!FREE DELIVERY on Every Order (Most of Mainland UK) *

Bostik Cempolatex Fibreflex 25Kg – Pallet Deals and Bulk Buy – Highly Flexible Self Levelling Compound

Bostik Adhesives and Levellers - Terrific Pallet Deals and Bulk Buy

Bostik Cempolatex Fibreflex

Highly flexible smoothing compound

Bostik Cempolatex Fibreflex is a one part, rapid setting, self levelling compound developed for use on subfloors where vibration and minimal thermal movement can be problematic.

Reinforced with fibre, it is protein and casein free and can be used over most common subfloors, including mechanically fixed flooring grade plywood (SP101) and P5 chipboard.

Fibreflex can be applied between 3-30mm thickness in a single application and is suitable for use with most common electrical under floor heating mat systems.

  • Rapid setting
  • Fibre reinforced and highly flexible
  • Can be used over most common subfloors
  • Can be used over mechanically fixed flooring grade plywood (SP101) and P5 chipboard
  • Protein and casein free
  • Suitable for use with most common electrical under floor heating mat systems

Bostik Cempolatex Fibreflex extended information

Coverage: Approx. 5m2 per bag at 3mm depth

(depending on the smoothness of the floor surface & application technique)

Bostik Cempolatex Fibreflex is a protein-free, flexible smoothing compound, reinforced with fibres. It has excellent workability and flow characteristics and can be trowelled to depths between 3mm and 30mm in a single application.

For smoothing and levelling sound, strong substrates where minimal vibration or lateral movement occurs. It can be laid over most common substrates including: concrete subfloors, sand/cement screeds, stone, anhydrite screeds, rigid metal, terrazzo & quarry tiles, asphalt and other strong, rigid subfloors.

It may also be used over sound, firmly bonded timber flooring such as 12mm flooring grade SP101 plywood and P5 chipboard, provided the timber is mechanically fixed. Fibreflex must not be used over adhesive or water-soluble residues.

As Bostik Cempolatex Fibreflex is totally protein-free, it is suitable for use in biologically sensitive areas. The low-odour formulation makes Bostik Cempolatex Fibreflex ideal for use in occupied buildings.

It is suitable for use with warm water underfloor heating systems and for encapsulating electrical radiant heating mats, provided a surface temperature of +27°C is not exceeded. It is not to be used as a wearing surface and should always be covered with a floor covering. For interior use only.

Bostik Cempolatex Fibreflex product characteristics

FormDry, free flowing powder
Specific Gravity1.4 approx
CompositionBlend of cements and fibres
Product Codes30606658 25kg bag
Storage/Shelf LifeStore and transport securely. Store
for up to 6 months from date of
manufacture in original, unopened
packaging, clear of the ground, in cool,
dry conditions within the
temperature range +5°C to +25°C and
out of direct sunlight. Protect from
excessive drafts, frost, damp,
condensation and dew.

Bostik Cempolatex Fibreflex typical performance data

+5°C to +25°C
CoverageApprox. 5m2 per bag at 3mm depth

(depending on the smoothness of the
floor surface & application technique)
Gauging LiquidWater
3mm to 30mm
Working TimesUp to 20 minutes after mixing
(depending on ambient temperatures)
Drying TimesFoot traffic: approx. 4 hours

Loose lay floor coverings: approx. 8

Bond floor coverings: approx. 12 hours

On non-absorbent subfloors lay floor coverings: approx. 24 hours

(<3mm depth at +20°C, depending on
ambient conditions)
CleaningClean tools and equipment with
warm, soapy water immediately after


IMPORTANT: Before using Bostik Cempolatex Fibreflex, refer to the relevant Health & Safety Data Sheet, available at
All phases of installation should comply with the latest editions of:

  • BS 8102 Code of Practice for protection of structures against water from the ground.
  • BS 5325 Code of Practice for installation of textile floor coverings.
  • BS 8203 Code of Practice for installation of resilient floor coverings.
  • BS 8201 Code of Practice for installations of for flooring of timber, timber products and wood based panel products.


