DescriptionThe most common
commercial species of Grey Ironbark is Eucalyptus paniculata, which
is distributed from the far south coast of NSW to north of Coffs
Harbour. Another species also referred to as Grey Ironbark is E.
siderophloia. It is distributed from southern coastal NSW to
Maryborough in Queensland.
Ironbarks are a very
characteristic group of trees, so named on account of the thick,
compact, hard bark. The name however could equally apply to the
timber itself, for it is certainly the ironwood of the whole
Eucalyptus genus. The wood is very heavy, hard and compact, making
working with the timber difficult. It ishard to nail and planes with
difficulty. Microscopically, the fibres are seen to be very thick
walled, compact and closely compressed.
available Ironbark species in NSW can be broadly divided into Grey
and Red Ironbarks.
The heartwood of the Grey Ironbarks
ranges from light grey or light chocolate with some darker reds and
browns sometimes occurring. Sapwood is slightly lighter in colour.
Grey Ironbark may have various regional variations such as the
‘Black Ironbarks’ around Port Macquarie, which have similar light
colours with black narrow to broad streaks running through the
timber. Texture is moderately coarse and
The timber is very
hard to work, limiting some applications requiring fine detailing.
The heartwood is highly durable (Class 1), allowing a wide range of
external applications. The sapwood is not susceptible to Lyctid
attack. Applications include heavy engineering, marine structures,
poles, boat building, framework, flooring and decking. It was one of
the first species to be utilised by the early settlers in the
neighbourhood of Port Jackson, for bridging, house building, piles
and generally where great strength and durability were required. Definition