UPFwaardes

UPFwaardes is a Dutch-language term used to describe Ultraviolet Protection Factor values assigned to textiles and garments. It mirrors the concept of UPF ratings used in other markets and serves to communicate how effectively a fabric blocks solar ultraviolet radiation. UPF indicates how much UV radiation reaches the skin through the fabric; higher values correspond to greater protection, for example a UPF of 50+ means only about 1/50th of UV radiation passes.

Measurement and standards: UPFwaardes are established through laboratory testing of fabric samples using UV spectrophotometry or radiometry, following international and regional standards. In Europe, UPF is determined according to EN 13758-2. In the United States, testing aligns with ASTM standards such as D6603. Australia and New Zealand use AS/NZS 4399. Tests consider UVB and UVA transmission across the 290–400 nm range, and the resulting UPF rating is typically reported on product labeling.

Applications: The concept is used in consumer labeling, product catalogs, and textile research. It helps consumers select garments with adequate outdoor protection. Some brands also provide information on how fabric properties such as color, weight, weave, and stretch influence UPF values.

Limitations: UPFwaardes reflect lab conditions for a specific fabric and finish; real-world protection depends on fit, moisture, wear, stretching, and how the garment covers the skin. Protection can change when fabric is wet or stretched, or when worn with other layers, so the value should be considered as a guideline rather than an absolute measure of daily protection.