CAS No: 9004-34-6 · HS Code: 4706.30
Cellulose Fibre (CAS 9004-34-6) is a dry-mix mortar additive that acts as micro-reinforcement in cementitious and gypsum-based construction products. When incorporated into dry-mix mortars, the fibres form a three-dimensional network within the cured matrix that bridges micro-cracks, reduces plastic shrinkage cracking, and improves workability by preventing mortar segregation and sagging on vertical surfaces. In GCC construction markets — where the extreme thermal cycling of concrete and plaster substrates promotes cracking — cellulose fibre is an increasingly specified additive in renders, plasters, EIFS base coats, and repair mortars.
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| PARAMETER | SPECIFICATION | TEST METHOD |
|---|---|---|
| CAS Number | 9004-34-6 (cellulose) | |
| Raw Material | Wood pulp cellulose (softwood kraft) | |
| Appearance | White to off-white fibrous powder | Visual |
| Fibre Length | 100 – 1,500 μm (grade dependent) | Optical microscopy |
| Fibre Diameter | 20 – 30 μm (typical) | |
| Moisture Content | ≤ 8.0 % | ISO 638 |
| Bulk Density | 50 – 200 g/L (fluffy) | |
| pH (suspension) | 6.5 – 8.0 | |
| Typical Addition Level | 0.1 – 0.5% on dry mix weight | |
| Shelf Life | 24 months in sealed bags, < 35°C |
Plastic Shrinkage Crack Control in Render
Cellulose fibres distributed throughout fresh render and plaster bridge plastic shrinkage cracks as they form during drying — reducing crack width and frequency in GCC exterior renders exposed to rapid drying under hot sun and low humidity.
EIFS Base Coat Reinforcement
Used in EIFS base coat mortars applied over polystyrene insulation boards on GCC building facades — fibres supplement the glass fibre mesh reinforcement and resist micro-cracking from thermal movement.
Sag Resistance in Vertical Applications
Cellulose fibres improve the anti-sag and anti-slump properties of machine-applied renders and hand-applied plasters on vertical walls — reducing the risk of mortar runs on GCC hot weather application days.
Repair Mortar Crack Bridging
Added to concrete repair mortars for GCC infrastructure repair projects to improve crack bridging capacity of repaired surfaces and reduce differential shrinkage cracking between repair material and parent concrete.
Tile Adhesive Workability Improvement
Improves the trowelability and reduces stringiness in tile adhesives — makes the adhesive easier to comb and provides better coverage of the tile back with notched trowel application.
Add at 0.1–0.3% on total dry mix weight for standard renders and plasters. For crack-critical EIFS base coats: use at 0.2–0.5%. Combine with HPMC (0.2–0.3%) and RDP (2–4%) for a fully optimised GCC exterior render system. Disperse fibres in dry blend before liquid addition — fibres clump if added to wet mortar. In machine-applied systems: verify that fibre length is compatible with pump and spray nozzle dimensions. Contact Raykem for fibre length grade selection.
Store in sealed bags below 35°C in a dry covered warehouse. Cellulose is hygroscopic — moisture uptake increases bulk density and reduces dispersibility. Shelf life: 24 months.
Full Certificate of Analysis (COA), Safety Data Sheet (SDS/MSDS), and Technical Data Sheet (TDS) supplied with every shipment from Dubai or Riyadh.
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