US Environmental Protection Agency (EPA) chuan solvent leh processing aid hman tlanglawn tak, dichloromethane, dichloromethane tia hriat bawk, ​​hmanna zawng zawng deuhthaw khap a rawt a ni. Khap tura ruahmanna siam hian industry tam takah nghawng lian tak a nei dawn a, kum 2019 chhung hian chemical pound maktaduai 100 leh 250 inkar siam chhuah emaw lakluh emaw a ni dawn a, hmanna tlemte, HFC-32 siamna atana reagent atana hman te pawh tiamin, tuna OSHA standard aiin khapna khauh zawk a awm dawn a ni.
EPA chuan khapna leh khapna siam tura ruahmanna siam hi May 3, 2023-a posted rule-ah a puang a, 83 Fed. inziaklut. 28284. He rawtna hian consumer dang zawng zawng dichloromethane hman khap a ni ang. Dichloromethane hi industry leh sumdawnna atana hman eng pawh, heat transfer fluid emaw, process aid dang emaw atan pawh, solvent atana hman tam zawk pawh khap a ni ang a, hmanna bik sawm tih loh chu, chung zinga pahnih chu specialized tak a ni. He warning tawp lamah hian hman khap leh hman lohte tarlan a ni. Nakin lawkah hman dan thar pawimawh tak takte chuan list-a tel lo hmannate a huam thei ang.
Khapnain a huam loh hmanna sawmte hian methylene chloride atana OSHA standard hmanga Workplace Chemical Protection Plan (WCPP) kalpui a ngai dawn a, mahse chemical exposure limit awmsa chu OSHA-in a phal aia 92% a hniam zawk a ni.
Rule siam tum chungchangah hian ngaihven duhte chuan July 3, 2023 thleng ngaihdan an thehlut thei a ni. EPA chuan thupui 44-ah ngaihdan a dil a, chung zingah chuan WCPP requirement hian specific use ban thlak a ngai em tih leh accelerated ban schedule siam theih a nih leh nih loh te pawh a tel. EPA chuan hman khap eng emaw zat chu hmanraw pawimawh emaw, hmanraw pawimawh emaw anga ngaih theih a nih leh nih loh chungchangah ngaihdan a dil bawk a, hei hi a him zawk tur dang a awm loh avangin.
He rawtna hi EPA-in Toxic Substances Control Act (TSCA) Section 6 hnuaia risk assessment neih theih chemical pawimawh sawm atana a rawt pahnihna a ni. Pakhatnaah chuan hei hi chrysotile hmanna dang zawng zawng khap tura rawtna a ni. Rule pathumna hi perchloroethylene chungchang a ni a, February 23, 2023 atang khan Office of Management and Budget (OMB) chuan a enfiah mek a, March 20, 2023 thleng khan chrysotile atana dan hnuhnung ber draft (kan vaukhânna en rawh) chu OMB-in a enfiah mek a ni.
June 2020-a risk assessment-ah chuan methylene chloride hmanna condition paruk tih lohah chuan risk dik lo a awm tih hmuhchhuah a ni. Tunah chuan paruk chu WCPP thil phut hnuaia hman tur terms of use list-ah an lang vek tawh a ni. November 2022-a risk tih awmzia siam\hat a nih dan chuan dichloromethane hian a pumpuiah risk a nei lo tih a tarlang a, hman dan tur pakhat chauh (commercial distribution) chu sawifiahna nena inzawm lo a ni. Khap tura ruahmanna siamah hian khapna atana sumdawnna atana sem chhuah a tel dawn a, mahse WCPP zawm tur hmanna atan erawh a huam lo ang. Dichloromethane hian hlauhawm lo tak a thlen tih hmuhchhuah a nih hnuah, tunah chuan TSCA Section 6(a) chuan EPA chuan chutiang hlauhawmna a thlen tawh loh nan chemical chu a tul angin risk management rules siam turin a ti ta a ni.
EPA chuan a hmain consumer-te chu paint leh coatings paih nan methylene chloride hman a khap tawh a, 40 CFR § 751.105. Tunah hian EPA chuan section 751.105-in a huam loh consumer use zawng zawng khap a rawt mek a, heng zingah hian methylene chloride leh heng thil atan hian methylene chloride awmna thil siam, siam, leh sumdawnna atana sem chhuah te pawh a tel a ni.
Hei bakah hian EPA chuan WCPP-in a phut loh dichloromethane industry leh sumdawnna atana hman zawng zawng khap a rawt a, chung zingah chuan siam chhuah, siam, sumdawnna atana sem, leh heng hman dan tur hnuaia hman te pawh a tel a ni.