1. Ensure the subfloor is sound, clean, dry and of adequate tensile and compressive strength, free from loose material, laitance, cracks and structural defects. Ensure there is an effective damp-proof membrane, which conforms to BS 8203.

2. The subfloor should be tested in accordance with British Standards, using a properly calibrated and insulated hygrometer. A reading of 75% RH or less confirms that the subfloor is satisfactorily dry.

3. Any contaminants that may hinder adhesion, such as grease, oil, dirt, dust, plaster, some curing compounds, surface hardeners, additives and adhesive residues must be completely removed.

4. Any cracks or holes in the floor must be cleaned out and filled with Bostik Rapid Repair Mortar. Allowed to dry
before applying Bostik Cempolatex Fibreflex.

5. For optimum performance, a room temperature of +13°C to +18°C should be maintained for at least 24 hours prior to application. The temperature of the subfloor must be at least +5°C throughout the application and drying of the smoothing compound. Ensure that a maximum room temperature of +25°C is not exceeded during application.

Underfloor heating systems:
6. Warm water underfloor heating systems must be switched off for 48 hours before installation. Wait 48 hours after installation before gradually turning up underfloor heating.

7. Electrical underfloor heating mats: Bostik Cempolatex Fibreflex may also be used to encapsulate electrical radiant underfloor heating mats. There must be a minimum of 5mm to 6mm Bostik Cempolatex Fibreflex covering the mat before bonding tiling products, and 10mm before bonding resilient textile or timber flooring. Install cabling as per  anufacturer’s
instructions. Ensure the electrical cables are not damaged when installing the compound. The substrate to which the underfloor heating matting is fixed must be sound and stable.

8. Electrical underfloor heating systems must be switched off for 48 hours before installation. Wait 7 days after installation before gradually turning up underfloor heating.

Wooden surfaces:
9. The timber substrate should be solidly fixed and clean, with open joints over laid with flooring grade plywood. The plywood must be sealed to prevent moisture ingress on the underside and all edges. The plywood should be sealed with Bostik Cempolay Universal Primer to stop the ingress of moisture. The timber must be a minimum of 15mm thick and screwed down at 300mm centres.


10. In all cases, the subfloor must be primed prior to the application of the smoothing compound, as shown in the table below. Priming of absorbent surfaces is recommended to prevent rapid drying of the smoothing compound and minimise the formation of pinholes. See separate technical data sheets for primer application and drying details.

Bostik Cempolatex Fibreflex substrates

Absorbent substrates:Bostik Cempolay Universal Primer
(diluted 1:2 with water)
substrates including epoxy membranes:
Bostik Cempolay Universal or Bostik Epoxy Primer (for
applications above 10mm)
Calcium sulphate
Contact Technical Services
Wooden floors
(must be
Bostik Cempolay Universal Primer
(diluted 1:2 with water)
Flooring grade mastic asphalt screeds:Bostik Cempolay Universal Primer
neat (for applications up to 5mm max)
Metal decking:Contact Bostk Technical Services
Radiant underfloor
heating systems:
Contact Bostk Technical Services


  • 5 litres of water to 25kg Bostik Cempolatex Fibreflex.


11. According to the mix ratio above, pour clean, cold water into a clean mixing bucket. Gradually add Bostik Cempolatex Fibreflex powder to the water, whilst continually mixing with an electric drill and mixing paddle until a smooth, lump-free mixture is obtained. This will normally be achieved after 2 minutes. Do not under mix. After mixing, a maturing time of at least 2 minutes is recommended.

12. Do not mix more compound than you can use in 20 minutes. The mixture will remain workable for approximately 20 minutes under normal conditions. If the mix begins to stiffen before it has been spread, it must be discarded. Do not re-temper or add further water.

Note: the addition of too much water may result in separation of the compound.

13. Bostik Cempolatex Fibreflex can be applied from a minimum depth of 3mm, up to 30mm in a single application (5mm maximum total depth on mastic asphalt screeds and 10mm maximum depth on anhydrite subfloors).

