Meltblown materials are formed from fine fibres, and fibre diameter, web uniformity and basis weight all affect resistance and dust holding behaviour. Electret treatment uses charge to improve capture of fine particles.
Material is not a single parameter
Meltblown media of the same basis weight can behave differently when the fibre structure or electret process differs. Selection should consider the filtration target, use environment and processing method together.
Sampling and testing matter
Electret performance can be affected by storage, processing and the operating environment. Projects should confirm key indicators at sample stage and set out test conditions and acceptance methods in the technical agreement.