He vaukhânna tawp lamah hian industrial, commercial, leh consumer condition 45, khap tura rawtna awmte tarlan a ni. He list hi kum 2020 Risk Assessment atanga lak a ni. Hei bakah hian EPA chuan Significant New Use Regulation (SNUR) siam a tum a, hei hi risk assessment-a tel lo dichloromethane emaw, dichloromethane awmna thil emaw-ah hman a ni ang. January thlaa regulatory agenda tihchhuahah chuan April 2023-ah SNUR ruahman (EPA chuan chu ni chu a pelh tawh) leh March 2024-ah SNUR hnuhnung ber siam a nih tur thu a sawi.
EPA chuan he khapna hian kum khata methylene chloride siam chhuah zawng zawng emaw, TSCA leh hmanna dang atana lakluh zawng zawng hmun thuma ṭhena hmun khat vel a tling dawn niin a chhut.
[T]he ruahmanna siam hi TSCA Section 3(2)(B)(ii)-(vi) hnuaia “chemical” tih awmzia atanga paih chhuah thil eng pawhah hman a ni lovang. Heng paih chhuah te hian a huam a, mahse a huam chin erawh a ni lo... ei leh in, ei leh in supplement, damdawi, cosmetic, emaw device eng pawh, Federal Food, Drug, and Cosmetic Act Section 201-a tarlan angin, sumdawnna atana siam, siam, emaw sem chhuah a nih chuan. . ei leh in, dietary supplement, damdawi, cosmetics emaw hmanruaah hman tur...
Damdawi atana hman tur battery siamna atana adhesives chungchangah chuan, Federal Food, Drug, and Cosmetic Act section 201(h)-a tarlan angin, “devices” anga tling thei hmanna tarlan te chu “chemical” tih awmzia a\angin paih chhuah a ni ang a, chuvangin a dang a nih chuan regulation hnuaiah a awm lo vang changkang.
Damdawi siamna kawngah closed system-a functional liquid anga dichloromethane hman tur chuan damdawi tihthianghlimnaah extraction solvent atan hman a ngai a, [EPA] chuan he hmanna hi a chunga hrilhfiahnate atanga exceptions hnuaiah a tla a, TSCA-in a sawi dan chuan “chemical” a ni lo tih a thutlukna siam a ni.
Methylene chloride leh methylene chloride awmna thil dahkhawm khaptu incentive khap. EPA chuan hun pek belh a ngai em tih chungchangah ngaihdan a dil a, entirnan, thil khap tawhte distribution channel tihfai nan. Tuna comment dilna hi ngaihtuah chuan EPA hian hun dangah extension dilna ngaihtuah a duh lo mai thei.
45 Prohibited Use Conditions-in a tarlan angin methylene chloride hi industry tam takah hman a ni a, solvent atan leh processing aid atan pawh hman a ni. Chuvang chuan he ruahmanna hi tihfel a nih chuan industry tam tak a nghawng dawn a ni. Kum 2020 Risk Assessment-ah hian hman dan tur thenkhat tarlan a ni a:
Dichloromethane hian hmanna hrang hrang a nei a, sealant, automotive products, leh paint leh coating remover te pawh a awm. Dichloromethane hi paint thinner-ah te leh damdawi leh film coating application-ah te process solvent anga hriat lar tak a ni. Polyurethane atana blowing agent atan leh hydrofluorocarbon (HFC) refrigerant HFC-32 siamnaah te hman a ni. Electronics siamna atana hman, metal tihfai leh degreasing, furniture finishing-a hman thin aerosol propellants leh solvent-ah te pawh a awm bawk.
Methylene chloride hman tam zawk khap theihna tur ruahmanna hian a danglamna awm thei chungchangah zawhna lian tak a siam a ni. EPA hian he thu hi a ngaihtuah hian a danglamna tur a ngaihtuah a, chungte chu thuhmahruaiah hetiang hian tarlan a ni:
Tuna methylene chloride awmna thil siamte hman dan tur hriat chian nan EPA chuan sumdawnna lama hmuh theih non-methylene chloride alternative za tam tak a hmuchhuak a, a theih ang angin an chemical composition emaw ingredient danglam bikte chu Alternatives Assessment-ah a tarlang bawk. .
EPA chuan paint leh coating remover category-ah hian product dang 65 a hmuchhuak a, chung zingah chuan furniture finishing chu subcategory a ni (ref. 48). Economic analysis-a kan hmuh tawh angin, heng thil dang zawng zawng hi furniture siamthatna hmanna thenkhat atana thil tum bik atan a tha vek lo thei a, mahse, mechanical emaw thermal emaw hman dan erawh chu paint leh coating lakchhuahna atana methylene chloride awmna thil hman ai chuan chemical ni lo thil dang a ni thei. ... ...EPA chuan technical leh economically-a hman theih tur dang a awm niin a ngai...
