- D4 (Octamethylcyclotetrasiloxane) D4

- D5 (Decamethylcyclopentasiloxane) D5

D6 (Dodecamethylcyclohexasiloxane) D6

Ƙuntatawa na D4 da D5 a cikin Kayayyakin Kulawa na Keɓaɓɓu:

OctamethylcyclotetrasiloxaneD4da decamethylcyclopentasiloxaneD5) an ƙara zuwaKA SANYA jerin abubuwan ƙuntatawa na XVII(shigar ta 70) taHUKUNCIN HUKUMAR (EU) 2018/35kan10 Janairu 2018. Ba za a sanya D4 da D5 a kasuwa a cikin kayan kwalliyar da aka wanke ba a cikin maida hankali daidai ko sama da haka.0.1%da nauyin kowane abu, bayan31 ga Janairu, 2020.

Me yasa D4 da D5 Aka Ƙuntata?

D4 da D5 su ne cyclosiloxanes da aka fi amfani da su azaman monomers don samar da polymer silicone. Hakanan suna da amfani kai tsaye a cikin samfuran kulawa na sirri. An gano D4 azaman am, bioaccumulative da mai guba (PBT) da sosai naci sosai bioaccumulative (vPvB) abu. An gano D5 azaman abun vPvB.

Saboda damuwa cewa D4 da D5 na iya samun yuwuwar tarawa a cikin mahalli da haifar da tasirin da ba za a iya tsinkaya ba kuma ba za a iya juyawa ba a cikin dogon lokaci, Ƙimar Haɗarin ECHA (RAC) da Tattalin Arziki na zamantakewaKwamitocin tantancewa (SEAC) sun amince da shawarar Burtaniya na takaita D4 da D5 a cikin kayayyakin kulawa na mutum a watan Yuni 2016 tunda suna iya gangarowa cikin magudanar ruwa su shiga tafkuna, koguna, da tekuna.

Ƙuntataccen Amfani da D4 da D5 a Wasu Samfura?

Ya zuwa yanzu D4 da D5 ba su da ƙuntatawa a wasu samfuran. ECHA tana aiki akan ƙarin tsari don taƙaita D4 da D5 a cikibar kan samfuran kulawa na sirrida sauran sumabukaci/kayan sana'a(misali busassun bushewa, kakin zuma da goge goge, kayan wanke-wanke da tsaftacewa). Za a gabatar da shawarar don amincewa a cikiAfrilu 2018. Masana'antu sun nuna rashin amincewarsu da wannan ƙarin ƙuntatawa.

A cikiMaris 2018, ECHA kuma ta ba da shawarar ƙara D4 da D5 zuwa jerin SVHC.

Magana:

• HUKUNCIN HUKUMAR (EU) 2018/35
• Kwamitin Nazarin Hatsari (RAC) Ya Amince da Shawarwari don Ƙuntata D4 da D5 Amfani a ciki
• Kayan shafawa na wanke-wanke
• Nufin Ƙuntatawar D4 da D5 a cikin Wasu Samfura
• Slicones Turai - Ƙarin ƙuntatawa na REACH na D4 da D5 sun riga sun kasance kuma ba su da hujja - Yuni 2017

Menene silicones?

Silicones samfura ne na musamman waɗanda ake amfani da su a ɗaruruwan aikace-aikace inda ake buƙatar aikinsu na musamman. Ana amfani da su azaman adhesives, suna rufewa, kuma suna da kyakkyawan juriya na inji / gani / thermal a tsakanin sauran kaddarorin da yawa. Ana amfani da su, alal misali, a cikin fasahar likitanci, makamashi mai sabuntawa da hanyoyin ceton makamashi, da kuma fasahar dijital, gini da sufuri.

Menene D4, D5 da D6 kuma a ina ake amfani da su?

Ana amfani da Octamethylcyclotetrasiloxane (D4), Decamethylcyclopentasiloxane (D5) da Dodecamethylcyclohexasiloxane (D6) don ƙirƙirar nau'ikan kayan silicone daban-daban waɗanda ke ba da halaye na musamman, masu fa'ida ga nau'ikan aikace-aikace da samfura iri-iri a cikin sassan, gami da gini, lantarki, injiniyanci, kiwon lafiya. , kayan shafawa da kulawa na sirri.

D4, D5 da D6 ana amfani dasu akai-akai azaman matsakaicin sinadarai, ma'ana ana amfani da abubuwan a cikin tsarin masana'antu amma suna kasancewa kawai azaman ƙazantattun ƙazanta a ƙarshen samfuran.

Menene ma'anar SVHC?

SVHC na nufin "Abubuwan da ke da matukar damuwa".

Wanene ya yanke shawarar SVHC?

Kwamitin Kasashe na ECHA (MSC) ne ya yanke shawarar bayyana D4, D5, D6 a matsayin SVHC, wanda ya kunshi kwararrun da kasashe mambobin EU da ECHA suka zaba.

An bukaci mambobin MSC su sake duba bayanan fasaha da Jamus ta gabatar don D4 da D5, da kuma ta EHA don D6, da kuma maganganun da aka samu yayin shawarwarin jama'a.

Manufar waɗannan ƙwararrun ita ce tantancewa da tabbatar da tushen kimiyya da ke ƙarƙashin shawarwarin SVHC, ba don tantance tasirin da zai iya yi ba.

Me yasa aka jera D4, D5 da D6 azaman SVHC?

Dangane da ka'idodin da aka yi amfani da su a cikin REACH, D4 ya cika ka'idodin abubuwan da ke dagewa, Bioaccumulative da Toxic (PBT), kuma D5 da D6 sun cika ma'auni don abubuwan da ke dagewa sosai, sosai Bioaccumulative (vPvB).

Bugu da ƙari, ana ɗaukar D5 da D6 PBT lokacin da suka ƙunshi fiye da 0.1% D4.

Wannan ya haifar da nadin da ƙasashe membobin EU suka yi zuwa jerin SVHCs. Koyaya, mun yi imanin ka'idodin ba su ƙyale cikakken kewayon shaidar kimiyya da suka dace da yin la'akari da su ba.