Diatomaceous earth

Diatomite, or diatomaceous earth, is the skeletal remains of single-celled algae, called diatoms, whose cellulose membrane has the capability of extracting silica from water. Over millennia, the skeletal remains of diatoms built up and formed huge diatomite deposits. The lightweight and porous rock obtained from the fossilization of diatoms is the raw material of our products. Following treatment, diatomite forms a highly porous white or pink powder, marketed under the trade name Clarcel®.

Perlite

Perlite ore is a silica rock of volcanic origin that contains fine water droplets. It is expanded at high temperature, then crushed and graded, and constitutes our Randalite® and Randafil™ product ranges.

Filter aids

Filtration using mineral additives provides flexibility and ease of processing. It is suitable for all types of liquids and impurities. Today it is the reference technology in many industrial sectors, such as: 
• Agro-food and beverage industries: clarification after extraction, hydrolysis, pressing or fermentation of organic material of vegetable or plant origin
• Metallurgy: filtration of machining and roll fluids
• Chemicals: filtration of organic and inorganic chemical intermediates
• Pharmaceuticals: filtration of antibiotics and other active principles
Chemviron, Europe’s leading producer of filter aid, has extensive expertise gained over several decades in all these highly diverse sectors of activity.
Chemviron offers a comprehensive range of filter aids used as processing aids during industrial processes. They are marketed under the brand names Clarcel® and Randalite® and cover a wide range of permeabilities.
The Clarcel® and Randalite® product ranges are suited to all types of precoat filters:
• Roughing filtration on rotary filters and filter presses,
• Fine filtration and polishing filtration on frame and candle filters.
The porosity imparted by our filter aids to the filter cakes helps extend the treatment cycles while ensuring optimum clarification.
Compliance with stringent specifications ensures the high performance of Clarcel® filter aid.
The permeability of our products is controlled in real time. Systematic checks are also performed on other characteristics:
pH, moisture, loss on ignition, etc.
Chemviron’s processing aids treated at high temperature feature a high degree of chemical inertness. Particular attention is paid to the purity of our products.
Extensively present in the food industry, Chemviron ensures full traceability of its products, from selection of the ore to the filter aid’s packaging.

Functional fillers

Diatomaceous earth and perlite, marketed under the brand names Clarcel® and Randafil™ can be used as functional additives in many markets, such as paint, plastic or paper industry.
The outstanding properties of Chemviron’s diatomite and perlite make them remarkable functional additives, over and above their role in filtration applications. They are graded and selected on the basis of their particle size and whiteness.
Their particle size ranges are particularly suited to both waterborne and solvent-based paint formulations.
Chemviron’s functional additives impart a matt look to the paint, extend its lifetime, and improve its application qualities.
Our products Clarcel® and Randafil™ are also used in polyethylene film manufacture as « antiblocking » agents. They are also used to enhance the mechanical properties of certain polymers.
In the paper industry, they improve the printability of paper, and are also used as dispersing agents and opacifying agents.
The purity and high porosity of Chemviron’s diatomite and perlite make them top-grade ingredients for the manufacture of cosmetics and dental impressions.
Chemviron offers a comprehensive range of functional mineral additives serving the following main markets:
• paint et coatings
• plastics industry
• pharmaceuticals and cosmetics
• paper manufacture

Perlite Insulation

Developed some 40 years ago, the perlite insulation technique is a reliable and cost-effective process. Perlite is a rock of volcanic origin. The rock is crushed into a powder and heated to 900°C, when it expands to up to 20 times its original volume. This is expanded perlite, a totally inert thermal insulating material, ideal for the walls of liquid gas storage tanks as well as propane and methane carriers.
C-Perl® has an excellent insulation property having the light weight of expanded perlite. Thanks to these unique properties, perlite has found wide acceptance in the insulation of cryogenic and low temperature storage tanks, cold boxes. In addition to its thermal properties, perlite is easy to handle and is non-flammable.