14. Any subsequent layers (up to a maximum combined depth of 30mm) are best applied as soon as the first layer is set for walking, but still damp. If it is dry, an intermediate primer coat of Bostik Cempolay Universal Primer (diluted 1:2 with water) is required.


15. Pour the mixed material onto the prepared subfloor in a continuous operation and allow to flow.

16. Using a steel screeding trowel, spread evenly to the required depth and smoothness. Once laid, a second trowelling can be carried out after 15 to 30 minutes depending on site conditions.

17. Protect surface from foot traffic prior to laying a floor covering. Ensure the compound is fully dry before applying a floor covering.


18. Protect freshly applied product from strong sunlight and through draughts, as this can dehydrate the product, resulting in incorrect curing. Also, protect from rain and frost. Do not force dry the smoothing compound, as this may affect the curing process.

19. Application in high temperatures may result in rapid setting and poor flow. The rapid loss of water may increase the risk of cracking.

20. The drying time depends on how absorbent the subfloor is, the air humidity and both the ambient & floor temperatures.

21. Under good site conditions, Bostik Cempolatex Fibreflex will normally take foot traffic 4 hours after application and loose lay floor coverings after approx. 8 hours. Leave at least 12 hours before applying bonded floor coverings. The walk on time and setting time will be delayed if the powder has been stored in temperatures below +10°C, or has been applied in temperatures below +20°C.

22. The working and drying times of the compound will be reduced in higher temperatures and increased in lower


23. Clean tools and equipment with warm, soapy water immediately after use. Remove surplus compound from surfaces whilst it is still wet. Cured material can only be removed mechanically.

Bostik Cempolatex Fibreflex – PRECAUTIONS IN USE

Do not use as a substitute for a DPM. An effective membrane is required to prevent water entering the system.

Do not use a spiked roller, as this will pull fibres to the surface.

The mix ratios and temperatures need to be followed accurately. Changing the mix ratios will disrupt the system and risk product failure.


Based on 0 reviews

0.0 overall

Be the first to review “Bostik Cempolatex Fibreflex 25Kg – Pallet Deals and Bulk Buy – Highly Flexible Self Levelling Compound”

There are no reviews yet.


Buy The Pallet - Tile Adhesive and Floor Levellers Discount Store

5.0Out of 5 stars

Overall rating out of 16 Google reviews

Phil Down
3 hours ago

They actually answered the phone, were polite, knowledgeable and the order was delivered in full and on time. Would fully recommend both on price and service. Thank you.

3 weeks ago

BTP very helpful in supplying a pallet of floor leveller. I needed it on the Saturday, but didn’t want it sitting on the driveway for several days. I called and they recommended ordering for Thursday to give a day’s grace in case of any delivery issues. In the event the pallet arrived on Thursday as requested. Reliable and good value

Gary Harper
2 months ago

Great service, great price and great communications. We will definitely use Buy The Pallet again

Adrian W
4 months ago

Great service and delivery! Ordered all that I needed in one go and it was delivered to the back door wrapped and protected from the snow! Pallet even made it so that the goods were dry off the ground.

Stephen Tucker
4 months ago

Great customer service and at an unbeatable price. All delivered on the day I needed it.

Boon Teo
4 months ago

Great prices with a good ranges of products . Customer Service is excellent!

Max Simpson
5 months ago

Very helpful!

Neil Salih
3 years ago

Peter Bostock
3 years ago

I purchased a pallet of these and I am very impressed from ordering to receiving my pallet and the delivery guys were very helpful as well .I will definitely recommend and use this company again .Highly recommend

Kev in
3 years ago

Amazing knowledge and great prices! Definitely using these guys on a regular basis for my pallet deals on levellers and adhesive

Rob Faulkner
3 years ago

Fantastic experience with Buy The Pallet. Everything I needed to complete a large flooring project, quick delivery & quality products.

Richard Fairlie
3 years ago

Great service and really good pricing! Super fast delivery and really lovely guy!

Marc. T
3 years ago

Very helpful