Follow us
Account Login

Email

Password

Forgot your password?
Free Sign Up

Featured Project

Beach House as Tree House

View more inspiration
General Resources
Why Wood Articles
What is...

Spruce-Pine-Fir (SPF)
Spruce-Pine-Fir, or SPF, is the generic name for a variety of softwood species, even-grained and yellowish-white in colour, imported from North America and used in housing construction frames.

Visit Glossary

Coast Grey Box | Eucalyptus bosistoana

Coast Grey Box is a highly durable Australian hardwood, which is pale brown in colour.

Coast Grey Box is a highly durable Australian hardwood used mainly for heavy construction and as round timber.

Coast Grey Box is a highly durable Australian hardwood often used for heavy construction applications and as round timber.

Other Names: Bosisto's Box, Gippsland Green Box

Overview
Properties
Description
Applications
Suppliers

Overview

Coast Grey Box is a tough, highly durable large Australian hardwood. It grows in eastern Victoria and along the southern and central coast of New South Wales.

Its heartwood is a pale brown with the sapwood paler in appearance. It has a fine and even texture and usually features an interlocked grain. Gum veins are rarely present. It is similar in appearance to Grey Box, Eucalyptus moluccana.

Coast Grey Box is also a highly dense species so it is quite difficult to work. It can be painted, stained and polished. Any machining or surface preparation should be done immediately prior to gluing. It is slow to dry but generally will not develop any surface checking. It is also satisfactory for steam bending.

Coast Grey Box is used for heavy construction, round timber and sleepers. Like Grey Box, it is mainly available in the areas it grows.

Properties

Shrinkage

	Very Low	Low	Medium	High	Very High
Tangential:
Tangential:					8.2
Radial:					> 5
Unit Movement:					0.42 %

Strength Group

	Very High	High	Reasonably High	Medium High	Medium	Reasonably Low	Low	Very Low
Unseasoned:	S1	S2	S3	S4	S5	S6	S7
Unseasoned:
Seasoned:	SD1	SD2	SD3	SD4	SD5	SD6	SD7	SD8
Seasoned:

Stress Grade

	Structural No. 1	Structural No. 2	Structural No. 3	Structural No. 4	Structural No. 5
Unseasoned:	F22	F22	F17	F14	F11
Seasoned:	F34	F34	F27	F22	F17

Density per Standard

Unseasoned:	1180 kg/m³
Seasoned:	1100 kg/m³

Joint Group

	Very High	High	Reasonably High	Medium	Low	Very Low
Unseasoned:	J1	J2	J3	J4	J5	J6
Unseasoned:
Seasoned:	JD1	JD2	JD3	JD4	JD5	JD6
Seasoned:

Colour

White, yellow, pale straw to light brown	Pink to pink brown	Light to dark red	Brown, chocolate, mottled or streaky

Mechanical Properties

Modulus of Rupture - Unseasoned:	103
Modulus of Rupture - Seasoned:	163
Modulus of Elasticity - Unseasoned:	17
Modulus of Elasticity - Seasoned:	21
Maximum Crushing Strength - Unseasoned:	50
Maximum Crushing Strength - Seasoned:	73
Impact - Unseasoned:	23
Impact - Seasoned:	26
Toughness - Unseasoned:	High - 25 Nm and above
Toughness - Seasoned:	High - 25 Nm and above
Hardness - Unseasoned:	10
Hardness - Seasoned:	13

Durability

	Low	Moderate	Reasonably High	High
	(0 - 5 yrs)	(5 - 15 yrs)	(15 - 25 yrs)	(more than 25 yrs)
In-Ground:
	(0 - 7 yrs)	(7 - 15 yrs)	(15 - 40 yrs)	(More than 40 yrs)
Above ground:
	(0 - 20 yrs, usually < 5)	(21 - 40 yrs)	(41 - 64 yrs)	(More than 60 yrs)
Marine Borer Resistance:

Lyctid Borer Susceptibility:	Susceptible
Termite Resistance:	Resistant

Fire Properties

	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
EFH Ignitibility:

	0	1	2	3	4	5	6	7	8	9	10
EFH Spread-of-Flame Index:
EFH Smoke-Developed Index:

	1 - non-combustible	2 - reasonably non-combustible	3 - slightly combustible	4 - combustible
Fire Properties Group Number:

Average Specific Extinction Area:	<250
Bushfire Resistance:	BAL 12.5 and 19 – All AS3959 required applications

Description

Botanical Name:	Eucalyptus bosistoana
Preferred Common Name:	Coast Grey Box
Other Names:	Bosisto's Box, Gippsland Green Box
Species Type:	Hardwood

Appearance

Coast Grey Box features heartwood that is pale brown, sometimes with a tinge of pink. The sapwood is paler in appearance. It has a fine, even texture and usually features an interlocked grain. Gum veins are rarely present.

Coast Grey Box is very similar in appearance to Grey Box, Eucalyptus moluccana.

Common Applications

Tough and highly durable, Coast Grey Box is mainly used for heavy engineering construction and round timber. It is also used for sleepers.

Common Form

Sawn

Workability

Coast Grey Box is a highly dense species so it is quite difficult to work. It can be painted, stained and polished. Any machining or surface preparation should be done immediately prior to gluing. It is slow to dry but generally will not develop any surface checking. Coast Grey Box is also satisfactory for steam bending.

Origin of Timber

NSW, VIC

Readily Available