Harena is an award-winning, fine grade, patent coated mineral with a granular size of
approximately 0.8mm, capable of bonding all forms of hydrocarbon including fuels, oils and
modified synthetics.


The fine grade of Harena gives the adsorbent a very large surface area which aids the bonding process of hydrocarbons and ensuring a quick and efficient capture of contamination.

Harena has failsafe features which make it a suitable choice for a wide range uses from spillage control to hydrophobic sealing. These are as follows;

  1. Effective on all forms of hydrocarbon – from low viscosity silicon oils to high viscosity bitumen and crudes.
  2. Full hydrocarbon capture – Harena is able to successfully bond hydrocarbons whether in free phase, emulsified or vapour form.
  3. Non-leaching capability – Harena mechanically bonds the hydrocarbon molecule to itself preventing leaching either at the spill source or later at disposal.
  4. Fully hydrophobic – Harena will actively repel water meaning only the hydrocarbon contaminates will be removed, thereby reducing disposal cost
  5. Fire retardant – Harena is able to capture the vapour element of high volatile fuels which significantly reduces the risk of combustion.
  6. Heavyweight – Designing as a weighty product means Harena can be applied to exactly where it is required and needed.
  7. Heavyweight – Designing as a weighty product means Harena can be applied to exactly where it is required and needed.
  8. Indefinite shelf life – Harena is not degraded by moisture or wet environmental conditions.
  9. Disposal methods – Harena has been WAC tested and classified as environment friendly non-reactive waste BS EN 12457

Harena is available in a number of formats

20kg long lasting woven polypropylene valve sacks

Palletised 20kg x 50 polypropylene valve sacks

6kg Harena refillable applicator

1000kg Bulk bag format (only available for bulk order quantities)

Harena – Heavyweight granular

Harena – Heavyweight granular

Adsorption (bonding) rates

A kilo of Harena will bond approximately 0.4litres of pure hydrocarbon dependant on viscosity.

A 20kilo bag of Harena will bond approximately 8litres of pure hydrocarbon dependant on viscosity

A 6kilo Harena applicator will bond approximately 2.4litres of pure hydrocarbon dependant on viscosity.

Harena applications

Contamination prevention and bunds

Harena is utilised proactively as a method for preventing ground contamination. Harena can be used as failsafe bund for a number of scenarios when it is critical to prevent contaminating hydrocarbons from gaining access to surrounding environments, such as water courses and tables.

The simple column test below highlights the benefits of utilising Harena to prevent contamination progressing through to a calcium carbonate sub layer such as is typically found in the South-East of England.

In the before and after trial photos below we have used ordinary fine grade sand as a mean to highlight the difference achieved. We added 500ml of dark, viscous garage waste oil into a 150mm diameter column and monitored for a 24hr period.

Harena is a versatile product with a number of applications. Some of these applications are detailed below.

Harena – Heavyweight granular

Harena – Heavyweight granular

(NB: Harena is the darker media on the right)

The Harena in the right hand column has fully captured the garage waste oil and prevented it from migrating through to the calcium carbonate. The left column highlights what would have happened without the Harena bund failsafe in place.

The photo’s below show the same benefit when used as a protective bund around pipe-work or cabling. Contaminating garage waste oil migrates along a length of Harena, rather than migrating immediately through the calcium carbonate. This feature creates a failsafe where regular pipe-work monitoring is difficult. In addition, a Harena pipe-work and cabling bund will aid protection from flints, stones and other sharp objects found in the ground.

Spill control

The wide-ranging features of Harena make it the perfect solution for spillage control. Harena will bond from a variety of ground surfaces including semi-porous surfaces such as concrete and asphalt, providing a complete clean without residue or staining. (See photos below)

Harena is effective at bonding all hydrocarbon based liquid compounds and be utilised on both thick viscosity heavy oils such as bitumen and crude, and light ultra thin viscosity oils such as silicone oils and fuels.

Harena is a fast response adsorption media capable of removing spillage quickly and effectively, thereby reducing the impact of contamination on the surrounding environment as quickly as possible.

Dealing with high volatile hydrocarbons

When used to clean up volatile hydrocarbons, such as petrol and diesel. Harena is able to add some significant safety factors.

Harena is able of bonding both the liquid and vapour elements of the hydrocarbon molecule, thereby creating a significantly reduced spark and fire risk than with conventional absorbent options. This unique feature means, Harena is able to improve health and safety for a number of spill response uses. These scenarios include road traffic collisions and fuel forecourt spillage clean up among others.

The image below highlights the difference between Harena (left) and sand when are used to clean up a petrol spill. (100ml petrol was used for this test)

Harena – Heavyweight granular

This image highlights the ability of Harena to completely prevent the ignition of the bonded petrol creating a safe environment. Use of sand or standard absorbent materials to absorb volatile hydrocarbons will not prevent a potential combustible situation.

The fast bonding action and ability to prevent secondary fire risk, make the Harena adsorbent the most effect granular spill control product where risk control and health and safety controls are of paramount importance. These include road traffic collisions, firewater runoff containment and fuel containment facilities and storage systems.

Wet Environments

Harena is equally able to benefit when contaminating hydrocarbons are found in wet surfaces and environments.

Harena is able to remain fully hydrophobic whilst purely bonding the contaminating hydrocarbon. Bonded contaminate will remain non-leaching even whilst submerged in water. (see below)

Ground Remediation

Harena can provide benefit to ground remediation where hydrocarbon contamination is a factor. Removing fuels and oils trapped within sediments is often time consuming and costly to remediate, especially when sediments require off site treatment.

Harena can be mixed within these contaminated sediments to capture and isolate the contamination from the surrounding environment. Due to the non-leaching feature of Harena, these captured hydrocarbons can be safely remediated on site without the need for off-site treatment. Captured hydrocarbons will break down naturally over time although additional bacteria can be added to quicken the process further.

Harena Logo

(Images from a Kier project, St Mary’s Island, Scilly Isles)

Hydrophobic Sealing

The fine density and hydrophobic capability of Harena mean it can add significant benefit when utilised as part of a watertight seal. Harena is capable of preventing water penetration and can be used for a variety of capping or sealant layer scenarios.

Harena is unaffected by regularly changing environmental conditions, giving it the resilience required to create caps and seals with robust longevity.



Used products have been Waste Acceptance Criteria (WAC) tested and classified as non-reactive due to its non-leaching feature. When disposing used product in a landfill environment, it would be a requirement to carry out further testing on any used product to be disposed of in landfill, in order to achieve non-reactive disposal approval. Ordinarily, used product is disposed of as Hazardous waste.


Unused Harena is a naturally derived and inert product. Used product containing hydrocarbon will have a high calorific value. This makes it suitable for disposal by incineration for energy production. Incineration must be carried out at an approved facility.


Due to the non-leaching feature of the product, it is potentially possible to remediate by composting. The addition of appropriate heat and bacteria will allow for breakdown of the contained hydrocarbon by bacterial method over time. Used product must be composted in an isolated environment.


Bonded hydrocarbon has the potential to be recycled, although untested at this stage. A robust enough scrubber may remove/break the product coating, allowing the release of contained hydrocarbons back into the environment.