Processing, refining and recycling of mineral grits – white fused alumina, SiC, glass beads and steel shot since 1909.
Wester Mineralien GmbH
Alfter-Witterschlick, Germany · Aleksandrów Łódzki, PolandNew on Amplifa
About Wester Mineralien
Wester Mineralien GmbH is a family-owned company founded in 1909, headquartered in Alfter-Witterschlick near Bonn, specialising in the processing, refining and recycling of mineral grits. At its own plant, blasting and abrasive media such as coated white fused alumina, regular alumina, platelet alumina, silicon carbide, glass beads and steel shot as well as mineral powders are processed. The service portfolio includes sieving (vibratory and ultrasonic sieving down to below 20 µm), air classification and aerodynamic classification below 50 µm, milling and rounding with jet mills, silanisation and coating, dedusting below 5 µm, drying, reprocessing as well as filling and packaging – also as contract processing with customer material. For quality assurance in the microgrit range, laser measurement of grain sizes is used. The grits are used, among others, in the ceramics, pigment and specialty chemicals industries, in additives, metalworking, the automotive industry, mechanical engineering, and as refractory materials. A second production site is Polmineral Sp. z o.o. in Aleksandrów Łódzki, Poland.
- Site
- Alfter-Witterschlick
- Processes
- Sieving (vibratory and ultrasonic sieving, classification), Classifying (air classification/aerodynamic classification, micro-fractionation below 50 µm), Coating/silanisation (chemical functionalisation with silanes and organic compounds), Dedusting (filtering and classification technology, fines below 5 µm), Drying (residual moisture control), Reprocessing (cleaning, drying, classification, dedusting), Milling/rounding (jet mills/air jet mills, mechanical rounding), Filling / packaging
- Materials
- White fused alumina (Al₂O₃, coated, micro and macro grits, iron-free), Regular alumina, Platelet alumina (purity above 99 % Al₂O₃, platelets with 1:4 aspect ratio, a few micrometres), Silicon carbide (black and green), Glass beads, Steel shot (round and angular, metallic blasting media), Titanium oxide (TiO₂), Silicon dioxide (SiO₂)
- Certificates
- ISO 9001:2015, ISO 9001
- Founded
- 1909
- Industries
- Ceramics, Pigments, Additives, Specialty chemicals, Metalworking, Automotive industry
- 01
Raw material intake
- 02
Drying
- 03
Milling/rounding
- 04
Sieving
- 05
Classifying (air classification)
- 06
Dedusting
- 07
Coating/silaniation
- 08
Quality inspection (laser measurement)
- 09
Filling/packaging
- 10
Shipping
Materials & Processes
White fused alumina (Al₂O₃, coated)
Iron-free fine blasting and abrasive grit in micro and macro grit sizes, available according to A-A-59316.
Regular alumina
Robust blasting and abrasive grit for machining and finishing.
Platelet alumina
Flat grit with a 1:4 aspect ratio, a few micrometres in size, purity above 99 % Al₂O₃.
Silicon carbide
Hard, heat-resistant abrasive grit in black and green, also for anti-slip surfaces.
Glass beads
Fine blasting media for gentle surface treatment, cleaning and matting of sensitive materials.
Steel shot
Metallic blasting media in round and angular for descaling, deburring and cleaning metallic workpieces.
Titanium oxide
Oxide for ultra-fine sieving and classification in pigment and specialty applications.
Silicon dioxide
Oxide for low-contamination ultra-fine sieving down to below 20 µm.
Silanisation/Coating
Chemical functionalisation of powders with silanes and organic compounds to improve wettability, dispersibility and adhesion.
Jet mills (air jet mills)
Milling and mechanical rounding for targeted control of particle shape and grain size.
Sites
Alfter-Witterschlick
DEHeadquarters, production/refining, sales
- Materials
- White fused alumina, regular alumina, platelet alumina, SiC, glass beads, steel shot, TiO₂, SiO₂
- Vibratory sieves
- Ultrasonic sieves
- Air classifiers/aerodynamic classifiers
- Jet mills
- Laser measurement systems (grain sizes)
Aleksandrów Łódzki
PLProduction site (Polmineral Sp. z o.o.)
Products & Grits
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Sieving (vibratory and ultrasonic sieving, classification)Engineering | – | – | – | – | Al₂O₃, TiO₂, SiO₂, Oxides, Additives, Powders |
| Classifying (air classification/aerodynamic classification, micro-fractionation below 50 µm)Engineering | – | – | – | – | Powders, Additives, mineral grits |
| Coating/silanisation (chemical functionalisation with silanes and organic compounds)Surface | – | – | – | – | Powders, Oxide minerals, Fillers |
| Dedusting (filtering and classification technology, fines below 5 µm)Engineering | – | – | – | – | mineral powders, grits |
| Drying (residual moisture control)Engineering | – | – | – | – | Oxides, Additives, powder blends, mineral powders |
| Reprocessing (cleaning, drying, classification, dedusting)Engineering | – | – | – | – | mineral materials, raw materials |
| Milling/rounding (jet mills/air jet mills, mechanical rounding)Engineering | – | – | – | – | Powders, Additives, mineral grits |
| Filling / packagingAssembly | – | – | – | – | mineral powders, grits |
4 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Vibratory sieves / ultrasonic sieves | – | – | Ultra-fine sieving down to below 20 µm | – | Alfter-Witterschlick |
| Air classifiers / aerodynamic classifiers | – | – | Grits below 50 µm | – | Alfter-Witterschlick |
| Jet mills (air jet mills) | – | – | – | – | Alfter-Witterschlick |
| Laser measurement systems (laser measurement of grain sizes) | – | – | Microgrit range | – | Alfter-Witterschlick |
Additional services
Quality
For quality assurance of grain size determination in the microgrit range, state-of-the-art laser measurement is employed; controlled process parameters and continuous quality inspection ensure consistent grain size distribution and defined maximum grain limits. The company is certified to ISO 9001:2015 and REACH-registered for Al₂O₃ and SiC.
| Evidence | Alfter-Witterschlick | Aleksandrów Łódzki |
|---|---|---|
| ISO 9001 |
History
- 1909
Foundation as a family business
Development from a family business into an internationally operating company for grit technologies with production sites in Germany and Poland