Synchro® Chromium VI Reducers

Chryso’s advanced range of Chromium VI reducers supports safer cement manufacturing by minimizing health risks.

Our chloride-free, and sustainable additives reduce Cr(VI) levels below 2 ppm after hydration — ensuring employee safety, regulatory compliance, and production efficiencies with long shelf-life in cement, no spotting in concrete and robust EHS performance.

Industry-first Non-Carcinogenic Option

Chloride-Free Portfolio

Simplified and Precise Dosing

Chryso® Patented Technology

REDUCE Chromium (VI) levels safely
up to zero ppm*

Chromium (VI) level reduction for safety

Challenges:

Health & Safety: Exposure to hexavalent chromium (Cr VI) is linked to cancer, skin irritation, ulcers, and lung damage.
European Directive 2003/53/CE: Cement must contain no more than 2 ppm of hexavalent chromium (Cr VI) after hydration, making chromium reduction essential.
Concrete Aesthetics: Use of iron sulphate can result in brown spots on concrete surfaces, particularly if mixing or dosage is inconsistent.
Period Shortages of Iron Sulphate: Intermittent shortages of iron sulphate are driven by reduced production and increased demand from the electric vehicle industry.

Why Chryso Chromium Reducers

Main Benefits vs Iron Sulphate Powder

No capex required for powder handling
Extended shelf-life of treated cement
Long shelf-life of Cr (VI) Reducer
No yellow staining observed in concrete
Easier and more precise product dosing
Non-carcinogenic alternative available
Liquid solutions; no risk of caking due to humidity
No corrosion in storage and dosing systems

Our Products

Synchro® 200 / 250

Liquid solution for cement

Dosage Efficiency ★★★★☆
EHS Profile ★★★☆☆
Shelf-Life in Cement ★★★★☆
Easy-to-Use  ★★★★★

Key benefits:

Low-dosage liquid additive for precise, maintenance-free dosing.
Fully compatible with existing cement additives

Synchro® 300

Liquid solution for cement

Dosage Efficiency ★★★★☆
EHS Profile ★★★★★
Shelf-Life in Cement ★★★★★
Easy-to-Use  ★★★☆☆

Key benefits:

Only solution in its class with no hazard symbols.
12-month performance in cement ensures longterm stability.

Synchro® 180P

Powder Additive for cement

Dosage Efficiency ★★★★★
EHS Profile ★★☆☆☆
Shelf-Life in Cement ★★★☆☆
Easy-to-Use  ★★☆☆☆

Key benefits:

Practical dry option, fully compatible with existing additives
No ADR Transport Required

Synchro® 119P

Powder Additive for mortar

Dosage Efficiency ★★★☆☆
EHS Profile ★★☆☆☆
Shelf-Life in Cement ★★★☆☆
Easy-to-Use  ★★☆☆☆

Key benefits:

Practical dry option, fully compatible with existing additives
No ADR Transport Required

Decrease Chromium VI, While prioritzing employee safety & preserving cement performance

Cr(VI) levels stay well below 2 ppm for 6 months in both CEM I and CEM II using 80 ppm Synchro® 300.

Reference mixes not using additive remain above the 2 ppm limit, posing higher health risks.

Compressive strength is fully retained and even improved at 2, 7, and 28 days compared to reference samples.

Synchro® 300 (85 ppm) delivers reliable and sustained reduction of Chromium VI levels in Cem I cement, maintaining values well below the 2-ppm regulatory limit for a full 12 months.

Unlike untreated cement, which gradually declines but remains above the threshold, Synchro® 300 ensures immediate and significant reduction of worker exposure to hazardous Cr(VI).

Case Study: How Synchro® 300 Delivers Proven Long-Term Chromium VI Reduction

Cement: CEM II/A-LL 42.5R
Initial Cr(VI): 9.5 ppm (untreated)
Result: Reduced to 0 ppm, stable for 6 months
Dosage: Synchro® 250 at 950 ppm (optimized for high and variable Cr(VI) levels)

Customers prefer liquid reducers over ferrous sulfate, which is avoided due to iron oxidation and surface staining (brown spots on concrete).

Case Study: Industrial Trial Success with Synchro® 250

Synchro® Chromium VI Reducers