Puristusaste

Puristusaste is a Finnish term that roughly corresponds to the degree or level of compression. In everyday and technical usage it describes how much a material or object has been compacted relative to its original size, and it is commonly expressed as a percentage or as a dimensionless ratio. The exact definition can vary by field, which means the term is not always tied to a single, universal formula.

In materials science and engineering, puristusaste is often linked to a uniaxial compression process. A common way to express it is through relative deformation: puristusaste = (ΔL / L0) × 100%, where L0 is the original thickness or length and ΔL is the reduction after loading. In such contexts the term may be used alongside or interchangeably with concepts like strain or density changes, depending on what is being measured (length, thickness, or volume).

In other industries, such as packaging, papermaking, or food processing, puristusaste can describe the degree of compaction achieved during pressing or extrusion. This affects properties such as density, porosity, texture, and mechanical strength, and is often monitored to ensure product quality and process consistency.

Because Finnish terminology often differs between sectors, puristusaste does not have a single, universal definition. Readers should consult context-specific sources to confirm the intended measurement, units, and any accompanying standards.

See also: compressive strength, strain, compression, material testing.