Kernmantle rope consists of twisted parallel fibers (the kern) surrounded by a
tightly braided sheath (the mantle). The core fibers provide the majority (about 70%) of the rope’s strength. The sheath is tightly braided providing signficantly higher abrasion resistance. There are two distinct types of kernmantle: dynamic and static. Dynamic is used for recreational climbing due to its high shock absorption capabilities. Static kernmantle has very low stretch and works well for industrial applications. Due to its construction, it remains round through descent devices and allows minimal twist on the rope. The properties of static kernmantle make it ideal for use as a life line or descent line.
3-Strand ropes are an inexpensive
rope option. They tend to have a lower breaking strength than double braid or kernmantle, so a larger diameter must be used to achieve the same strength. Due to their construction, 3-Strand ropes have a tendency to rotate under load and provide less abrasion resistance. These characteristics make it a poor load line. With regard to safety and working at height, 3-Strand is most commonly used as a lifeline due to compliance with OSHA requirements and compatibility with 5/8” rope grabs.
Double braided rope is, as the name implies, a braided core surrounded by a braided sheath. The inner and outer braids are generally designed to share the load equally with very low elongation. Double braid rope remains round under tension, imparts no rotational force when loaded and has a soft hand. These characteristics make it ideal for use as a load rope.
As ropes get thicker, they get stronger. But there’s a
misconception that to be as safe as possible you should get the thickest rope available. In reality, your rigging is only as strong as your weakest component. The capstan, shackles, slings, blocks, and rope all must be considered. If you’re using a 1,000 pound capstan hoist, most 1/2” Double Braids have an MBS high enough to safely handle the maximum load for the hoist; even with the safety factor, and any loss of strength due to knots, termination plates, or sewn eyes. While a 5/8” rope has a higher breaking strength, it would not matter since the hoist is only capable of lifting 1,000 pounds. Another thing to consider is the sheave diameter of the blocks being used. There are many options which can handle 1/2” synthetic rope, but few exist that are strong enough to justify 5/8” rope.
Each time you use your rope, you should perform a visual inspection to ensure it’s safe to use. Check for cuts, nicks, burns, excess fraying, ?at or uneven spots, burns, harness, glossing, discoloration from sun exposure or chemicals, or inconsistencies in the rope. Refer to the manufacturers recommendations for complete inspection and usage instructions. Use a rope log, like the one available on www.safespan.cn/knowledge-base to keep a complete record of inspections. Another practice which is becoming more common is
Individual serial numbers for rope. useful to document when a rope goes into service, as well as track inspections. Have additional rope questions? Give our Gear Experts
Polyester rope, and is the ideal rope for use in rescue
kits, vertical lifelines, and ascent/descent rope access work. Developed alongside the people that use static rope every day to be the ultimate kernmantle rope. PSK is durable, extremely strong, and has very low stretch. The rope has extremely high resistance to abrasion thanks to the ?rm, smooth sheath. This also reduces the risk of debris working its way into the core, which could impact the strength and handling properties. This rope also performs consistently regardless of condition. Wet or dry, hot or cold, the polyester construction allows PSK to operate as expected every time. It’s available in 7/16” or ?” in 5 different colors to allow easy identi cation of rescue, lifelines, or work positioning lines. Alternatively users can color code their rope by length. PSK is available with or without sew eyes, however most stock ropes will have eyes included.
Extremely low stretch
Firm, smooth sheath
mitigates debris penetration, and increases durability
Multiuse - Perfect for rescue,
vertical lifelines, and ascent/descent
Operates consistently in wet and dry conditions
Diameter： 12mm BL 6750LB
nylon and excel in many applications, including rope access, technical rescue, rigging, and tactical operations. They are designed with a high denier and a tight, durable sheath to reduce stiffness; work well through gear, and provide smooth rappels. Sterling’s Better Braid Technology matches their unique thermodynamic yarn and twist in the core to create a strong resilient rope. These ropes are easy to knot, will stay round, and have optimal elongation when loaded. Engineered and certi?ed to the highest standards, Sterling’s Super Static 2 ropes have been ？eld tested, used and proven by the top instructors, rescue personnel, and rope technicians
Key Features: 100% nylon low stretch ? 41/59 sheath/core ratio yields best durability and great
PMI CLASSIC PR
PMI’s Classic EZ-Bend 16-carrier construction combined with the toughest nylon on the market makes PMI ropes some of the toughest in the world. PMI Classic 16-carrier ropes will always beat 32, 40, and 48-carrier designs made with lesser quality nylons hands down in abrasion and real-world durability tests. Although all diameters of PMI Classic rope are 16-carrier sheath design, the denier (thickness) of each diameter’s sheath is different. It is carefully designed to provide the maximum abrasion resistance, “grab” the core to minimize sheath slippage, and provide the desired hand for the intended applications.