[A] Methylene chloride aia hmanraw dang, processing aids anga hriat loh. EPA chuan he Inremna hnuaia control option ruahmante nena inzawm a nih avangin methylene chloride processing aids aia hmanraw dang awm thei chungchangah thu a dil a ni.
Adjunct atana hman theih tur alternative hriat chhuah a awm loh avangin harsatna awm thei a ni. EPA chuan hman dan tur chu hetiang hian a sawi:
Process emaw process hmanrua emaw hnathawh thatna tura industrial emaw commercial emawa dichloromethane hman emaw, process emaw, thil emaw, thil emaw, thil emaw, thil inzawmkhawm pH tihdanglam emaw, buffer emaw tura tihfai tur thil emaw, thil emaw, tihfai tur emawa dichloromethane dah a nih chuan. Treating agent chu reaction product-ah a tel lo va, a chhuak substance emaw article emaw hnathawh pawh a nghawng lo.
Dichloromethane hi “process additive” atan hman a ni a, closed system-ah heat transfer medium atan hman a ni. Rule siam tum hian dichloromethane hi a exposure theihna a tlem hle chung pawhin he hman hi khap a ni bawk ang. Mahse, thuhmahruaiah chuan heti hian a sawi belh leh a ni.
EPA chuan methylene chloride chu processing aid atana hmangtu pawl dangte chuan methylene chloride atana WCPP-in a phut tur ruahman chu eng chen nge an zawm dawn tih chungchangah ngaihdan a dil a ni. Organization engemaw zatin monitoring data leh process descriptions inzawmkhawm hmanga methylene chloride hman chhunzawm zel hian hnathawkte chu hlauhawm lo takah a thlen lo tih an lantir thei a nih chuan, EPA chuan WCPP angin condition [eg heat transfer medium atana hman] emaw, hman dan tlangpui [processing aid atan] emaw chu chhunzawm zel theihna tur regulation siam a duh thu a nemnghet a ni.
Chutiang chuan, heat transfer fluid ang chi, impact potential hniam tak nei application-a methylene chloride hmangtu company-te chuan EPA hnenah chutiang hman khap tura ruahmanna siam chu WCPP kalpui a ngai tih thlak danglam turin an ngen thei a ni—a hnuaia kan sawiho WCCP thil phut te hi an zawm thei tih EPA hnenah an lantir theih phawt chuan. Environmental Protection Agency chuan hetiang hian a sawi bawk.
EPA chuan he hman dan tur dang a hriat theih loh a, EPA-in WCPP-in a chhan awm lo risk a tihbo tih a hriat theihna turin thu belhchian dawl zawk a pe lo a nih chuan Appropriate Disposition.
Section 6(d) chuan EPA chuan a rang thei ang bera zawm a ngai a, mahse final rule tihchhuah a nih atanga kum 5 aia tlai lovah a zawm tur a ni. Phên dangin sawi ila, chutiang hmanna chuan compliance period pawhsei theihna a tling thei a ni.
A hnuaia hman dan tur condition sawm tarlan te, HFC-32 siam chhuahna atana siam leh tihfai te, recycling leh paih te te tan hian EPA chuan khapna ai chuan Workplace Exposure Controls (ie WCPP) a rawt a ni. Control measures-ah hian exposure limits, controlled areas, exposure monitoring (laboratory practice tha angin monitoring mamawh thar te pawh tel), compliance practices, thawkna lama venhimna, vun venhimna, leh zirtirna te a tel a ni. Heng dan siamte hian OSHA methylene chloride standard 29 CFR § 1910.1052 chu a tihpun a, mahse a tam zawk chu chu standard-ah chuan inthlak danglamna pawimawh tak pakhat nen a innghat a ni.
OSHA standard (a tir chuan kum 1997-a hman) chuan Permissible Exposure Limit (PEL) 25 ppm (darkar 8 chhunga time-weighted average (TWA)) leh Short Term Exposure Limit (STEL) 125 ppm (minute 15 chhunga TWA) a nei a ni. Chumi nena khaikhin chuan tuna TSCA Chemical Exposure Limit (ECEL) chu 2 ppm (8 hour TWA) a ni a, STEL chu 16 ppm (15 minute TWA) a ni. Chuvangin ECEL hi OSHA PEL atanga 8% chauh a ni a, EPA STEL chu OSHA STEL atanga 12.8% a ni ang. Control level hi ECEL leh STEL angin hman tur a ni a, technical control hi ngaih pawimawh hmasak ber tur a ni a, mimal invenna hmanrua hman hi a tawp ber tur a ni.
