The Importance of the ASTM B-987 Standard for
Carbon Fiber Core Conductors
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Sep 2021
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CTC Global is the privately held power grid solutions company whose
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American Society for Testing and Materials (ASTM)
While patents offer some protection for Companies that painstakingly develop, test and commercialize new
products and technologies, its not uncommon for ‘good products’ to be replicated by competitors. To protect
Consumers, standards and test protocols are frequently developed to help ensure that products and product
replications perform as intended and are produced consistently.
ASTM International (formerly known as American Society for Testing and Materials), is an international
standards organization that develops and publishes technical standards for a wide range of materials,
products, systems, and services for virtually every industry. Currently 12,575 ASTM Standards exist to protect
Consumers and ensure product quality and consistancy.
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ASTM Standard B-987
ASTM Standard B-987 “Standard Specification for Carbon Fiber Thermoset Polymer Matrix Composite Core
(CFC) for use in Overhead Electrical Conductors” offers a plethora of performance and test protocols that are
critical to the performance, integrity and longevity of carbon fiber cores used in overhead electrical
conductors that must perform reliably in extremely harsh environmental conditions for decades.
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ASTM Standard B-987
While corrosion of aluminum and steel used in legacy ACSR
conductors will occur in wet conditions, which can be exacerbated
by salt air, industrial or agricultural pollutants, galvanic corrosion
can also occur. Galvanic corrosion is an electrochemical process in
which one metal corrodes preferentially (and at an accelerated
rate) when in contact with a different type of metal in the
presence of an electrolyte, such as water.
While steel core wires are often coated with zinc to reduce the
rate of galvanic corrosion between the conductor’s core and
aluminum strands, the risk of galvanic corrosion with carbon fiber
cores is far greater due to their substantial difference in electrode
potential as shown in the chart below.
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ASTM Standard B-987
While newcomers to the world of carbon fiber composites may not fully understand this phenomenon,
lessons have been learned the hard way in the aerospace and other industries. If you are considering
carbon fiber core conductors, please be advised that adherence to the established ASTM B-987 Standard -
and especially its requirement for a robust non-conductive galvanic barrier - can mean the difference
between a conductor that lasts many decades in use or one that fails and falls prematurely. If you have any
questions, please contact us at [email protected]
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