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Coir

Description

General

This fruit fiber is contained in the husk of coconuts. Fiber length ranging from 10-30 cm. Coir fibers are ligth in weight, strong and elastic and have a low lightresistance and a high durability ( because of the fibre composition; 35-45% cellulose, 40-45 % lignine and 2.7-4% pectins and 0.15-0.25 % hemicelluloses). Several kinds of coir fibers can be distinguished, based on the type of raw material or kind of extraction method. Here, the distinction is made between white, green and brown coir fibers; White fiber is considered to be superior by colour and quality and gained by the most traditional extraction method: no machines are used, extraction by retting and handbeating. Green fibers are gained by mechanical fiber extraction and the quality of green fibers is slightly inferior to white fibers. The brown fiber is inferior of quality and also gained by mechanical extraction.
Coconut fiber

Properties

Chemical properties

Minimum value Maximum value Unit Sources
%
10 %

Electrical properties

Minimum value Maximum value Unit Sources
kV/mm
%
V
Ohm.mm²/m

Manufacturing Properties

Minimum value Maximum value Unit Sources

Mechanical properties

Minimum value Maximum value Unit Sources
MPa
MPa
MPa
1.15 1.33 kg/m³ Idemat 2003
15 17.3 % Idemat 2003
MPa
J/cm
MPa
140 150 MPa Idemat 2003
MPa
MPa
4000 5000 MPa Idemat 2003

Optical properties

Minimum value Maximum value Unit Sources

Thermal properties

Minimum value Maximum value Unit Sources
°C
°C
°C
J/kg.K
0.05 0.05 W/m.K Idemat 2003
e-6/K

Environment

mPt
Pt
mELU
MJ/MJ
MJ
kg
kg
Coir fiber is produced in India, Sri Lanka and Thailand. The coconut palm yields fruit about five years after planting, with full bearing in 10 years time, untill a palm age of 70 years. On average one palm produces 30 coconuts every year. Fibers are gained from coconut husks. Approximately 40-50% of a mature husk consists of fibers. Some pesticides and fertilisers are applied on coconut fields. Coconut palms cause no soil erosion. After harvesting, the retting process takes place for gaining white fibres. The nuts are retted in water pits for about 8 to 10 months. During retting the water is polluted with organic substances, which causes depletion.
Idemat 2003, Design for Sustainability, Delft University of Technology

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