Every day, laboratories rely on accurate analyses to support their decisions. Whether it’s silage, manure, vegetables, or valuable raw materials such as vanilla, the quality of the analysis stands or falls with the sample preparation. One crucial step in this process is grinding. Contamination during this process can skew measurement results and lead to unreliable conclusions. That’s why using a contamination-free sample mill isn’t a luxury—it’s a technical necessity. In this article, we explain why contamination-free grinding is essential and how industrial sample mills make all the difference.
In many laboratories, samples are analyzed daily using techniques such as NIR spectroscopy (Near-Infrared spectroscopy). Among other things, this involves determining the dry matter content, protein content, minerals, and trace elements. “All samples taken are dried, ground, and prepared—in other words, made suitable for further analysis,” explains Ruud Veerman of Peppink Mills. “It is precisely at this stage that the risk lies. If residual material from a previous sample remains in the mill, it can affect the next sample. In analyses where small differences have major consequences—for example, in feed value or soil testing—that is unacceptable. That is why contamination-free grinding is so important.”
Contamination occurs when a sample is contaminated by residues from a previously ground product or by wear and tear on parts. In agricultural and food labs, this can lead to incorrect nutritional advice for farmers, false quality claims, or even the rejection of products. “You want to know what’s really in a product,” says Ruud. “Anyone who wants to know that—including government agencies, agricultural labs, and/or food research institutes—must be able to trust the results. That trust starts with a clean, robust, and reproducible grinding solution.”
A contamination-free sample mill is specifically designed for the safe and consistent grinding of samples. At Peppink Mills, the 200CM and 200AN-C2 sample mills have been developed to process large numbers of samples per day without cross-contamination. Sample mills that grind without contamination. “These mills aren’t just small tabletop models. Even the smallest sample mill weighs 165 kilograms and runs on high-voltage power,” Ruud explains. “That robust design ensures stability, uniform grinding, and minimal wear. More importantly, the mill cleans itself, so every sample starts out clean.”
The principle of contamination-free grinding applies to a wide range of applications. In agricultural labs, silage, corn, and manure, among other things, are ground for analysis. In vegetable and soil research, it helps explain why “one onion grows better on a certain patch of land than on another,” Ruud explains. “Contamination is also disastrous when it comes to expensive raw materials. Vanilla beans are a costly product, and they can be ground exceptionally well with a Peppink mill. The mill is then built to food-grade standards, so the ground product can be safely collected in a glass jar or plastic bag. Fully tailored to the customer’s needs.”
Not every laboratory analyzes hundreds of thousands of samples per year, but an industrial solution becomes worthwhile once the volume reaches about 20 to 200 samples per day. Large laboratories have been using Peppink sample mills for decades. “These are laboratories that analyze hundreds of thousands of samples per year,” says Ruud. “In addition, sample mills often serve as a bridge to production mills. Lab-scale tests can be scaled up to industrial capacity without compromising grinding results or reliability.”
For laboratories that want to deliver reliable analyses, contamination-free grinding is essential. A high-quality, contamination-free sample mill prevents cross-contamination, improves reproducibility, and protects the integrity of measurement results. As a result, the right grinding solution directly contributes to quality, efficiency, and credibility.
Is your laboratory looking for a robust, industrial sample mill for contamination-free grinding? Discover the possibilities and invest in reliability starting with your very first sample. Contact us.