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Benzene and you – normal unleaded pump fuel contains Benzene Strimmer_Aspen.jpg

Benzene exposure may result in cancer. A 2-stroke engine emits up to 25% of un-combusted hydrocarbons due to its design so this means that the users of small hand held machines will be exposed to a mist of all hydrocarbons contained in normal pump fuels when they use 2-stroke machines. Normal unleaded pump fuel contains up to 1% of benzene, and through the combustion of aromatics (typically 35% in unleaded pump fuels) up to an additional 2% of benzene is created. Aspen is free of benzene, aromatics, olefins and sulphur. This means that the risk of being exposed to dangerous substances is dramatically reduced. Normal unleaded pump fuel is classed as TOXIC whereas Aspen is classed as harmful. This means:

  • Unleaded pump fuel = TOXIC
  • Aspen alkylate petrol = harmful

Why expose yourself to toxic fumes and vapours when there is a clean alternative that reduces the hazardous hydrocarbon emissions by 99%?


Below is an extract from HSE Benzene and You:

Published by the Health and Safety Executive INDG329 10/04


Benzene can cause serious health problems. This information tells you about the health hazards of benzene and what to do if you are exposed to it at work.


Benzene is a highly flammable liquid which occurs naturally in crude oil, natural gas and in some groundwater's. It is also manufactured from crude oil and is present in crude oil vapours. The main use of benzene is as starting material for the manufacture of chemicals such as cyclohexane, ethyl benzene, phenol and maleic anhydride. It was formerly used as a solvent, but in most cases safer substances have now replaced this use. In the United Kingdom petrol contains below 1% benzene. Small amounts of it are produced when some organic substances burn incompletely, for example, it is found in cigarette smoke and vehicle exhausts. It is produced as a by-product during the manufacture of coke from coal. Benzene evaporates easily, and most people can just detect its distinctive smell at concentrations between 2.5 and 5 parts per million (ppm) in air. Benzene is not the same as benzine, a petroleum distillate which also comes from oil. However, as either spelling may be mistakenly used for the other, it is always wise to check.


You might be exposed to benzene at work during certain jobs in:

  • Oil refineries;
  • Chemical and petrochemical plants including some offshore installations;
  • Coke works; and
  • The storage, distribution and use of petrol or benzene

If you are in any doubt, ask your employer.



Benzene can be absorbed into your body:

  • If you breathe in air containing benzene vapour;
  • Through your skin; and
  • If you swallow material containing benzene.

The effects on your health depend on how much benzene you are exposed to, and for how long. Immediate effects of high exposure can include:

  • Headache;
  • Tiredness;
  • Nausea; and
  • Dizziness.

Unconsciousness may occur if exposure is very high. Long-term exposure to benzene can result in serious blood disorders such as anaemia and leukaemia (a form of cancer).



If you could be exposed to benzene at work, you should:

  • Ask your employer about the risks, what precautions to take and what to do in an emergency;
  • Follow the safe working procedures laid down by your employer;
  • Avoid breathing in vapours containing benzene;
  • Avoid getting liquids containing benzene on your skin;
  • Use the ventilation equipment and personal protective equipment provided, eg gloves, masks goggles. Gloves should be made from materials which resist penetration by benzene. Natural rubber gloves should not be worn as rubber absorbs benzene;
  • Report to your employer or safety representative any damaged or defective ventilation plant or protective equipment; and
  • Where required, attend any health checks arranged at your workplace.


Work with benzene is subject to the Control of Substances Hazardous to Health (COSHH) Regulations 2002.

Your employer is required to:

  • Assess the risks to your health and provide control measures to protect you;
  • Prevent your exposure to benzene, eg by eliminating its use or substituting a safer material, or if this is not reasonably practicable, to adequately control your exposure;
  • Reduce so far as is reasonably practicable the amount of benzene you breathe in, and in any case to keep it below the maximum exposure limit* of 1 ppm averaged over an 8-hour working day;
  • Establish the extent of exposure, normally by means of a monitoring programme;
  • Arrange any appropriate health checks;
  • Give you information on the risks of exposure to benzene, and train you in the use of any equipment, including personal protective equipment, used to control your exposure; and
  • Make sure that any control measures and personal protective equipment are kept in good working order.

* Maximum exposure limits are to be replaced by workplace exposure limits.

You are required to:

  • Co-operate with your employer;
  • Make full use of any control measures and report any defects in equipment; and
  • Attend health checks arranged by your employer.


The Approved Codes of Practice made under the COSHH Regulations contain further detailed information. Under the Reporting of Injuries, Diseases and Dangerous Occurrences Regulations 1995, your

employer is required to report to the Health and Safety Executive (HSE) if:

  • You suffer acute illness needing medical treatment;
  • There is an accidental release of benzene in a
  • Sufficient quantity to cause death or major injury;
  • A doctor confirms benzene poisoning.


Employers must consult safety representatives appointed by recognised trade unions under the Safety Representatives and Safety Committees Regulations 1977. Other employees not covered by such

representatives must be consulted either directly, or indirectly through elected representatives of employee safety, according to the Health and Safety (Consultation with Employees) Regulations 1996. Such consultations allow employees or their representatives to help employers develop control measures.



If you have any questions or worries that your health is being affected by exposure to benzene or that adequate precautions are not being taken, ask your supervisor, safety representative or union to discuss them with your employer, or discuss them with your doctor. If you need further advice, contact HSE’s Infoline Tel: 08701 545500 Fax: 02920 859260 e-mail: or write to HSE Information Services, Caerphilly Business Park, Caerphilly CF83 3GG. They may refer your enquiry to the appropriate HSE Inspector or Employment Medical Adviser, or to an Environmental Health Officer at your Local Authority.



Control of substances hazardous to health. The Control of Substances Hazardous to Health Regulations 2002. Approved Code of Practice and guidance L5 (Fourth edition) HSE Books 2002 ISBN 0 7176 2534 6 Occupational exposure limits: Containing the list of maximum exposure limits and occupational exposure standards for use with the Control of Substances Hazardous to Health Regulations 1999 Environmental Hygiene Guidance Note EH40 (revised annually) HSE Books 2002 ISBN 0 7176 2083 2 Occupational exposure limits: Supplement 2003 Environmental Hygiene Guidance Note EH40/2002 HSE Books 2003 ISBN 0 7176 2172 3 Working safely with solvents: A guide to safe working practices Leaflet INDG273 HSE Books 1998 (single copy free)



HSE priced and free publications are available by mail order from HSE Books, PO Box 1999, Sudbury, Suffolk CO10 2WA Tel: 01787 881165 Fax: 01787 313995 Website: (HSE priced publications are also available from bookshops and free leaflets can be downloaded from HSE’s website: © Crown copyright This publication may be freely reproduced, except for advertising, endorsement or commercial purposes. First published 10/97. Please acknowledge the source as HSE.


Published by the Health and Safety Executive INDG329 10/04

© 2017 Aspen Fuel