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J. Rettenmaier & Söhne GmbH

Level up your Ceramics! Design your Pores! 

JRS offers a wide range of functional, plant-based cellulose and lignocellulose particles. Our products are available in various sizes (from a few micrometers to several millimeters) and structures (fibers, particles, spheres, granules, gels). Take the opportunity to control your pore volume, structure and size. Additional advantages are short drying times, low reject rates, less cracks and fissures and a high flexibility of your ceramic masses. At this year’s ceramitec we want to put our plant-based hydrocolloids and biopolymers into focus. They could be especially interesting for additive manufacturing of ceramic parts. The following types are available in industrial quantities. 

Hydroxypropyl Methylcellulose (HPMC): 

Aqueous systems of this cellulose ether can increase the viscosity and form gels upon heating. A special property is the reversibility of this thermal gelation. HPMC is mainly defined by the degree of substitutions (DS) and the viscosity. Thereby thickening of mixtures can be regulated and different gelling points can be achieved. 


A natural hydrocolloid extracted from brown algae with excellent rheological properties. Among other hydrocolloids, alginates differ in their capacity to react with calcium ions and other di- or trivalent ions. By this reaction the rheology changes and the state of aggregation changes from liquid to solid. Therefore water insoluble, temperature stable gels and films can be produced. For example, foils with barrier properties or protective coatings can be prepared. The sudden conversion into a cut-resistant gel, to a frozen condition is also conceivable. This is used, for example, to shape ceramic spheres or to encapsulate active substances. The processing is carried out by immersion, spray or co-extrusion method as well as microencapsulation. 

Microcrystalline Cellulose Gel (MCG): 

MCG is a gel forming agent which is co-processed from MCC and a water soluble thickener such as e.g. CMC or xanthan. The thickener in combination with the MCC ensures an easy dispersibility and prevents the aggregation of the MCC particles in water. To activate the MCG and form a gel, high shear mixing is necessary.

After activation in water, MCG forms a 3-D elastic gel-network of insoluble cellulose fibrils. 


Pectins are versatile biopolymers which are found in the cell walls of fruits, especially citrus fruits and apples. Pectins are complex polysaccharides that chemically consists of partial methyl esters of polygalacturonic acid and their salts (sodium, potassium, calcium and ammonia). 

JRS the company: 

As an owner-managed, independent family business group, we have stood for innovation, long-term perspectives, reliability and security for more than 140 years. Successful since 5 generations. More than 3500 employees at over 90 production and sales locations worldwide are committed to the innovative JRS plant fiber technology. 

Better – green – intelligent. Nature offers an almost inexhaustible reservoir of usable functions that have always been part of the plant world.

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