Tsom rau PC / PMMMA Sheet thiab kev ua jason@mclsheet.com +86-187 0196 0126
Zoo siab txais tos rau lub ntiaj teb ntawm kev ruaj khov thiab khawb-resistant polycarbonate! Hauv tsab xov xwm no, peb yuav tshawb xyuas qhov zoo kawg ntawm kev ua haujlwm ntawm 1 4 Scratch Resistant Polycarbonate thiab txhua txoj hauv kev uas nws tuaj yeem pab tau koj. Txawm hais tias koj xav tau cov khoom siv ntev ntev rau ib txoj haujlwm tshwj xeeb lossis tsuas yog xav paub ntau ntxiv txog kev hloov tshiab tshiab hauv polycarbonate thev naus laus zis, tsab xov xwm no yuav tsum muaj kev nkag siab zoo. Koom nrog peb thaum peb nthuav tawm ntau qhov zoo ntawm 1 4 Scratch Resistant Polycarbonate thiab vim li cas nws thiaj dhau los ua kev xaiv sab saum toj rau ntau yam kev siv.
Polycarbonate yog cov khoom siv ruaj khov thiab muaj ntau yam uas feem ntau siv rau ntau yam kev siv, los ntawm cov khoom siv tsheb mus rau cov iav tsom iav. Ib qho ntawm cov yam tseem ceeb uas ua rau lub zog ntawm polycarbonate yog nws cov khawb tsis kam. Hauv tsab xov xwm no, peb yuav tshawb txog qhov tseem ceeb ntawm khawb tsis kam hauv polycarbonate, tsom tshwj xeeb rau cov txiaj ntsig ntawm 1 4 khawb-resistant polycarbonate.
Scratch resistance yog ib qho cuab yeej tseem ceeb rau txhua yam khoom uas raug rau cov ntsiab lus lossis raug siv tsis tu ncua. Nyob rau hauv cov ntaub ntawv ntawm polycarbonate, uas yog feem ntau siv nyob rau hauv daim ntawv thov qhov twg nws raug puas thiab hnav, xws li nyob rau hauv kev lag luam automotive los yog nyob rau hauv kev tsim khoom ntawm hluav taws xob, khawb kuj tseem ceeb heev. Tsis tas li ntawd xwb, tej tswvyim pojniam puas nrhiav nrhiav kev los nrhiav kev los nrhiav nrhiav kev li ntawd. Lawv yuav ua li cas?
1 4 khawb-resistant polycarbonate yog ib hom polycarbonate uas tau tsim tshwj xeeb los muab kev txhim kho khawb tsis kam. Qhov no txhais tau hais tias nws muaj peev xwm tiv taus khawb thiab khawb ntau dua li cov qauv polycarbonate, ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov ntawv thov uas siv tau ntev thiab kev ua haujlwm ntev yog qhov tseem ceeb. 1 4 khawb-resistant polycarbonate ua tiav qhov kev khawb zoo tshaj plaws los ntawm kev sib koom ua ke ntawm cov txheej tawv tawv thiab cov khoom ntxiv uas pab txhawb cov khoom siv saum npoo, ua rau nws tiv taus kev puas tsuaj.
Ib qho ntawm cov txiaj ntsig tseem ceeb ntawm 1 4 Kev Tiv Thaiv-Tiv Thaiv Polycarbonate yog nws lub peev xwm los tswj nws cov tsos thiab kev ua tau zoo dhau sijhawm, txawm tias nyob rau hauv cov xwm txheej hnyav. Nyob rau hauv daim ntawv thov xws li tsheb headlights los yog kev tiv thaiv npog rau cov khoom siv hluav taws xob, 1 4 khawb-resistant polycarbonate pab xyuas kom meej tias cov khoom nyob twj ywm meej, pob tshab, thiab tsis muaj khawb tsis pom. Yog li ntawd, tsis yog lub caij ntsiab nrhiav tau nrhiav zoo heev, tiamsis yuav pab tau ib yam li ntawd thiab pab tau lub nroog polycarbonate [ Ntawv]
Ntxiv nrog rau nws cov kev txhim kho khawb tsis kam, 1 4 khawb-resistant polycarbonate kuj muaj tag nrho lwm cov khoom tsim nyog ntawm tus qauv polycarbonate. Qhov no suav nrog kev ua haujlwm siab, zoo heev UV stability, thiab lub teeb yuag thiab yooj yim-rau-kawg xwm. Qhov no ua rau nws muaj ntau yam khoom siv uas tuaj yeem siv rau ntau yam kev siv, los ntawm cov khoom siv tsheb thiab aerospace mus rau cov khoom siv kev nyab xeeb thiab cov khoom siv hluav taws xob.