Hei hian mimal OSHA thil phut zawmtute chuan ECEL leh STEL rawtna an tlin lo thei tihna a ni. Heng exposure limits te hi a tlin theih dan rinhlelhna hi EPA-in industrial leh commercial-a hman tam zawk methylene chloride leh methylene chloride awmna thil siam khaptu a ni.
Manufacturing leh processing hman dan tarlan bakah hian WCPP thupekte hi methylene chloride leh methylene chloride awmna thil paih leh siam danah pawh hman a ni. Chuvang chuan bawlhhlawh paihna company leh recycler-te chuan TSCA thil phut hre lo mai thei te chuan OSHA standard kal pelh a ngai dawn a ni.
Khapna siam tumna zau zawng leh user industry-te'n a nghawng theih zat ngaihtuah chuan he dan siam tura ruahmanna siam chungchangah hian ngaihdan siam hi a hma aia pawimawh zawk a ni mai thei. Comment hi July 3, 2023 hmain EPA hnenah thehluh a ni ang a, Preamble chuan pawl hrang hrangte chu June 2, 2023 hmain paperwork mamawh chungchangah OMB-ah direct-a ngaihdan thehlut turin a rawt a ni.
Comment kan pek hmain company leh trade association (an member-te ngaihdan a\angin) chuan a hnuaia mite hi ngaihtuah hmasak an duh mai thei:
Commentator-te chuan methylene chloride an hman dan te, exposure tihtlem nan an engineering control te, tuna OSHA methylene chloride compliance program te, methylene chloride industrial hygiene monitoring result (leh ECEL vs. STEL tehkhin dan nen a khaikhin dan) te chipchiar takin an sawi duh mai thei. ; an hmanna tur methylene chloride aiah thil dang hriatchhuah emaw, thlak emaw nena inzawm technical harsatna; thil dang (a theih chuan) lama an inthlak theih hun tur; leh methylene chloride an hman pawimawhzia te a sawi bawk.
Chutiang thusawi chuan a hmanna atana compliance period pawhsei chu a thlawp thei a, a nih loh leh EPA-in methylene chloride hmanna ṭhenkhat chu TSCA Section 6(g) hnuaia khapna aṭanga chhuahtir a phut chu a thlawp thei bawk. Section 6(g)(1)-ah chuan:
Administrator chuan chu chu a hmuh chuan...
(A) hmanna tarlante chu hmanraw pawimawh tak emaw, hmanraw pawimawh tak emaw, technical leh economically-a hman theih tur him zawk awm lo, hlauhawm leh nghawngte ngaihtuah chungin
(B) hman dan tur bik atana hman tur thil tul zawm chuan ram economy, ram venhimna, emaw infrastructure pawimawh tak takte nasa takin a tibuai thei a emaw
(C) Chemical emaw, mixture emaw hman dan tur tarlan te hian hriselna, boruak emaw mipui himna atana hlawkna nasa tak a pe a, chu chu a remchan dan anga hman theih dang nena khaikhin chuan a ni.
Administrator-in exemption thil tum a tlin ruala hriselna leh boruak humhalhna atana heng condition te hi a tul tih a hriat phawt chuan, record vawn, enfiah leh report pek ngai te pawh telh tur a ni.
Thuhmahruaiah chuan EPA chuan Section 6(g) chu tihbo a ngaihtuah dawn tih a sawi a, a danglamna tur awm lo leh WCPP thil phut tihhlawhtlin theih a nih loh chuan:
A dang pawhin, EPA chuan he hman dan tur [heat transfer medium angin] a danglamna tur a ruat thei lo a, thu thar atanga EPA chuan hman khapna hian ram venhimna emaw infrastructure pawimawh tak emaw a nghawng nasa hle dawn tih a rel a nih chuan, Agency The EPA chuan TSCA Section 6(g) exemption chu a enfiah leh ang.
Commentator-te chuan WCPP thil phut an tlin theih leh theih loh an tarlang thei a, a tlin loh chuan eng limiting exposure requirement nge an tlin theih tih an tarlang thei bawk.
Disclaimer: He update hi a tlangpui a nih avangin hetia thu tarlan te hi thil awmdan zawng zawngah hman theih a ni lo thei a, i dinhmun bik atanga dan anga thurawn bik pek loh chuan tih tur a ni lo.
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