Table 2 Evolution of the enhanced preventive programme after the 1998 survey.

Year	Control type	Description of control
1999	Engineering	HEPA filters added to air handlers in non‐production areas
1999	Engineering	Downdraught table added for respirator cleaning
1999	Engineering	Administrative offices physically separated from production areas
1999–2001	Engineering	Air showers added at all exits from production areas
1999	PPE	Half‐face negative pressure respirators required in production areas
1999	PPE	Shoe covers worn over work shoes in non‐respirator areas
2000	Engineering	Lapping area enclosed
2000	PPE	Facility uniform changed to long‐sleeved jumpsuits
2000	PPE	Latex glove use required in production areas
2000	PPE	Aprons added for machining operations
2000	PPE	Water‐resistant* garments added for wet operations
2001	Engineering	Reusable tacky mats installed at all production area exits
2001	Engineering	Enclosures installed around all mechanical presses
2001	Engineering	HEPA‐filtered ventilation system for respirator storage room added
2001	PPE	Water‐resistant coverall added to lapping area garments
2001	PPE	Respiratory protection standardised to loose‐fitting PAPR†
2002	Administrative	Gloves required for handling work shoes and respirators
2002	Administrative	Production workers clean work areas 15 min/shift and 1 h/month
2002	PPE	Respirator belts replaced with non‐woven belts for easier cleaning
2002	PPE	Waterproof* coveralls and shoe covers, taped gloves required for lapping
2002	PPE	Waterproof garments replaced water‐resistant ones for other wet operations
2002	PPE	Aprons/smocks required for forming and dry machining operations
2003	Administrative	“Transition shoes” used between production and locker areas
2003	Administrative	Workers required to clean transition shoes monthly

HEPA, high‐efficiency particulate air; PPE, personal protective equipment.

*Water‐resistant refers to materials such as Tyvek; waterproof refers to materials such as Saranex.

†Powered air‐purifying respirator.