Hauv kev xaus, khawb tsis kam yog qhov tseem ceeb rau cov khoom siv polycarbonate, tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov uas cov khoom raug hnav thiab puas. 1 4 khawb-resistant polycarbonate muab kev txhim kho khawb tsis kam, ua kom muaj kev ua tau zoo dua qub thiab siv tau ntev hauv ntau yam kev siv. Los ntawm kev xaiv 1 4 khawb-resistant polycarbonate, cov tuam ntxhab thiab cov neeg tsim khoom tuaj yeem ntseeg tau tias lawv cov khoom yuav tuav lawv cov tsos thiab kev ua haujlwm nyob rau lub sijhawm, txawm tias nyob rau hauv kev xav tau. Yog li ntawd, nws yog qhov tseeb tias 1 4 khawb-resistant polycarbonate yog cov khoom siv tseem ceeb rau txhua daim ntawv thov uas muaj zog thiab kev ntseeg siab yog qhov tseem ceeb tshaj plaws.
Thaum nws los txog rau cov khoom siv ruaj thiab khawb-resistant, 1 4 khawb resistant polycarbonate yog ib qho ntawm cov kev xaiv saum toj kawg nkaus rau ntau yam kev siv. Lawv siv tej teeb meeb, aerospace, thiab elektronik. Yog li ntawd, peb yuav tsum nrhiav kev sib raug zoo.
Txhawm rau nkag siab txog kev tshawb fawb tom qab 1 4 khawb resistant polycarbonate, nws yog ib qho tseem ceeb uas yuav tsum xub muaj kev nkag siab yooj yim ntawm polycarbonate yog dab tsi. Polycarbonate yog ib qho thermoplastic polymer uas paub txog nws lub zog zoo kawg thiab kev cuam tshuam tsis zoo. Nws yog feem ntau siv los ua ib qho kev sib tw rau iav vim nws cov khoom tawg-resistant. Thaum ua ke nrog cov coatings-resistant coatings, polycarbonate yuav txawm ntau resilient, ua rau nws yog ib qho kev xaiv zoo tshaj plaws rau cov ntawv thov uas durability yog qhov tseem ceeb.
Lub 1 4 khawb resistant polycarbonate yog tsim tshwj xeeb los tiv thaiv abrasions thiab khawb, ua rau nws yog ib qho kev xaiv nrov rau cov khoom uas raug siv hnyav thiab muaj peev xwm puas tsuaj. Tus yuam sij rau nws txoj kev khawb tiv thaiv cov lus dag nyob rau hauv cov qauv ntawm cov khoom siv thiab cov ntawv thov ntawm cov khoom tshwj xeeb uas tau txhim kho nws cov khoom tiv thaiv.
Ib qho tseem ceeb ntawm 1 4 khawb resistant polycarbonate yog nws hardness. Polycarbonate cov ntaub ntawv raug ntsuas ntawm Rockwell nplai rau hardness, thiab 1 4 khawb resistant variation tshwj xeeb yog tsim los kom muaj ib tug siab hardness ntsuam xyuas, ua rau nws ntau resistant rau khawb thiab abrasions. Qhov hardness no tau ua tiav los ntawm kev sib xyaw ua ke, nrog rau cov tshuaj muaj pes tsawg leeg ntawm polycarbonate thiab ntxiv cov tshuaj ntxiv uas ntxiv dag zog rau cov khoom siv.
Ntxiv rau nws qhov hardness, 1 4 khawb resistant polycarbonate kuj tau txais txiaj ntsig los ntawm kev siv cov txheej tshwj xeeb uas ntxiv dag zog rau nws cov kav ntev. Cov txheej txheem no feem ntau yog tsim los ntawm cov ntaub ntawv tawv, pob tshab uas tsim muaj kev tiv thaiv kev tiv thaiv ntawm polycarbonate nto. Cov txheej txheej no ua raws li cov txheej txheem kev txi, absorbing qhov cuam tshuam ntawm khawb thiab txo qhov kev puas tsuaj rau cov khoom siv polycarbonate.
Cov kev tshawb fawb tom qab cov txheej txheej no yog qhov nyuaj, suav nrog kev xaiv cov khoom siv zoo thiab cov txheej txheem thov kom meej meej kom muaj txheej txheej tiv thaiv zoo. Cov coatings no kuj raug tsim los ua cov tshuaj tiv thaiv thiab ib puag ncig, kom ntseeg tau tias khawb tsis kam ntawm polycarbonate yog khaws cia dhau sijhawm.
