope

News

  • Thread Rods 17. 11. 2017

    We have added to our assortment (hardware section) very useful material for all who build their antennas yourself. It is stainless steel (AISI 316 - A4) thread rods 1 m long in sizes M5 to M12. 

     
  • "M1" again available! 27. 7. 2017

    After huge demand followed sold-out we have ropes Mastrant-M, 1 mm, in stock again:

     
  • 200m rolls of ropes 11. 9. 2016

    We extended our assortment by 200m (660 ft) rolls of all ropes and 500m (1650 ft) rolls of P 3, 4 and 5 mm.

     
Read more