Most abrasive blasting processes create a problem for the people running them. Airborne particles. Noise. Vibration. The process you choose determines how serious those problems are, and how hard they are to manage.
Wet blasting has a fundamentally better safety profile than dry blasting. It is the reason wet blasting was invented. Norman Ashworth developed the process in the late 1940s because dry blasting was too hazardous for precision jet engine work. The founding logic has not changed.
That advantage is demonstrable across three areas every production manager and EHS lead needs to assess.
Dust and airborne hazards: dry blasting creates them, wet blasting suppresses them
In dry blasting, the abrasive jet is propelled through air. Everything it dislodges, paint particles, surface oxides, substrate debris, becomes airborne. Where coatings contain cadmium or chromium compounds, classified as Group 1 carcinogens by the International Agency for Research on Cancer, that dust is not a nuisance. It is a lung cancer risk.
The HSE estimates around 12,000 deaths per year in the UK are linked to past occupational exposure to dust and chemicals at work (HSE work-related ill health statistics).
In wet blasting, abrasive is delivered in a water slurry. Particles removed from the component surface are captured in the water phase, not ejected into the air. Dust suppression is not an add-on or a mitigation. It is built into the mechanism of the process. The obligation to conduct a COSHH assessment covering the materials being processed remains regardless of process type. What changes is the starting risk level, and it changes significantly.
Noise: a hazard most blasting equipment suppliers would rather not measure
The Control of Noise at Work Regulations 2005 sets a lower exposure action value of 80 dB(A). The A(8) in that figure means the sound level, adjusted to reflect how human hearing actually perceives it, averaged across an eight-hour working day. Exceed 80 dB(A) and employers must make hearing protection available. Exceed 85 dB(A) and hearing protection becomes mandatory.
Vapormatt machines typically operate at 75 dB(A), below the threshold at which protection programmes are triggered. We publish that figure because we are confident in it.
Most blasting machine suppliers do not publish noise data at all. When a supplier cannot tell you how loud their machine is, it is worth asking why.
Noise-induced hearing loss is permanent. It is also entirely preventable when the right engineering decisions are made at the design stage, which is precisely where triple insulation, neoprene lining, and triple-glazed cabinet glass make their contribution.
Vibration: where most operators have an unmanaged risk
The Control of Vibration at Work Regulations 2005 sets a daily exposure action value of 2.5 m/s² A(8), which means the vibration level transmitted to an operator's hands, measured and averaged across an eight-hour working day.
Exceed it without controls in place and you are in breach. The HSE estimates nearly 2 million people in the UK are currently at risk of hand-arm vibration syndrome (HAVS), a permanent and irreversible condition with no cure (HSE hand-arm vibration guidance).
In manual wet blasting, the vibration risk is widely misunderstood. The primary source is not the gun. It is the component being blasted. When an operator holds a part by hand while blasting it, vibration transmits directly from the component into the hand. Most risk assessments focus on the gun and miss this entirely.
This is not a hypothetical risk. In 2013, the HSE prosecuted Rolls-Royce after a worker developed permanent bilateral carpal tunnel syndrome from holding turbine blades during wet blasting for up to nine hours a day. Rolls-Royce was fined £60,000 and ordered to pay £18,168 in costs. The solution they implemented was automated wet blasting equipment.
Some manual blasting cabinets on the market are sold with gun-holding brackets, freeing the operator's hand to hold the component instead. That configuration does not reduce vibration exposure. It redirects it to the most dangerous source.
Download our HAVS white paper for the full technical detail
How Vapormatt machines are built: safety beyond the minimum
Compliance with the minimum requirements of the machinery directives is the floor, not the ceiling, with some non-EU manufacturers falling below this floor too. Our machines are designed above it, because the consequences of getting it wrong are permanent.
Every design decision below reflects a deliberate choice to go further than regulations require.
Dual-channel safety switches on manual machines
Standard safety circuits use a single channel. Our manual machines use dual-channel switching, building in redundancy that goes beyond the minimum directive requirements. If one channel fails, the second holds. Operators are protected even if a component fails.
Premium hardware
Every Vapormatt machine is built with control and operator safety systems using hardware that carries the highest industry approvals available, often certified to standards above those the directives mandate. We do not specify components that merely pass. We specify components that lead.
