Taun | Pometia Pinnata

Taun comprises several hardwood species occurring in various parts of South-East Asia and the Pacific. Taun lends itself to general building construction and decorative uses.

Other Names: Malugai (Philippines), Kasai, Sibu (Sarawak, Sabah), Truong (Vietnam), Aia Fai, Mala, Ula, Ako Dawa (Solomon Islands), Tava (Western Samoa), Ahabu, Matoa (Papua New Guinea), Malugay, Akwa, Pometia Tomentose, Pometia Tomentosa, Pometia spp.

Overview

Taun comprises several members of the Pometia species occurring in low-lying coastal and riverine areas of Sri Lanka and South-East Asia, Papua New Guinea, the Solomon Islands and Samoa. Although the species can attain heights of up to 25 metres, an irregular bole and elliptical cross-section results in relatively short log lengths.

Taun heartwood varies in colour from pink to reddish-brown, darkening with age. Sapwood is a pale, pinkish buff, not always visually distinct from the true wood. The grain of taun timber is straight, with occasional interlocking, and of moderately coarse texture.    

Taun is a moderately durable hardwood, with an above ground life expectancy of between 15 and 40 years. Its in-ground life expectancy is considerably shorter, at between five and 15 years. Taun sapwood is susceptible to lyctid borer attack and is very difficult to impregnate with preservative. Taun is not termite-resistant.

Uses of taun in construction include general house framing, cladding, fascia boards, internal flooring, and plywood. Taun's properties also lend themselves to decorative applications such as lining, paneling, joinery, cabinetwork, outdoor furniture, carving, turnery and veneers. It is also used for boat building and cooperage.

Properties

Shrinkage

Very Low Low Medium High Very High
Tangential:          
5.5
Radial: 3 - 4

Strength Group

Very High High Reasonably High Medium High Medium Reasonably Low Low Very Low
Unseasoned:S1S2S3S4S5S6S7
Seasoned:SD1SD2SD3SD4SD5SD6SD7SD8

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

Unseasoned: 0 kg/m3
Seasoned: 700 kg/m3

Joint Group

Very High High Reasonably High Medium Low Very Low
Unseasoned:J1J2J3J4J5J6
Seasoned:JD1JD2JD3JD4JD5JD6

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: 67
Modulus of Rupture - Seasoned: 106
Modulus of Elasticity - Unseasoned: 11
Modulus of Elasticity - Seasoned: 14
Maximum Crushing Strength - Unseasoned: 31
Maximum Crushing Strength - Seasoned: 60
Impact - Unseasoned: 14
Impact - Seasoned: 14
Hardness - Unseasoned: 4.2
Hardness - Seasoned: 6.5

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: Not 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:
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 – Door and window joinery only

Description

Botanical Name: Pometia Pinnata
Preferred Common Name: Taun
Other Names: Malugai (Philippines), Kasai, Sibu (Sarawak, Sabah), Truong (Vietnam), Aia Fai, Mala, Ula, Ako Dawa (Solomon Islands), Tava (Western Samoa), Ahabu, Matoa (Papua New Guinea), Malugay, Akwa, Pometia Tomentose, Pometia Tomentosa, Pometia spp.
Species Type: Hardwood

Appearance

Taun heartwood varies in colour from pink to red-brown, darkening with age. Sapwood is a pale, pinkish buff, and not always visually distinct from the true wood. The grain of this timber is straight, occasionally interlocked and of moderately coarse texture.  

Common Applications

Uses of taun in construction include general house framing, cladding, fascia boards, internal flooring, and plywood. Taun's properties lend themselves to decorative applications such as lining, paneling, joinery, cabinetwork, outdoor furniture, carving, turnery and veneers. It is also used for boat building and cooperage.

Common Form

Sawn

Workability

Taun is moderately hard (rated 3 on a 6-class scale) in relation to indentation and ease of working with hand tools. The timber saws and turns easily with only a moderate blunting effect on cutting edges. It is readily bored and holds nails and screws well, can be satisfactorily bonded using standard gluing procedures, takes paints and stains well, and can be polished to a smooth, high finish. While taun is reasonably easy to work, sanding dust may be an irritant to mucous membranes.

Origin of Timber

Asia, SE Asia, Oceania

Origin of Timber - Other

SE Asia, New Guinea, Philippines, Solomon Islands, Sabah, Samoa, Sri Lanka, Andaman Islands, Tonga, Niue

Readily Available

NSW, VIC, SA, TAS, QLD, WA

Availability - Further Information

Small quantities of taun are imported into Australia.

Source of Timber

Plantation

Applications

  • External Cladding

    The natural appeal, versatility and strength of timber makes it the superior choice for external cladding. Through specification, planning, design and finishing processes, timber cladding not only creates a building of superior strength, acoustic and thermal performance but also creates a place of beauty, style and natural appeal.

  • Flooring

    Whether for structural or finished flooring applications, timber offers durability, versatility and adaptability. The warmth, strength and natural beauty of timber flooring has proved enduringly popular in a wide variety of interior settings.

  • Internal Paneling

    Timber paneling creates interiors as warm as they are stylish. Commonly using an MDF or plywood substrate, internal timber paneling is natural and versatile and comes as either solid natural timber panels or as sheets of engineered wood products

  • Timber Joinery Products

    Timber joinery products offer a classic, unique and stylish touch to any interior design.

  • Timber Portal Frames

    For buildings that require large spans and column free interiors, timber portal frames provide one of the most aesthetically pleasing solutions. Utilising modern engineering technology, portal frame design transforms timber into a highly effective, efficient and economical structural product. This application guide provides a comprehensive overview of the process of using timber in the specification, fabrication and erection of portal frame structures.

Case Studies

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