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ing be practical and demonstrated. For example, you can teach “the hum test” for proper earplug fitment (place one earplug in and hum; the sound should be considerably louder in the unplugged ear. If not, the earplug is not doing its job and is not inserted prop- erly). Ear plugs when properly fitted should have a fair amount of resistance to being pulled out and should not be just hanging in the ear canal opening. Study of the proper use of these devices can make the training more practical and interesting. NIOSH has several publications


on the prevention of industrial hear- ing loss available for free download; especially helpful is publication 96-110, “Preventing Occupational Hearing Loss—A Practical Guide.” Hearing is a precious thing and metalcasters have a steward- ship responsibility to care for the health and well-being of the people entrusted to them.


Fig. 5. The figure, drawn from www.safe-at-work.com provides an overall perspective of the actual sound attenuation value of various earmuff types compared to laboratory use of the same devices.


August 2017 MODERN CASTING | 25


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