Peppermint, Narrow-leaved

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Narrow-leaved peppermint is a member of a family of eucalypts used in the production of oils. It grows in the mountainous areas of New South Wales and Victoria, and in Tasmania. Although many members of the peppermint family are not suitable for use in construction, the narrow-leaved peppermint has been used for construction, fencing, joinery, outbuildings, handles, sporting goods, and novelties.

The heartwood is pale to light brown, and the sapwood slightly lighter but not readily discernible. The grain is straight or interlocked, and the texture is even and of medium fineness. Although gun veins are common in the narrow-leaved peppermint, they are rather less so in this timber than in other members of the peppermint species, though if present they can cause problems in working the timber.

The heartwood of narrow-leaved peppermint is moderately durable, and the sapwood is susceptible to lyctid borer, though not to termites. Narrow-leaved peppermint works fairly easily with a reduced cutter angle. Pre-boring is necessary. The timber glues well and comes to a reasonable finish, though gum veins are common and can cause problems.

Appearance

The texture is even and of medium fineness, and the grain is straight or interlocked. The heartwood is pale to light brown, while the sapwood rather lighter but not readily discernible. Although gum veins are common in the narrow-leaved peppermint, they are rather less so than in other members of the peppermint species, though if present they can cause problems in working the timber.

Common Applications

Narrow-leaved peppermint is used for general construction, fencing, joinery, outbuildings, handles, sporting goods and novelties.

Common Form

Sawn

Workability

If cutter angles are reduced, narrow-leaved peppermint can be worked fairly easily. Pre-boring is necessary. Gum veins are common and can cause problems, though the timber glues well and comes to a reasonable finish.

Origin of Timber

NSW

Availability - Further Information

Narrow-leaved Peppermint is seldom available commercially.

Availability - Further Information

Native Forest

Shrinkage

Very Low Low Medium High Very High

Tangential :

13.20%

Radial:

6.30%

Unit Movement Tangential:

0.36%

Unit Movement Radial:

0.23%

Strength Group

Very High

High

Reasonably High

Medium High

Medium

Reasonably Low

Low

Very Low

Unseasoned:

S1

S2

S3

S4

S5

S6

S7

Seasoned:

SD1

SD2

SD3

SD4

SD5

SD6

SD7

SD8

Stress Grade

Structural
No. 1
Structural
No. 2
Structural
No. 3
Structural
No. 4
Structural
No. 5

Unseasoned:

F14

F11

F8

F7

F5

Seasoned:

F22

F17

F14

F11

F8

Density per Standard

Seasoned:

820kg/m3

Unseasoned:

1155kg/m3

Joint Group

Very High

High

Reasonably High

Medium

Low

Very Low

Unseasoned:

J1

J2

J3

J4

J5

J6

Seasoned:

JD1

JD2

JD3

JD4

JD5

JD6

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:

68

Modulus of Rupture - Seasoned:

117

Modulus of Elasticity - Unseasoned:

11

Modulus of Elasticity - Seasoned:

14

Maximum Crushing Strength - Unseasoned:

35

Maximum Crushing Strength - Seasoned:

62

Impact - Unseasoned:

12

Impact - Seasoned:

12

Toughness - Unseasoned:

Medium - 15 - 24 Nm

Toughness - Seasoned:

Low - up to 15 Nm

Hardness - Unseasoned:

5.2

Hardness - Seasoned:

7.1

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

Lyctid Borer Susceptibility - Other:

Termite Resistance:

Not Resistant

Fire Properties

1 - non-combustible 2 - reasonably non-combustible 3 - slightly combustible 4 - combustible

Fire Properties Group
Number:

Group Number - Other:

3 if used on MDF or particleboard ≥12mm; veneer thickness 0.6-0.85mm

Average Specific Extinction Area:

<250

Bushfire Resistance:

BAL 12.5 and 19 - All AS 3959 Required Applications

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