ALLERGY MASKS: ACTIVATED CARBON MASKS
Activated carbon masks come in various designs but all combine a fibre layer or web which will trap particles, and activated charcoal which absorbs a wide range of gases and vapours. They are designed to fit well around the nose, mouth and cheekbones to seal the areas where air can enter. They will protect against both small particles and chemical vapours.
3M make one which is made of a dense synthetic fibre web which traps particles effectively, and activated charcoal filter media within the fibre web. It is one of the most effective, and light and relatively comfortable to wear. It will not protect 100 per cent against chemicals and particles, and if you are extremely sensitive to synthetic fibres, you may react to the fibres of the mask, but reactions of this kind are rare and most people find it useful. The mask will need replacing every six months, or more often if you use it intensively. The 3M mask costs around £5-6 at 1992 prices and is available by post from Allerayde or The British Lung Foundation. A similar mask by Pirelli is available from Safety Equipment Centre.
One solution, if you react to contact with the materials of a face mask, is to line the inside of the mask with a pure cotton handkerchief or cotton muslin nappy, or with a silk scarf if you are sensitive to cotton. This helps protect skin in contact.
More expensive versions of charcoal filter masks are made by Respro. One version, the Respro Bandit (£10-12), is a 100 per cent cotton scarf with a nose clip, which incorporates a charcoal filter, laminated into the scarf. It is chemically treated to be fully washable; if you are exceptionally sensitive, you may react to the treatment. Wash it before use to try and avoid problems. The scarf looks more attractive than a nose and face mask, however, and may be more comfortable.
Respro also make the City Pollution Mask at £20 with a replaceable charcoal filter, which has a stretchable fitting to fit comfortably around the face. This fitting is made of neoprene, with a lycra lining, which again may upset you if you are exceptionally sensitive to synthetic rubber and elastomers.
Both Respro products are available from The Green Catalogue and Renaissance Design.
*345\117\8*
Related Posts:
April 2, 2009 - 6:02 AM