Operating position relative to loading positions
Where the control panel sits relative to where an operator loads and unloads a machine matters. Positioning the HMI so that an operator cannot activate the machine whilst in an unsafe position is a design choice. It is not mandated. We make it on every machine.
Insulated, automatic machines
Our automatic cabinets walls are insulated as standard, contributing to the 75 dB(A) operating level we publish. The engineering that produces a quieter machine reflects the same commitment to operator environment that runs through every other design decision on this page.
Safety glass
All of our automated cabinet windows are made of safety glass and cannot shatter or splinter under impact. This protects operators from fragment risk during processing and further reduces noise transmission from the cabinet interior.
Easy-pull pump removal with assisted lift
Pumps are designed for single-person removal without draining the sump, using an assisted lift mechanism. Maintenance tasks that on other machines require two people, or create manual handling risks, are handled safely by one.
Filtration tanks and buckets designed to safe working weights
Filtration tanks are set at a safe working height. Waste collection buckets are sized so that a fully loaded bucket remains within standard manual handling limits for a single operator. The weight a person is expected to lift is specified at the design stage, not left to chance.
These are not features that appear in a specification table. They are the difference between a machine that is compliant and a machine that is safe.
FAQs
What health and safety regulations typically apply to wet blasting operations?
Wet blasting operations are subject to occupational health and safety legislation in most jurisdictions, covering several key risk areas. Employers are generally required to assess and control exposure to hazardous substances generated during blasting, manage noise and vibration levels to protect workers from permanent injury, and ensure that equipment is properly maintained and safe to operate. In the United States, OSHA sets enforceable standards covering abrasive blasting operations. In the European Union, equivalent protections are provided through a series of workplace health and safety directives. Regardless of location, employers should identify the specific regulations that apply to their operations and ensure their processes, equipment, and training programmes meet or exceed those requirements.
Does wet blasting require a COSHH assessment?
Yes. Even though wet blasting suppresses airborne dust, a COSHH (Control of Substances Hazardous to Health) assessment is still a legal requirement. The assessment must cover the abrasive media being used, any coatings or contaminants being removed from components (such as chromium or cadmium compounds), and the wastewater and slurry produced by the process. The wet phase captures hazardous particles rather than releasing them into the air, but those particles must still be managed, stored, and disposed of safely and in accordance with environmental regulations.
Is wet blasting safe to use with components that have previously been coated with hazardous materials such as lead paint or chromate primers?
Wet blasting can be used on components with hazardous coatings, but it requires careful risk management. Because the process captures removed particles in the water slurry rather than releasing them as airborne dust, it is generally considered a lower-risk method for stripping hazardous coatings than dry blasting. However, employers must carry out a thorough COSHH assessment before processing such components, ensure the resulting slurry and wastewater are treated as hazardous waste, and confirm that their filtration and waste handling systems are appropriate for the specific contaminants involved. Operators should be informed of the hazards present and provided with suitable PPE.
What training should wet blasting operators receive before using blasting equipment?
Operators should receive documented training that covers safe machine operation, correct loading and unloading procedures, how to hold components to minimise hand-arm vibration exposure, emergency stop procedures, PPE requirements, and what to do in the event of a slurry leak or equipment fault. Refresher training should be provided periodically and whenever processes or equipment change. Employers have a duty under the Health and Safety at Work Act 1974 to ensure workers are competent and properly trained for the tasks they perform.
How often should wet blasting equipment be inspected and maintained to remain compliant?
Regular inspection and preventive maintenance are essential both for operator safety and regulatory compliance. Employers should follow the manufacturer's recommended maintenance schedule, carry out routine checks on safety interlocks, door seals, and filtration systems, and keep written records of all inspections and servicing. Under PUWER (Provision and Use of Work Equipment Regulations 1998), work equipment must be maintained in good repair and inspected at suitable intervals. Any faults affecting safety systems should be reported and rectified before the machine is returned to use.
Does wet blasting equipment require chemical treatment to prevent Legionella?
Yes. Wet blasting systems recirculate warm water containing swarf, rust, and organic debris - conditions in which Legionella bacteria can multiply rapidly. A biocide treatment programme, regular sump cleaning, and a documented Legionella risk assessment are all required under the HSE's Approved Code of Practice L8. If your current process does not include these controls, it is not compliant.