The business of charcoal making, which in the region makes use of wood from the abundant mangrove forests, has long ceased in Singapore. The last factory, on the evidence of a 1972 Straits Times article, was possibly on Pulau Tekong and it only is in some of our neighbouring countries that the production of what some may consider to be black gold can be found.
The charcoal factory at Kuala Sepetang.
One production centre that I had the opportunity to visit is the factory at Kuala Sepetang, located along the northern Perak coastline, just 15 kilometres from the charming old mining town of Taiping. The factory, operated by a Mr. Chuah Chow Aun, has a reputation for the best charcoal in Asia and does a thriving trade in meeting the demand from the large Japanese market.
Charcoal kilns, the contruction knowhow of which interestingly, was brought in by the Japanese during the war. The logs with barks stripped from them, are ready for the kilns.
The factory is well worth a visit just for the setting it finds itself in. Its long zinc roofed wooden sheds against which stacks of bakau wood logs are arranged, against the backdrop of the beautiful Matang mangrove forest on the banks of the Sungai Kapal Changkol, makes the scene it presents one that somehow looks like one that could well belong in a good old Western movie.
Another view of the factory. Logs are stripped of their barks in the area where they are unloaded from boats that bring them in from the nearby mangrove forest.
The sheds are where the main process of turning the wood is carried out. In them one finds rows of smoking kilns, in which the wood is heated and not, as is popularly believed, burnt, with the aim of removing water – which makes up the bulk of its weight when harvested, from the logs. It is a long, tedious and rather labour intensive process that is employed, which starts with the unloading of logs harvested primarily from 30 year old bakau minyak (Rhizophora apiculata) trees for which a sapling is planted for every tree that is harvested. The logs, which measure up to 5 inches in diameter, are prepared for the kilns by stripping their barks before they are stacked against the kilns before being moved in.
Logs of various diameters.
I was rather surprised to hear that it was in fact the Japanese that brought in the charcoal making techniques that are employed at Kuala Sepetang during the occupation. This process, involves the heating of the kilns – in which logs are positioned vertically on blocks of clay to keep them off the ground before the opening is reduced sufficiently in size to serve as a firing box, for a period of about 10 days. At this stage the temperature within the kilns is raised about 85° C. After this comes a second stage of heating for which the opening is reduced further, for another 12 days during which temperatures are raised to about 220° C. The kiln is left to cool for another week or so before the cured wood can be taken out.
A kiln opening, through which logs are moved into the kiln.
An example of how logs are vertically arranged and the clay blocks on which they are made to stand on.
The first stage during with a larger opening is maintained at the firing box.
Experience plays an important part in the process and is monitored only through observation of the vapour that billows out of an opening in the kiln. From 1500 logs or about 40 to 50 tonnes of wood that is placed in the kilns before the start of firing, only 10 tonnes of is left as charcoal – the rest of the weight having been expelled as vapour. The vapour however does not go to waste and is in its condensed form, sold as mangrove wood vinegar, which is said to repel mosquitoes and cure common skin problems.
The opening is reduced during the second stage.
A kiln in use.
The factory, Khay Hor Holdings Sdn. Bhd. or more commonly referred to as the Kuala Sepetang Charcoal Factory, is open for visits. Arrangements can be made for guided tours by contacting Mr. Chuah at +60 12 5739563. More information is available at the Kuala Sepetang Charcoal Factory Facebook Page and at this link: The Charcoal Factory.
Vapour coming out of a kiln – the vapour, which is used to monitor the process , is collected and sold in its condense form as mangrove wood vinegar.
The entrance to the factory.
The Long and Winding Road 