Cryogenic Milling

Thermal Control

Liquid nitrogen or dry ice cools the grinding chamber to prevent the sample from melting or degrading during the high energy process. Because many synthetic fibres soften under friction, cryogenic milling maintains the chemical integrity of the specimen by removing heat. The cold environment makes the polymer brittle so it fractures rather than smears.

Grinding Mechanism

Impact mills or hammer mills operate at high speeds inside a vacuum jacketed or insulated housing. A batch of fabric scraps undergoes pre-cooling before the motor drives a steel blade or ball to pulverize the frozen material. This cycle continues until the particle size reaches the micron range required for testing standards.

Maintaining a steady flow of coolant prevents the chamber from warming up and allows for the processing of large sample batches for bulk verification.

Sample Quality

Uniform particle distribution allows for faster and more complete extraction of restricted substances from the polymer matrix. Without the use of cryogenic milling, heavy metals or phthalates might remain trapped inside thick plastic components. Finely ground powders provide the maximum surface area for chemical contact.