Woodworking industries, construction sites, and other workplaces that involve wood processing are susceptible to the hazards of wood dust. While wood is a versatile and widely used material, the fine particles generated during cutting, sanding, and other woodworking activities can pose serious health risks to workers.
Inhalation of wood dust can lead to respiratory issues, allergies, and even cancer in some cases. To ensure a safe and healthy work environment, it is crucial to identify, prevent, and control wood dust in the workplace.
In this blog, we will explore the importance of addressing wood dust hazards, as well as effective strategies for its identification, prevention, and control.
Wood Dust Definition
Wood dust refers to the fine particles and shavings that are generated when the wood is cut, sanded, drilled, or otherwise processed. It consists of tiny airborne particles that can vary in size, ranging from visible to the naked eye to particles that are so fine they can remain suspended in the air for extended periods. Wood dust is composed of cellulose fibres, resin, chemicals, and potentially harmful substances, depending on the type of wood being processed. Inhalation of wood dust can pose health risks to workers, including respiratory issues, allergies, and the potential for long-term health effects such as cancer.
Hard Wood
Hardwood dust refers to the fine particles and shavings generated during the cutting, sanding, or processing of hardwood species such as oak, beech, or mahogany.
Soft Wood
Softwood dust refers to the fine particles and shavings produced from cutting, sanding, or processing softwood species such as pine, cedar, or spruce.
Sources of Wood Dust
Wood dust and tiny wood particles are frequently produced during the production of wood goods. Sanding by hand or by machine, as well as machining operations (such as sawing, routeing, and turning), are common woodworking processes that generate dust.
The bagging of dust from local exhaust ventilation (LEV) systems, the use of compressed air to blast dust off objects, and the dry sweeping of manufacturing floors are other sources of breathable wood dust.
Manufactured wood products like MDF are made using formaldehyde. The boards’ unsealed surface may initially leak a small amount of formaldehyde gas; however, this rapidly goes away during first storage.
The only substantial airborne danger while cutting or sanding produced wood items, according to air monitoring data, is exposure to wood dust. Exposure to other airborne dangers, such as formaldehyde, is minimal so long as the wood dust is sufficiently managed using LEV.
Identification of Workplace Wood Dust Hazards:
Wood dust is a result of many woodworking techniques, including drilling, routeing, sanding, and sawing. It’s important to understand the many forms of wood dust created and their possible health impacts to handle the risks posed by wood dust in an efficient manner. Hardwood dust (such as oak, and birch) and softwood dust (such as pine, and cedar) are both common varieties of wood dust. These dust particles can be small and simple to breathe in, which puts employees’ respiratory health in danger.
Workplace Exposure Standard
There is a Workplace Exposure Limit (WEL) for both hardwood and softwood dust that must not be exceeded.
Based on an 8-hour time-weighted average, the WEL for hardwood dust is 1 mg/m3.
Based on an 8-hour time-weighted average, the WEL for softwood dust is 5 mg/m3.
The WEL for hardwood dust of 1 mg/m3 is applicable to all wood dust contained in combinations of hardwood and softwood dust.
Besides, A TWA of 0.5 mg/m3 is advised for exposure to all wood dust because of the qualitative evidence for asthma from other wood types, the likelihood of co-exposure to dust from multiple tree species in industrial contexts, and ambiguity in the database regarding a threshold for carcinogenicity.
Health Hazards Caused by Wood Dust Exposure
Exposure to dust from wood products has been linked to several reported health problems, including:
- skin conditions such as allergic dermatitis – some timbers are known to have negative health impacts and sensitisation
- throat discomfort, soreness, and watery eyes.
- asthma and decreased lung function.
- rhinitis (runny nose), severe sneezing, clogged nose, and nose bleeds.
People who have worked with hardwoods in extremely dusty woodworking workplaces with little to no dust management in place have also been known to get a rare kind of nasal cancer.
Managing Risks – Wood Dust Control and Prevention
Below given are the wood dust control and prevention techniques:
1) Alternative woods
Wood Suppliers and specialised timbers should offer details, such as a safety data sheet (SDS), on any possible negative effects on health from the wood being used. Employers should think about adopting less dangerous woods that have comparable strength or ornamental features.
2) Controlling the build-up of wood dust
Although it is impractical to eliminate wood dust from a woodworking setting, the health risk brought on by exposure to dust from wood products can be reduced by:
- Dust-free work procedures, such as using a plane instead of a sander
- Ensure that local exhaust ventilation is installed for all procedures that produce dust.
3) Local Exhaust Ventilation System (LEV)
LEV is the accepted industry process for industries. When assessing its performance and design, the following information may be helpful:
- Avoid using lengthy, fragile flexible ducting.
- Seal or cap any unused apertures or branches to optimise dust collection.
- Avoid using open ducts to try to catch the dust as it is created.
- Ensure to keep hard ducting straight and short. Do not make right-angle bends.
4) Monitoring Dust Levels
If you are uncertain about health risks, you may need personal air or dust monitoring to regularly assess the levels of exposure. National Exposure Standards have been determined for hardwoods and softwoods.
5) Preventative Maintenance
For the LEV system to function properly, the plant and equipment should be maintained in excellent condition.
Create a routine maintenance and repair schedule that includes:
- changing or emptying waste-collecting bags.
- checking for damage to ducting and dust collectors (also known as bag/sock filters).
- ducting and fan inspection for dust accumulation; fan inspection for unusual noise or vibration suggesting a problem.
- (yearly) overhaul of the LEV system by a qualified individual.
As part of the programme, records of inspections, repairs, and maintenance should be kept throughout the duration of the LEV.
6) Housekeeping
Simple changes to work practices can minimise the level of wood dust in the workplace, for example:
- Utilising techniques for the cleanup like damping down before sweeping or using an industrial vacuum cleaner fitted with a HEPA filter.
- Enforcing a “clean up as you go” policy.
- Avoid the use of compressed air to clear work benches or blow the dust off wood products except in inaccessible areas of the plant.
- Avoid the use of compressed air to remove dust from skin or clothing.
7) Providing Respiratory Protective Equipment
A respiratory protection device (RPD) suited for particles should be used when other dust management methods are impractical (it must be at least a Class P1 respirator). The Australian/New Zealand Standard AS/NZS 1715 offers detailed instructions on how to choose the right RPD. Verify that the apparatus complies with the necessary standards. On the respirator or its container, look for Australian Standard marks (see AS/NZS 1716) or an equivalent.
8) Other Safety Measures
- Obtain health and safety information from the wood supplier or manufacturer (the MSDS) and make it readily accessible.
- Inform employees of the dangers and risks of exposure to wood dust.
- Training workers on how to properly implement workplace safety measures.
- Monitor employees to verify the proper application of the chosen control measures.
- By keeping ignition sources like flame and sparks away from places where dust is being produced, you can lessen the likelihood of a dust explosion.
Regulations and Applicable Standards
In accordance with the Work Health and Safety Act of 2011, employers are responsible for ensuring that the working environment is risk-free for both employees and other people’s health.
1) Wood dust
Section 19 and Division 7 WHS Act
WHS Regulation Managing Risks from Airborne Contaminants
2) PPE
Section 19 WHS Act Clause 44 WHS Regulation
3) Standards Australia
AS 3640:2004, Workplace atmospheres – Method for sampling and gravimetric determination of inhalable dust
AS/NZS 1715, Selection, use and maintenance of respiratory protective devices.
AS/NZS 1716, Respiratory protective devices
For more information on Wood Dust Exposure control and prevention, talk to our expert Occupational Hygienists. You can call us at 1300 802 163 or e-mail – info@anitechgroup.com
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