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 2 11 of 53 8 I so c y a na t e s a r e use d in l iqui d for m or diss olved in other li quids The y h a ve a sha rp f ruit y odo r but most pe ople c a nnot s mell t he odor unti l t he a mount of the c he mi c a l i n the a ir is fa r a bov e sa f e leve ls 50 REG ULATI ON AN D S T AN DA RD S P E R P R O VIN CE The Ame ric a n C onfe r e nc e of G ove rnme ntal I ndus tria l H y gienist s A C G I H re c o g niz e s 0005 ppm a s it s thre shol d li mi t value T L V a s a n e ig ht hour ti me we ig ht e d a ve ra g e a nd 00 2 ppm as a short ter m e x posure li mi t S TEL fo r T D I MD I a nd HD I Upon re f e re n c ing a ll pro vincia l re g ulator y bodies B e lt e r ra will int roduc e t he mi nim um t hre shol d li mi t va lue T L V a nd short te rm e x posure li mi t S TEL thus pr ovidi ng a pp ropr iate pe rsona l prot e c ti ve e quipm e nt t o our e mpl o y e e s a nd indi viduals wor k ing a roun d th is ar e a s a fe a s following Age nt C AS No Time W e ig hted Ave ra ge L im it TW A S hort Te rm Ex posure L im it S TE L C e il ing L im it C I so c y a na t e s or g a nic c om pounds 0005 ppm C 001 ppm Tolue ne dii soc y a na t e T D I 584 84 9 91 08 7 0005 ppm C 001 ppm Me th y len e bisph e n y l i soc y a na te MD I 101 68 8 0005 ppm C 001 ppm He x a meth y len e dii soc y a na te HD I 822 06 0 0005 ppm C 001 ppm I sopho rone dii soc y a n a te I P D I 4098 71 9 0005 ppm C 001 ppm Me th y len e bis 4 c y c lohe x y li soc y a n a te 5124 30 1 0005 ppm C 001 ppm Doc u m e n t Identif icat ion S E L 027 P age Nu m b e r 3 of 8 Doc u m e n t C r e ation Dat e J a nua r y 1 2013 Im p le m e n tat ion Dat e F e bru a r y 18 2014 60 HE ALT H E F F E CTS I so c y a na t e s a r e ve r y re a c ti ve thus the y a re ve r y ir rita ti ng to t he ski n e y e s nose a nd lun g s Ac ute e x posure usua ll y sing le dose hi g h c on c e n tra ti on e x posure s ove r a s hort pe riod of ti me T his ca n oc c ur f rom a n une x pe c te d or a c c id e ntal spi ll of the li quid che mi c a ls or r e le a se of hi g h c on c e ntra ti on s of va pors Spl a she s of isoc y a na tes dire c tl y on th e ski n or e y e s c a use a s e ve r e i nfla mm a tor y re a c ti on produ c in g pa in re dn e ss a nd swe ll ing C hronic e x posure R e pe a ted e x posure a t l ow c on c e ntra ti ons ove r a l on g p e riod of ti me w il l af f e c t t he skin and lung s a s in a c ute e x posure s but the s y m ptom s a nd si g ns m a y be diff e re nt S e nsit iz a ti on c a use s sensit iz a ti on of the skin or re spira tor y s y stem S kin ra she s ma y a p pe a r a nd w il l g o a wa y onc e e x posure to i soc y a na tes stops On c e so meone ha s be c ome se nsit iz e d of the re spira tor y s y stem t he y ma y d e ve lo p a sthm a ti c re a c ti ons t o e x tre mel y low c onc e ntra ti ons of isoc y a na tes b e low the e x posure li mi ts C a nc e r S tudi e s show th a t ex posure to i soc y a n a te s doe s not incr e a s e the r i sk of c a nc e r