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LightSpeed-12 is a dielectric 12-strand rope utilizing high-tenacity monofilament polypropylene fibers with an advanced coating solution. Perfect in environments where maximum electric isolation is required, LightSpeed-12 is effective in fiber optic installation and high voltage scenarios, such as near power lines and for jobs with outdoor and underground applications. A non-rotational construction with excellent strength characteristics compared to other polypropylene 3- or 4-strand ropes, LightSpeed-12 is manufactured according to ASTM F1701-12 (2018) and IEC 62192:2009. Manufactured according to ASTM F1701-12 (2018) & IEC 62192:2009

Product Code


Specific Gravity


Fiber (Core/cover)



12-Strand Class I

at Percent of break strength
10% 20% 30%
Elastic Elongation
1.10% 2.50% 3.80%

Hand Line

Excellent dielectric properties   •   Floats   •   Spliceable   •   Suitable for live working at voltages up to 800 kV rms

DIAM.  (INCH) 3/8 1/2 9/16 5/8 3/4
CIRC.  (INCH) 1 1/8 1 1/2 1 3/4 2 2 1/4
WEIGHT PER 100 FT.  (LBS) 3.1 3.8 5.1 7.7 9.1
AVG. STRENGTH  (LBS) 3,500 4,200 5,600 8,400 9,800
MIN. STRENGTH  (LBS) 3,200 3,800 5,000 7,600 8,800
DIAM.  (MM) 10 12 14 16 18
CIRC.  (MM) 27 36 42 48 54
WEIGHT PER 100 M  (KG) 4.6 5.7 7.6 11.5 13.5
AVG. STRENGTH  (KG) 1,600 1,900 2,500 3,800 4,400
MIN. STRENGTH  (KG) 1,400 1,700 2,300 3,400 4,000


Rope that is specifically identified as dielectric, indicating it meets the electrical performance properties defined by IEC 62192 or ASTM F1701-12, as noted on the product tag, is a very poor conductor of electric current. Dielectric rope is designed to provide superior electrical insulation and is suitable for live working by skilled persons at the power frequency system voltages up to and including 800 kV r.m.s. This rope is not intended for live working procedures under rain or snow. The rope has not been qualified for Direct Current (DC) conditions. Do not use the rope for DC conditions without first contacting Samson at the address or numbers provided on the first page of this Guide and, letting them know of your intended use and discussing with the Samson representative the testing it has done on the rope in DC conditions. During the manufacturing process, different additives are applied to give this rope excellent dielectric performance, negligible water absorption, and improved UV resistance if handled properly. To ensure the highest dielectric performance, it is recommended to keep the rope free from debris, and in good working condition. The rope should be thoroughly inspected prior to use, following Samson’s inspection guidelines. Although the rope is capable of use in high humidity conditions, it should not be used if it becomes wet or saturated with any liquid until it has been fully dried. Samson’s dielectric ropes are compatible with most dielectric field-testers, which after the first use may be used to confirm the rope’s dielectric performance prior to continued use. In addition to the standard selection, handling, and usage requirements for all synthetic ropes, store dielectric ropes away from UV and at temperatures below 85° Fahrenheit (30° Celsius). Contact with acids should be especially avoided. Inspect the rope regularly and discard if strands have any defects or signs of wear or breakage (even partial), and clean dielectric rope only with a dry cloth, never with solvents. Terminate and join dielectric rope according to Samson’s standard splicing instructions for Class I ropes as set forth in Samson’s splice manual found on Samson’s website at

The mechanical and physical properties of dielectric rope will remain in effect for at least five years from the date of manufacture when kept in its original packaging and stored according to manufacturer instructions.

The double triangle symbol means the rope meets or exceeds the electrical performance requirements of IEC 62192 as indicated on the product tag. Qualified Samson dielectric ropes also meet the electrical requirements of ASTM F1701-12.


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