A Carbon Fibre Carabiner - Is It Possible?

by Virgil Scott Jan/2009
This article has been read 16,100 times

Interested in how climbing gear is currently made? UKC have an exciting video coming up - featuring the making of a carabiner in the DMM Llanberis factory. Watch this space!

Virgil Scott takes a look at carbon fibre carabiners. His research has led him to believe that the future of climbing gear lies in this area. Is he right?

Trying out different geometries and gate ideas, 56 kb

Carbon Fibre Carabiners - Is It Possible? by Virgill Scott

The lightest full size carabiners available weigh around 33 grams. A testament to this engineering feat, when shown a carabiner, an engineering professor at Imperial College assumed it was hollow because it felt so light in his hand! It has taken many years of incremental changes to reach this figure – but imagine if it could be reduced to 20 grams in one step. A 40% weight saving – which could also be applied to smaller carabiners such as the DMM Phantom (UKC Review) or CAMP Nano.

Composite materials are used in spaceships, jets, tennis rackets, boats, bicycles – and countless other applications. Why? Almost always for weight saving. Promisingly, much like the climbing industry, most of these applications previously used aluminium alloy because of its excellent strength to weight. A typical carbon fibre laminate has double the strength-to-weight ratio of carabiner aluminium.

Stress analysis to optimise designs, 28 kbStress analysis to optimise designs
© Virgil Scott
However, composites aren't without problems. Climbing gear must be able to cope with a very unusual combination of demands – sudden and very large forces, heavy abrasion from pulling down wet and sandy ropes, corrosion from salt-water, big temperature ranges (from -40°C on Everest to +50°C or more due to friction heating). As they are now, carabiners are amazingly robust and any modifications made must be considered very carefully. For example, would it be acceptable if a carabiner was 40% lighter but also wore out twice as fast from abrasion?

Having said that, it may not be necessary to make this compromise. Composite gears have been used in NASCAR racing, where wear characteristics are absolutely vital, and they are purportedly lighter and longer lasting than their metal counterparts. This is due to additives used in the plastic resins – much like the alloying process used for metals. It may also be possible to use hard layers or coatings to protect from wear.

A CAD model of the one-piece idea, 35 kbA CAD model of the one-piece idea
© Virgil Scott
Another issue is cost – composite materials are expensive. However, in current carabiner manufacture, material costs are only a small aspect of the overall production costs. Right now there is a multitude of steps involved in creating a carabiner – cutting, bending, forging, clipping, drilling, polishing, anodising. More processes means more manual labour and more equipment are required – which adds cost and time. A promising composite solution would involve using injection moulding.

Injection moulding is fast and automated – it would take minutes rather than hours to create each carabiner. Also, it may be possible to design a carabiner that can be made in a single step; this would require the gate to be integrated into the carabiner body so that the entire carabiner is made as a single component. The gate would be made out of a thin strip of material so that it could bend open. This would need to make use of a captive-eye design (where the carabiner cannot be cross-loaded) and would have to take advantage of the additional strength offered by composite materials to overcome the fact that it would essentially be continuously in the open-gate configuration. Even using a more conventional wire-gate design – injection moulding the carabiner body would cut out several steps in production.

A rapid prototyped model of the one-piece idea, 30 kbA rapid prototyped model of the one-piece idea
© Virgil Scott
The engineering barriers can, and will, be overcome – but there are other barriers. For decades, hardware manufacturers have been working with essentially the same materials, building up equipment and expertise related to steel and aluminium. The design and manufacturing approach with composites is very different – composite materials require new expertise in totally unfamiliar areas. It is very difficult for manufacturers to overcome the 'stick with what we know' mindset. It will require a significant investment of time and money to acquire the necessary skills and equipment and there will inevitably be a degree of risk. What if the market is not big enough to justify the R&D costs needed to create a composite carabiner? What if the end product is too expensive? What if consumers don't trust the unfamiliar materials?

It will take some bold steps to initiate the adoption of composites but the potential pay off is very great. Climbing gear is a dynamic and innovation led industry, even with the weight savings aside, being the first to produce a composite carabiner is likely to add value to a brand. This, plus the additional value of formidable weight savings, could make a market leading product.

Pete Robins with his new 'Phantom' at DMM, 112 kbPete Robins with his new 'Phantom' at DMM
Jack Geldard - Consulting Editor, May 2008
© Jack Geldard

CAMP Nano 23 quickdraw, 40 kbCAMP Nano 23 quickdraw
© Allcord

The Wild Country Xenon Lite

Phantom Quickdraw
A CAD model of a more conventionally gated design, 38 kbA CAD model of a more conventionally gated design
© Virgil Scott

Fact or fiction?

UKC got in touch with DMM of Llanberis to find out if carbon carabiners are pure fantasy, or whether they might actually be hitting our shelves, and our racks, any time soon.

Simon Marsh from DMM had this to say:

New materials are always interesting and certainly from a DMM perspective I would think history shows that we constantly push the boundaries - Predator, Terminator, Revolver and Shield to name only a few.”

We have certainly looked at carbon fibre in the past and indeed brought a couple of carbon fibre products (Deadman & Snow Stake) to the production stage before our partner, who was actually producing the units, went bust.”

We constantly look at new materials and do this at many and various levels of differentiation. We have been talking to a couple of companies about composite materials that could replace metal products for the last couple of years and it is a really exciting area.”

The Phantom
We have also been looking at new technologically advanced fabrics for use on harnesses for over 18 months. Some composite sail cloths have specifications that are very interesting - it just takes time to evaluate materials and end products thoroughly.”

Interested in how climbing gear is currently made? UKC have an exciting video coming up - featuring the making of a carabiner in the DMM Llanberis factory. Watch this space!

Links to featured manufacturers:

More information on carbon fibre carabiners is available on Virgil's Website

If you want to know what the future of climbing gear really is, why not read this futuristic UKC essay 'Perfect Partner' by Robert Walton, featuring some innovative and interesting technology...

UKC Articles and Gear Reviews by Virgil Scott
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