Tech notes
Practical notes on filter paper selection, production and problem solving, written for filter makers and industrial buyers.
Filter paper, from the inside
Each note answers one question: if this parameter or process changes, what happens to the paper and the element? For a specific grade, contact us or browse the seven product families.
Selecting air filter paper: basis weight, thickness, air permeability and stiffness
Choosing air filter paper starts with the filter design, not the grammage. This note explains what each parameter controls and the order in which to fix them.
Oil filter paper: the properties that actually matter
Oil filter paper works under heat, pressure pulses and contaminants. We look at tensile strength, resin content, stiffness and contaminant holding capacity.
Fuel filter paper: balancing filtration precision and flow
Finer filtration costs pressure drop. This note covers fibre structure, pore size distribution and how to sequence the selection.
Flame-retardant filter paper: how it works and when to use it
Flame retardancy is achieved in several ways, and each affects permeability and strength. When does a filter actually need it?
Oil-water separation filter paper: how it works
Coalescing and separation are two different jobs. Fibre surface energy, pore gradient and flow rate decide whether water is actually removed.
Resin impregnation and curing: the invisible step behind element life
Resin content and cure level set stiffness, pressure resistance and temperature behaviour. We cover the control points that matter.
Slitting and roll control: width, roll diameter and splices
Slitting accuracy and winding tension decide how smoothly paper runs on your line. What to specify when ordering rolls.
Storage and moisture control for filter paper
Moisture changes permeability, stiffness and cure state. Warehouse conditions, stacking and tempering before use.
Troubleshooting common filter paper problems
Cracking, delamination, linting and permeability drift rarely have a single cause. A step-by-step route through the process.
Matching basis weight and stiffness in filter paper
Grammage is how much fibre; stiffness is whether the pleats hold. How the two relate to pleat height and element design.
Case note
Stamping, sheet metal and turning support for filter hardware
Beyond paper, a filter element needs end caps, centre tubes, guards and tooling. How we work with Balford on those three process families.
Discussing a specific specification?
Send the application, specification and quantity and we will advise on the grade.