The next step

National Poisons Information Service guidance on hydrofluoric acid burns

[Document]

The only current provider of online DCM training

[Weblink]

The HSE’s DCM information sheets which include recommended types of PPE

[Weblink]

Working safely with paint strippers and adhesives

Detailed advice

The guidance has been issued in separate information sheets covering: (1) general advice for managers; (2) brushing or spraying adhesives and paint strippers; and (3) stripping alloy wheels (see The next step ).

Dichloromethane (DCM) , which is also known as methylene chloride, is a highly volatile solvent, meaning that a small quantity will emit large amounts of vapour, even at room temperature. The vapour is colourless and has a mild odour so that workers may be unaware of the risk. But exposure to DCM can kill, especially in small spaces where the vapour can accumulate. DCM can cause headaches, lethargy, a lack of co-ordination, nausea, dermatitis, eye irritation and burns. In the longer term it’s suspected of causing cancer. Most concerning, at a high concentration, those affected may lose consciousness and die.

Reducing the risk

To comply with the Control of Substances Hazardous to Health Regulations 2002 you must select the least hazardous method of work, so far as is reasonably practicable.

Tip. That might mean detaching and transporting a component to a fixed tank for paint stripping, rather than doing the work in situ. Or you might prefer to replace the part completely.

Competency scheme

In the past, DCM paint strippers were readily available in DIY stores for use by all, but now they’re restricted. For those tradespersons using the products at transient workplaces, a Certificate of Competence is required.

Tip. Acquiring one is not as difficult as it might seem. There’s an online course costing £50, followed by an online multiple-choice assessment (see The next step ). Note. Certification is not required for work at a permanent workplace, or when using adhesive products. It’s only needed for DCM-containing paint stripper.

Preparing to work

It’s essential that when using any of these products good ventilation is achieved. Note. This may rule out use of the products in cellars, bathrooms, sheeted enclosures etc. because using them in a poorly ventilated space is highly dangerous.

Tip. If a work area is not naturally well ventilated consider how you can boost the frequency of air changes with mechanical ventilation equipment.

Tip. Using the correct PPE is especially important as DCM can penetrate through gloves and respirator filters very quickly. Without guidance, workers might assume it’s OK to use disposable gloves and a dust mask, therefore it’s important you obtain the right items and issue them with clear instructions (see The next step ).

Tip. DCM is often combined with other substances such as hydrofluoric acid (HFL) which may cause serious burns and eye damage. HFL burns need special treatment including the use of calcium gluconate gel. Ensure that workers have the correct information and first aid equipment to hand (see The next step ).

For links to the HSE’s DCM information sheets which include recommended types of PPE, to the only current provider of online DCM training and to National Poisons Information Service guidance on hydrofluoric acid burns, visit https://www.tips-and-advice.co.uk , Download Zone , year 20, issue 03.