Mortar Specialties

Cement Based Mortar

Monneli Neofil BLS


Neofil BLS can be mixed by hand or with any type of electrical mixer and is normally used to fill gaps between concrete and bricks.
Neofil BLS is particularly adapted for mounting regular / hollow blocks, stones and bricks on masonry structures prone to sulphate attacks from ground soil water or the construction units themselves.
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Technical Information
Product Description

Made of sulphatre resistant cement, graded sand and additives - a ready mix mortar that when blended together creates an improved workability, better-quality bonding and excellent water retention.

The use of sulphate resistant cement provides the mortar with enhanced durability and resistance when used in environments prone to chloride and sulphate attacks.


NEOFIL BLS reduces shrinkage and movement in masonry walls due to a controlled elasticity modulus.

  • Single component and requires only on site water addition
  • Excellent workability and ready to use
  • High strength and bonding properties
Packaging, Coverage / Consumption


Neofil BLS is supplied in 50 Kg bags

Shelf Life & Storage


Keep NEOFIL BLS in sheltered, off the gound, dry environment and well closed - original bags. 


Shelf life

12 months from production date if stored as recommended.

Technical Properties







1.7 kg/L


<0.1 g/L

Pot life at 25°C

60 minutes

Compressive strength at 28 days

12.0 N/mm2

Flexural strength at 28 days (BS EN 196)

3.0 N / mm2

Adhesion strength at 28 days (EN 1015-12:2000)

1.0 N/mm2

Application thickness

Up to 12 mm

Application temperature

+5°C and +42°C

Noxiousity according to EEC 88/379


All values are subject to 5-10 % tolerance

Application Information
Instructions for use

Surface preparation

The blockwork where NEOFIL BLS will be applied must be perfectly clean, solid, compact and free from grease substances or solid particles. It must not be over-heated nor frozen.

During hot water weather, the surface to recieve NEOFIL BLS should be brushed with water prior to application. Take extra note to neutralize the suction in the background to the blockwork by applying clean potable water. Allow excess water to be fully drained before applying NEOFIL BLS.


To prepare the mixture, pour in a container 6-7.5 liters of clean water. Add a bag of 50 Kg of NEOFIL BLS, then mix to get a homogeneous lump free consistency mixture using an electric agitator / slow speed mechanical mixer.

Once mixed, let the product rests for about 5 minutes and remix shortly before use.


Apply NEOFIL BLS using a trowel and then position the blocks verifying their alignment. Remove possible excess of mortar with a wet sponge before it hardens.


Protect the newly applied material from direct exposure to sunshine and wind and allow to be cured for at least 3 days by spraying with water 3 to 4 times daily.


Tools and equipment should be cleaned with water immediately after use. Hardened materials should be mechanically removed.


  • If the blocks are laid directly on the floor with possible humidity rising, it is recommended to apply a proper damp course system first.
  • The 2 cm separation between the top of the block wall and the bottom of slab or beam should be filled with suitable compressible material
  • Spray the block wall with water before applying the plaster
  • Ensure that the first layer of blocks is fixed properly with perfect alignment
  • Do not apply NEOFIL BL in rainy weather, high winds and sand storms
  • Do not apply on surface that has temperature less than +50C.
  • During summer season, working area should be covered to prevent the direct sun effects. Keep equipment cool and use a cool water.
  • The product should not be exposed to moving water during application.
Additional Information
Health & Safety

NEOFIL BLS is a cement - based product. Avoid contact with skin or eyes. Provide adequate ventilation in working place to avoid inhalation of dust.

During application, wear appropriate protective clothing, goggles, gloves and respiratory equipment of necessary.

In case of contact with skin, rinse with water and again wash thoroughly with soap and water. In case of contact with eyes, rinse with plenty of water and seek medical advice accordingly.

If ingested, obtain medical attention immediately. Do not induce vomiting.

Important note

The information in this Technical Data Sheet is based on Colmef Monneli’s experience. Colmef Monneli does not accept any liability arising from the use of its products as it has no direct or continuous control over where or how its products are applied. All Colmef Monneli’s Data Sheets are updates on regular basis. It is the user’s responsibility to obtain the latest version.

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