Australian Hardwood Timbers are among some of the world’s hardest by the internationally recognised and uiversally adopted Janka Hardness Ratings. Just as some people have the genetics that allow them to run fast, jump high, run long distances or bench press heavy weights, species of timber also have genetic dispositions that allow them to withstand intense heat, humidity, high traffic, high heels, water, etc.

Under the Janka Hardness Rating, simply, the higher the number the harder the wood. These ratings were determined using the Janka Hardness Test  which measures the side hardness measure of the  force required to embed a .444 inch steel ball to half its diameter into the wood. This is one of the best measures of the ability of wood species to withstand denting and wear. It is also a good indicator of how hard a species is to saw or nail.

A full list of the Janka Hardness Rating can be found by clicking here

Grey Ironbark is one of the world’s most durable hardwoods and its uses and applications know almost no bounds. Railway sleepers, bridge piers & pylons, wharves, decking, flooring, structural posts and beams, landscaping, retaining walls, Ironbark has an enormous amount of uses because of it’s strength and durability.

Using the Australian (metric) scale, the ratings can be categorised as such:

JANKA RATING HARDNESS
<5.5 Soft
5.5 – 7 Moderate
7 – 10 Hard
> 10 Very Hard

In summary, many of the species sold by us are among the hardest and most durable in the world.

Australian Hardwood Janka Hardness Rating
SPECIES METRIC JANKA RATING IMPERIAL JANKA RATING
Grey Ironbark & Grey Gum 14.0 3664
Red Ironbark 13.0 2922
Bloodwood 12.9 2900
Red Mahogany 12.0 2697
Spotted Gum 10.0 2473
Brushbox 9.1 2135
Blackbutt 8.9 2001
Tallowood 8.6 1933
Jarrah 8.5 1910
Blue Gum 8.1 1821