Ossido HQ

Micronised Quicklime of the highest purity, obtained from the finest stone fractions. A highly reactive product, ideal for the most demanding applications in the chemical industry.

Ultra-pure Quicklime for the chemical industry

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The Lime System developed Ossido HQ to meet the most stringent requirements of the chemical sector, where material purity is essential to ensure excellence in production processes. This micronised calcium oxide stands out for its high reactivity and superior purity, making it the ideal product for the manufacture of calcium salts and sophisticated chemical applications.

Its highly reactive nature ensures rapid and efficient dispersion, while its purity guarantees the absence of contaminants in finished products. Production undergoes rigorous quality control at our Fassa I-Lab research centre, ensuring a consistent, reliable product that meets the highest standards of the chemical industry.

Certified sustainability with EPD declaration

Our commitment to environmental sustainability is officially certified through our Environmental Product Declaration (EPD). This document, based on a rigorous Life Cycle Assessment (LCA), offers a transparent and scientific evaluation of our products’ environmental footprint.

Sustainability

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Supply formats
Grain sizeSilo truckDump truckBig bags
0-1 mm✅❌✅
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Ossido HQ Discover all the features of the Ossido HQ product and download the documentation

The production of Ossido HQ begins with the exclusive selection of the finest Quicklime fractions, in the 3-9 mm and 8-20 mm size ranges. These are subjected to an advanced grinding process to micronise the material. Soft burning of limestone, combined with the use of biomass as fuel, ensures a final product of exceptional reactivity and chemical purity.
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Services for the chemical industry

Our team of experts supports you in optimising your production processes, helping you to customise the product according to your specific technical requirements. We provide assistance in the design of dedicated storage and dosing systems, comprehensive chemical-physical analyses at our Fassa I-Lab laboratory, and ongoing technical consultancy. Our logistics service ensures punctual, flexible deliveries – essential for keeping your production running smoothly.
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Explore all other lime-based products
in the Fassa Bortolo Lime System

Agricalce Quicklime

Available in various grain sizes and MgO contents, it is the ideal solution for soil liming in the agricultural sector. It neutralises acidity, improves soil structure, and increases crop productivity, significantly reducing the need for chemical fertilisers.

Calcitic Quicklime

Produced through an exclusive soft burning process using biomass fuel, this lime ensures maximum reactivity and low CO₂ content. The rigorous selection of limestone and ongoing quality controls guarantee high purity for consistent, reliable performance.

ELC

The ELC line combines a high CaO content with extremely low carbon and impurity levels. Its outstanding reactivity, thanks to the soft burning of limestone and the resulting high specific surface and porosity, makes it the perfect choice for the production of stainless steel and low-carbon steel.

Fassasoil

A specialised line for soil stabilisation. Thanks to its exceptional reactivity, it achieves the desired strength values using less material. The optimised particle size, developed from Fassa Bortolo’s extensive experience in this field, ensures maximum efficiency and ease of use on site.

Flow Lime

Finely ground products with excellent fluidity, enhanced by special fluidizing agents and optimized particle size distribution. Direct lime injection into slag and fast dissolution ensure maximum efficiency, while reduced dust production improves safety and environmental conditions.

Latest updates from the Lime System – Fassa Bortolo

16Oct2025
Fassa Bortolo Lime System and Politecnico di Milano: where research meets industry.
Reducing CO₂ emissions starts with a better understanding of materials. At the 7th European Steel Technology and Application Days (ESTAD 2025), Politecnico di Milano presented a study promoted by Fassa Bortolo on the natural CO₂ capture potential of EAF and LF steel slags.
14Sep2025
Geosciences and the challenges of the 21th century
From September 16 to 18, 2025, in Padua, Fassa Bortolo will take part in the conference “Geosciences and the Challenges of the 21st Century” to share its contribution on research and practical applications in the field of secondary raw materials and the circular economy.
15Mar2025
Fassaroad – An Innovative Solution for Road Infrastructure
STOP dust on road construction sites. FASSAROAD is a lime milk-based suspension that eliminates dust clouds, preventing bitumen from being removed by construction vehicles.
25Sep2024
Best Supplier for Sustainability
We are proud to announce that during the “Supplier Event” held in Toledo (Ohio, USA) on September 25, Fassa Bortolo was recognized by Owens Corning as the Best Supplier 2024 for Sustainability.

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    Fassa S.r.l.
    via Lazzaris, 3 – 31027 Spresiano TV
    C.F./P.IVA 02015890268
    Cap. Soc. € 50.000.000,00
    Reg. Impr. TV 02015890268

    T +39.0422.7222
    F +39.0422.887509

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