Choices, choices
Steel and aluminum alloy are the two most common materials used for carabiners used in rope access work. Each has its pros and cons in terms of strength, weight, durability, and corrosion resistance.
Steel Carabiners
Steel carabiners are known for their high strength and durability. They are able to withstand heavy loads and frequent use without deforming. However, steel carabiners tend to be heavier than aluminum alloy options.

Aluminum Alloy Carabiners
Aluminum alloy carabiners are lighter weight, making them ideal for applications where weight is a concern. However, they are not as strong as steel and can deform more easily under heavy loads. Aluminum alloy carabiners are more corrosion resistant, especially in wet environments.
Recommendations for Rope Access Technicians
For most rope access work, aluminum alloy carabiners are recommended due to their lighter weight. Brands like Rock Exotica and Petzl offer high quality aluminum alloy carabiners specifically designed for rope access.
For more information on selecting the right carabiners for your rope access needs, check out AHSRescue.com. Their team of experts can help you determine which carabiner material, style, and brand will work best for your job. Be sure to inspect and retire carabiners that show any signs of wear.
In summary, while steel carabiners are stronger, aluminum alloy options are a better choice for most rope access technicians due to their lighter weight and greater corrosion resistance. High-quality brands offer specialized aluminum alloy carabiners designed specifically for rope access work.
Sources
Smackdown: Steel Vs Aluminum Carabiners for Rock Climbing
Steel Vs. Aluminum Carabiners | Gone Outdoors | Your Adventure Awaits