What is calcium formate used for in construction?

Calcium formate is used as a chloride-free accelerator in cement-based products. It accelerates early strength development in tile adhesives, dry-mix mortars, concrete admixtures, and flooring compounds. Typical dosage is 0.5–2% by cement weight.

Is calcium formate chloride-free?

Yes. Calcium formate (CAS 544-17-2) is entirely chloride-free, making it safe for use in reinforced concrete and steel-frame construction where chloride-based accelerators would cause corrosion risk. It meets the requirements of EN 934-2 for concrete admixtures.

What is the dosage of calcium formate in tile adhesive?

In tile adhesive formulations, calcium formate is typically dosed at 0.5–2% by dry cement weight. Higher dosages increase early strength but may reduce open time. Always test in combination with HPMC and RDP to balance setting time and workability.

Why is RDP critical for tile adhesives in GCC climates?

In GCC countries, exterior facade temperatures can cycle from 15°C at night to 75°C+ on sun-exposed tile surfaces during summer days — a thermal differential of 60°C+ in a single day. Unmodified cementitious tile adhesives are rigid and brittle — they cannot accommodate the dimensional movement of large-format porcelain tiles under this thermal cycling and will crack, debond, or cause tiles to pop. RDP-modified (polymer-modified) tile adhesives (C2TE class per ISO 13007) provide the deformability and bond strength to accommodate GCC thermal movements over the 25–50 year life of facade systems. For GCC projects, C2TE or C2S2 classified tile adhesives with 3–5% RDP are the minimum acceptable specification.

What is the difference between RDP and liquid polymer emulsion in tile adhesive?

RDP (redispersible polymer powder) is a spray-dried version of polymer emulsion — it is pre-mixed into the dry powder bag at the factory, providing a single-component product that the applicator just adds water to on site. Liquid polymer emulsion requires a two-component system where the liquid is mixed separately with the dry blend — this is more complex and less consistent at the job site. For GCC dry-mix mortar industry, RDP is strongly preferred as it enables consistent quality, simpler logistics, and ease of use at remote construction sites across Saudi Arabia, Oman, and Qatar.

Construction Chemicals — Cement Accelerator

Calcium Formate 98% — Chloride-Free Cement Accelerator

CAS 544-17-2 · Construction grade · 98% min purity · Accelerates early strength in tile adhesives, dry-mix mortars and concrete admixtures without chloride risk. Supplied across UAE and Saudi Arabia in 25 kg bags.

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Technical Specifications

PARAMETER	SPECIFICATION	TEST METHOD
Purity (as Ca(HCOO)₂)	≥ 98.0%	Titration
Appearance	White crystalline powder	Visual
Moisture content	≤ 1.0%	Karl Fischer
Heavy metals (as Pb)	≤ 10 ppm	ICP-OES
Chloride content	≤ 0.01% (100 ppm)	Ion chromatography
Bulk density	800–1,000 g/L	EN 1097-3
pH (10% solution, 20°C)	6.5–7.5	pH meter

How Calcium Formate Works as a Cement Accelerator

Calcium formate accelerates the hydration of Portland cement by increasing the concentration of calcium ions in the pore solution and accelerating the dissolution of C₃S (tricalcium silicate) — the primary strength-forming phase in cement. This leads to faster formation of calcium silicate hydrate (C-S-H) gel, resulting in higher early compressive strength at 1 and 3 days without significantly affecting 28-day strength.

Unlike calcium chloride — the traditional cement accelerator — calcium formate is completely chloride-free. This is critical in reinforced concrete and tile adhesive applications where chloride ions would cause corrosion of embedded steel reinforcement. Calcium formate complies with EN 934-2 requirements for chloride-free concrete admixtures.

Applications

Tile Adhesive & Grout

Dosage 0.5–2% by dry cement weight. Reduces set time and increases early bond strength. Particularly effective in C1/C2 class polymer-modified tile adhesives. Compatible with HPMC (open time preserving) and RDP (flexibility).

Dry-Mix Mortar

Used at 0.5–1.5% in floor screeds and repair mortars to achieve early strength for foot traffic. Suitable for bag mortar products requiring fast turnaround on site. Does not affect long-term strength when dosed within specification.

Concrete Admixture

Used as a non-chloride accelerating admixture compliant with EN 934-2. Suitable for precast concrete elements and cold-weather concreting where early strength is required. Typical dosage 0.5–2% by cement weight.

EIFS & External Render

Added to external insulation and finish systems base coat and adhesive mortars to improve early strength and adhesion to substrate. Formulated alongside HPMC, RDP, and redispersible silica.

Dosage & Formulation Guide

Application	Dosage (% by cement wt)	Effect
Tile adhesive (C1/C2)	0.5–1.5%	Faster set, improved early bond strength
Floor screed / repair mortar	0.5–2.0%	Earlier foot-traffic strength
Concrete admixture	0.5–2.0%	Accelerated early compressive strength
EIFS base coat	0.3–1.0%	Improved adhesion and early hardening

Key Properties & Advantages

Chloride-free — safe for reinforced concrete and steel-frame applications, no rebar corrosion risk
High purity 98% — low impurity level ensures consistent performance batch to batch
Compatible with PCE and HPMC — can be used in the same dry-mix formulation without antagonistic effects
No plasticising effect — does not reduce mortar stiffness or tensile bond strength
EN 934-2 compliant — meets European standard for concrete admixtures (non-chloride accelerator)
Easy to handle — free-flowing powder, dustless grades available, low hygroscopicity at normal humidity

Packaging & Storage

Available in 25 kg multi-wall paper bags. Store in a cool, dry place away from moisture. Shelf life 24 months from production date in sealed original packaging. Calcium formate is slightly hygroscopic — reseal bags after use.

Frequently Asked Questions

Calcium formate is used as a chloride-free accelerator in cement-based products including tile adhesives, dry-mix mortars, concrete admixtures, and flooring compounds. Typical dosage is 0.5–2% by cement weight.

Yes. Calcium formate (CAS 544-17-2) is entirely chloride-free, with chloride content ≤ 0.01%. Safe for reinforced concrete. Complies with EN 934-2 for chloride-free concrete admixtures.

Raykem supplies calcium formate at 98% minimum purity, construction grade, in 25 kg bags. Full Certificate of Analysis and Safety Data Sheet are provided with every shipment.

In tile adhesive formulations, calcium formate is typically dosed at 0.5–1.5% by dry cement weight. Always test in combination with HPMC and RDP to balance setting time and workability for your specific formulation.

Request Calcium Formate Pricing

Stocked in Dubai. Supply to UAE, Saudi Arabia, Qatar, Kuwait, Bahrain and Oman. Certificate of Analysis and SDS included.

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