Key Features: NFPA Certified ? 16-carrier construction ? CI1801 ? Third party certified by UL (Underwriters Laboratories) ? CE ? Torsionally balanced, continuous filament nylon
Diameter： 11mm BL 6000LB
This high performance rope features superior strength, low weight, and low speci?c gravity. Unaffected by oil and common chemicals, this high strength rope is easily spliced, exhibits low ?ex fatigue, near zero creep, excellent abrasion resistance with a low elongation-to-break ratio. Loadsharing and staggering failure built in can eliminate dangerous backlash. The ?ber grades used in this rope are SK60, SK65, SK75 and SK78. Additional protection is provided by urethane coating. Eyes are hand-spliced along with polyester chafe guards. Break strength remains constant in wet or dry conditions, making this the perfect choice for heavy duty winch line. With a speci?c gravity of 0.98, this rope ?oats!
Key Features:Low flex fatigue ? Near zero creep ? High UV resistance ? Floats on water ?
Eliminates backlash ? 6% elongation at break ? Excellent abrasion resistance ? 3x stronger than
Diameter： 6.5mm BL 8400LB
|FIBRES||POLYAMIDE 6 & 6.6 (PA)||Polyester (PES)||POLYPROPYLENEMultifilament (PP)||POLYPROYLENE(HIGH TENACITY) (PP)||POLYETHYLENE (PE)||High Modulus POLYETHYLENE (UHMWPE)||ARAMID||Liquid Crystal Polymer (LCP)||PBO|
|BRAND NAME||Nylon® Perlon® Enkalon®||Diolen® Treveria®
|Hostalen® Softlene® Leolene®||Leolene® Arova® Betelon®||Lupolen® Vestalen® Wetalen®||Dyneema® Spectra®||Twaron® Technora® Kevlar® Heracron®||Vectran®||Zylon®|
|TENACITY OF YARN CN/dTex||7-9||7-9||App.6||App.8||App.4,5||35||20-25||20||37|
|REDUCTION IN TENACITY WHEN WET%||5-10||0||0||0||0||0||0||0||0|
|WATER ABSORPTION %||1-7||0,5-2||0||0||0||0||2-5||1||0,6|
|KNOT STABILTY %||60-65||55-60||55-65||55-65||50-60||35-50||30-35||30-50||35-55|
|UV RESISTANCE||VERY GOOD||EXCELLENT||GOOD ONLY WHEN TREAT||GOOD ONLY WHEN TREAT||GOOD||EXCELLENT||POOR||POOR||POOR|
|CREEP||SLIGHT CREEP UNDER LOAD||HARDLY MEASURABLE||CREEPS AT HIGH LOADS||CREEPS AT HIGH LOADS||CREEPS AT HIGH LOADS||CREEPS AT HIGH LOADS||HARDLY MEASURABLE||IMMEASURABLE||IMMEASURABLE|
|RESISTANCE TO ABRASION||EXCELLENT||EXCELLENT||SUFFICIENT||SUFFICIENT||SUFFICIENT||VERY GOOD||UNSATISFACTORY||GOOD||UNSATISFACTORY|
|WASHING TEMPERATURE °C||50-60||50-60||30||30||30||30||80-90||60||50|
|RESISTANCE TO ACIDS %||GOOD||GOOD||VERY GOOD||VERY GOOD||EXCELLENT||EXCELLENT||PARTIALLY GOOD RESISTANCE||EXCELLENT||GOOD|
|RESISTANCE TO PETROLEUM BASED PRODUCTS||EXCELLENT||EXCELLENT||EXCELLENT||EXCELLENT||EXCELLENT||EXCELLENT||EXCELLENT||EXCELLENT||EXCELLENT|
|RESISTANCE TO SOLVENTS||FORMIC ACID&ACETIC ACID AT HIGH-TEMPERATURE||Phenols, Cresols Zinc Chloride||MINIMAL REACTION||MINIMAL REACTION||MINIMAL REACTION||MINIMAL REACTION||MINIMAL REACTION||MINIMAL REACTION||MINIMAL REACTION|
|RESISTANCE TO ALKALI||GOOD RESISTANT AGAINST WEAK SOLUTIONS||GOOD AT ROOM TEMPERATURE||GOOD RESISTANT AGAINST WEAK SOLUTION||GOOD RESISTANT WEAK SOLUTION||EXCELLENT||EXCELLENT||PARTIALLY GOOD||VERY GOOD||VERY GOOD|
|INSULATING PROPERTIES||VERY GOOD||VERY GOOD||EXCELLENT||EXCELLENT||EXCELLENT||EXCELLENT||EXCELLENT||EXCELLENT||EXCELLENT|
|HIGHEST TEMPARATUREı °C||130||170||80||80||70||70||350||200||500|
|MELTING POINT °C||215-260||225||170||170||150||140||500 Decomposes||280||650 Decomposes|