Belte r r a Cor p or at ion S afety M an ual D oc I D C H S M BE L 2 0 1 7 Pa g e 1 92 of 53 8 Doc u m e n t Identif icat ion S E L 022 P age Nu m b e r 5 of 7 Doc u m e n t C r e ation Dat e Ma y 10 2011 Im p le m e n tat ion Dat e o n Re vised Doc u m e n t F e bru a r y 2 2016 52 Ea rplu g s Ea rplu g s a r e he a ring p rot e c ti on de vice s whi c h a r e inser ted into t he e a r c a n a l Ea rplug s mus t fit snu g ly a nd se a l t he e a r c a na l t o provide a de qu a te noise a t tenua ti on to prote c t t he i nne r e a r E a rplug s mus t c ompl y with C S A St a nda rd Z 942 M1984 The re a re a va ri e t y o f dif fe re nt e a rplu g s a v a il a ble but t he most c omm on t y p e s a re e x pa nda ble f oa m o r pre for med plu g s with fla ng e s To ge t t he be st fit t he e a r should b e pull e d b a c k with t he opposi te ha n d to stra ig hten th e e a r c a n a l a nd the e a rplu g inser t e d w it h c lea n ha nds Ea rplug s c a n wor k loos e th rou g h the da y a nd ther e for e shoul d be re se a ted pe riodic a ll y Ea rplu g s a r e e it he r dispo sa ble use d onl y onc e or re usa ble W it h pro pe r c a re the la tt e r c a n be us e d f or up to s ix mont hs R e usa b le e a rplu g s mus t b e r e g ular l y insp e c ted a nd c lea ne d w a she d with m il d soa p a nd a ll owe d to dr y in a c lea n e nvironmen t I f the e a rplu g be c omes ha rd o r is not a ble to pr ovide a good se a l t he e a rplu g s mus t be r e pla c e d 53 C lasse s of H e a ring P rot e c ti on He a rin g prot e c tors a re c l a ssi fie d a s C lass A B o r C ba se d on the mini mum noise a tt e nua ti on a t var i ous a ssi g ne d fr e qu e nc ies Cl a ss A pr ovides the hig h e st leve l of a tt e nua ti on a c ro ss t he test fr e que n c ies Cl a ss B prov ides the n e x t hi g he st l e ve l of a tt e nu a ti on a nd C lass C provi de s the le a st attenua ti on 6 CSA R E CO M M E N DE D C L A S S OF HE A R I N G PROTEC TION