# What is the specific protective difference between Type 4B and Type 5B industrial fabrics?

> Source: https://breathablefilm.com/news/knowledge-center/difference-between-type-4b-and-type-5b-industrial-fabrics/
> Author: kh_sales02
> Published: 2026-05-05
> Updated: 2026-08-28

## Key takeaways

- Type 4B (EN 14605) is spray-tight, engineered to block high-intensity pressurized liquid chemical sprays, and often requires taped seams for a total liquid seal.
- Type 5B (EN ISO 13982-1) is particle-tight, designed to filter out hazardous dry dust and solid particulates through overlap and material filtration rather than seam sealing.
- Both are also certified biological barriers against infectious agents under EN 14126, so the choice depends on whether the environment presents pressurized liquid hazards or airborne dry particulates.

## Frequently asked questions

### What is the specific protective difference between Type 4B and Type 5B industrial fabrics?

Type 4B and Type 5B differ by the physical state of the hazard: Type 4B (EN 14605) is spray-tight, engineered to block high-intensity pressurized liquid chemical sprays and often requires taped seams for a total liquid seal, while Type 5B (EN ISO 13982-1) is particle-tight, designed to filter out hazardous dry dust and solid particulates through overlap and material filtration rather than seam sealing. Both are also certified biological barriers against infectious agents under EN 14126, so the choice depends on whether the environment presents pressurized liquid hazards or airborne dry particulates.

### Why does Type 4B need taped seams while Type 5B doesn't?

Type 4B must hold back pressurized liquid sprays, and any gap at a seam would let liquid through under pressure, so taped seams are used for a total liquid seal. Type 5B only needs to filter dry particulates, which don't behave like pressurized liquid, so overlap and material filtration at the seams are sufficient without taping.