Nero Grey (Oscuro) 4-6mm 25kg

Product Code

25kg bag of Nero Grey (Oscuro) 4-6mm, washed and dried marble aggregate. 

£8.40 £10.08

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Before application of an Asphalt / Tarmac base, concrete or cellular grid, there should be in place the correct sub-base. This would be a minimum 150mm depth of well compacted Type 3 granular sub-base to SHW clause 805, or 4/40mm, 4/20mm crushed aggregate to BS EN12620 or locally available secondary or recycled aggregates which comply with the above specification blinded with 2/6.3mm graded crushed concrete aggregate to BS EN12620.

1. Concrete bay proportions should be ideally 1:1 and should not be greater than 3:2, long narrow strips of concrete will crack across the bay width and these cracks are likely to be mirrored in the surfacing. 
2. Open bay joints are likely to cause cracking in the surfacing and formation should be prevented by application of Polycrete repair mortar into the joints. Bays should be linked with steel mesh reinforcement, or if already in place, a surface grade mesh should be embedded in the surface using an epoxy bedding coat. 
3. Ensure that the concrete has a minimum design strength of C35 and that the concrete has a minimum compressive strength of 25N/mm2 before the surface is prepared, in accordance with BS 8500-2:2015. 

Ensure that falls are in place to an adequate drainage system when applying to an impermeable concrete base. Water will flow through the Valtex system and run across the concrete surface.

Asphalt (Bituminous Macadam):
The bitumen binder of asphalt concrete must have a pen value no greater than 100/150, when tested in accordance with EN 1426 Needle Penetration Test. It is advisable to use a harder grade of bitumen when machine application is possible and 70/100 pen (or harder) is preferred.

Bituminous materials with a higher pen value will be too soft and may deform in warm weather. Adequate compaction of the sub-base and base is essential to prevent cracking. A minimum 1 tonne “sit on” roller should be used when possible and the contractor must ensure that the construction is fully restrained at all edges to ensure dimensional stability.

Rainwater will flow through the permeable Valtex Resin Bound System, and through the open grade binder course. An integral drainage system is not required.

Cellular Grid:
We would recommend to use a cellular grid of 40-50mm in depth. The grid should be set on to a well compacted sub-base as laid out above. The cellular grid should then be filled with well compacted 4/10mm graded crushed aggregate to BS EN12620. The in-fill aggregate must be compacted to ensure the profile of the cellular grid is still visible, and capable of bonding to the resin bound system. 

Failure to compact the stones within the grid correctly will result in a slump of the resin bound material through the grid, causing delamination. 

Perimeter Edging:
Protect all edges abutting soft landscaping with brick, steel, timber or concrete to prevent damage to the surfacing. Edgings should be securely fixed to prevent movement. A flexible joint filler should be used at edgings where there is potential for movement to separate the surfacing from the edging.

Concrete Preparation:
Prepare concrete by mechanical means to provide a sound, clean, dry substrate that is free from laitance and suitable for application of the resin bound surfacing. Concrete should be primed prior to application using our Easiprime or Epiprime (and seeded with a 1.4 - 1.8mm quartz).

Asphalt (Bituminous Macadam) Preparation:
Allow the asphalt to oxidise for 7 days prior to application of the Valtex Resin Bound Surface. It is not a requirement to prime asphalt surfaces.

1. Scrape all of the contents of the Hardener B component into the larger Resin A component container and mix with a slow speed drill (≤ 450RPM) and MR2 paddle mixer attachment for 60-90 seconds. Overmixing will increase heat generation and reduce working time.
2. Slowly add the 26.56kg Aggregate Kit whilst mixing, and mix for approximately 2 minutes until the resin has fully encapsulated the stone. 

Valtex resin bound binder is available with a 10 Year Warranty as standard. Warranties up to 21 years can be made available subject to installation by an Approved Contractor, and further project details being provided and approved prior to installation. The life expectancy of these systems is 20-25 years. 

Type of Use:

This resin bound binder used with a suitable aggregate kit is suitable for both pedestrian and vehicle traffic. Ensure this product is applied on to a suitable base, and is not subject to misuse (see Product Limitations below). 

Warranty Details:
Please complete our Project Warranty Application, and a project specific Warranty Document will be created. Please note a warranty document must be provided for a warranty to be in place. All warranties are subject to correct installation in accordance with our instructions, and application on to a suitable base.

Product Limitations:
1. The minimum application temperature is typically 5°C (8°C when used without Accelerator) on a rising thermometer and maximum is typically 25°C. Ideal temperature conditions are 15 – 20°C.
2. The surfacing may be affected by the shaling action of tyres when vehicles are turning in confined spaces, and should be avoided.
3. Tyres must not be turned when in a static position.
4. Debris and loose stones must not be trafficked on to the resin bound surface, as this may result in loosening of existing stone.
5. Regular inspections should be carried out to ensure early detection of damage should this occur.

Delivery is £4.99 + VAT for mainland UK.


More Information
Alternative Names Gris Oscuro (On the Bag), Manhattan (Part of this Blend)
Size 25kg
Slip Resistance Value Dependent upon Aggregate Kit
Los Angeles Coefficient LA 30
Stone Hardness 5 Mohs
PSV (Polished Stone Value) 35-40
AAV (Aggregate Abrasion Value) 2
AIV (Aggregate Impact Value) 18
Mixed Resin : Aggregate Ratio 1.88kg Mixed Resin : 26.56kg Aggregate / 7.08% Mixed Resin to Aggregate Only
Resin A : Isocyanate B Ratio 120% Resin A : 100% Isocyanate B
UV Resistance / Stability UV Resistant
Elongation at Break (%) 70%
Hardness (Shore D) 65 Shore D
Tensile Strength (MPa) 13 MPa
Gasoline/ Diesel Resistance No Change
Minimum Application Temp 5oC
Maximum Application Temp 25oC
Suitable Substrates Recommended - Open Grade Tarmac / Asphalt. Concrete, Cellular Grid and others also suitable. Contact us for more info.
Recommended Thickness 18mm
Curing Schedule Guide Assumed 20oC. Pot Life: 30 Mins Tack Free: 12-16 Hours Vehicle: 1 Day. Lower temperatures will retard the curing time.
Suitable Resin Binder Valtex Resin Binder 7.5kg
Brand Vuba
Coverage Rate Guidance 3.5m2 per Aggregate Blend @ 18mm Depth
Aggregate Type Marble
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