Nyob rau hauv xaus, lub durability ntawm 1 4 khawb resistant polycarbonate yog los ntawm ob qho tib si nws cov khoom siv hauv paus thiab kev siv cov txheej tshwj xeeb. Los ntawm kev nkag siab txog kev tshawb fawb tom qab cov khoom siv no, cov neeg tsim khoom thiab cov neeg tsim qauv tuaj yeem txiav txim siab paub txog nws cov kev siv hauv ntau daim ntawv thov, kom ntseeg tau tias cov khoom muaj peev xwm tiv taus qhov kev siv niaj hnub tsis muaj kev cuam tshuam rau khawb thiab puas. Raws li kev siv thev naus laus zis txuas ntxiv mus, peb tuaj yeem cia siab tias yuav pom kev txhim kho ntxiv hauv kev tshawb fawb tom qab 1 4 khawb resistant polycarbonate, ua rau cov khoom muaj zog thiab kav ntev.
Thaum nws los txog rau xaiv cov khoom tsim nyog rau ntau yam kev siv, durability yog qhov tseem ceeb uas yuav tsum tau xav txog. Nyob rau hauv tsab xov xwm no, peb yuav delve rau hauv lub durability ntawm 1 4 khawb resistant polycarbonate thiab muab piv nrog rau lwm yam ntaub ntawv uas feem ntau siv nyob rau hauv txawv industries.
Polycarbonate yog lub teeb yuag thiab ruaj khov cov khoom siv thermoplastic uas paub txog nws qhov kev tiv thaiv siab. Nws yog feem ntau siv rau hauv daim ntawv thov uas yuav tsum tau muaj zog thiab toughness, xws li hauv kev tsim cov iav mos mos, dav hlau canopies, thiab tsom iav kev nyab xeeb. Lub 1 4 scratch resistant polycarbonate, tshwj xeeb, yog tsim los tiv thaiv puas thiab khawb, ua rau nws haum rau siv nyob rau hauv hnyav ib puag ncig.
Thaum muab piv cov kav ntev ntawm 1 4 khawb resistant polycarbonate nrog rau lwm cov ntaub ntawv, nws yog ib qho tseem ceeb uas yuav tau xav txog tej yam xws li kev cuam tshuam, khawb tsis kam, thiab tag nrho lub neej ntev. Ib yam khoom uas feem ntau piv rau polycarbonate yog acrylic. ( Chiv Keeb 3: 1 - 5) Yog li ntawd, ib yam dabtsi npaum li phau ntawv tswv. Qhov no ua rau 1 4 khawb resistant polycarbonate yog ib qho kev xaiv zoo dua rau cov ntawv thov uas xav tau qib siab ntawm kev ua haujlwm ntev.
Lwm cov khoom siv uas feem ntau siv piv rau polycarbonate yog iav. Txawm hais tias iav yog cov khoom siv tawv thiab tawv, nws kuj yog nkig thiab ua rau tawg ntawm qhov cuam tshuam. Nyob rau hauv sib piv, 1 4 khawb resistant polycarbonate yog heev cuam tshuam resistant thiab muaj peev xwm tiv taus hnyav heev tsis tawg los yog tawg. Qhov no ua rau polycarbonate muaj kev nyab xeeb thiab ruaj khov dua rau cov ntawv thov uas muaj kev txhawj xeeb txog kev nyab xeeb.
Ntxiv rau nws qhov kev cuam tshuam tsis zoo, 1 4 khawb resistant polycarbonate kuj muaj kev khawb zoo dua piv rau lwm cov ntaub ntawv xws li acrylic thiab iav. Qhov no yog vim qhov tshwj xeeb txheej siv rau saum npoo ntawm polycarbonate, uas muab kev tiv thaiv tiv thaiv khawb thiab puas. Raws li qhov tshwm sim, polycarbonate tuav nws qhov meej thiab zoo li lub sijhawm, ua rau nws xaiv tau ntev thiab raug nqi rau ntau yam kev siv.
Hauv kev xaus, 1 4 khawb resistant polycarbonate yog cov khoom siv ruaj khov uas muaj kev cuam tshuam zoo thiab khawb tsis zoo piv rau lwm cov ntaub ntawv xws li acrylic thiab iav. Nws muaj peev xwm tiv taus abrasion thiab tswj nws qhov pom tseeb ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov ntawv thov uas qhov kev ua haujlwm ntev yog qhov tseem ceeb tshaj plaws. Txawm hais tias nws yog siv hauv kev tsim cov khoom siv kev nyab xeeb, cov khoom siv hauv tsheb, lossis cov khoom siv hluav taws xob, 1 4 khawb resistant polycarbonate yog cov khoom siv txhim khu kev qha thiab kav ntev uas ua tau raws li qhov xav tau ntawm kev lag luam niaj hnub no.
1/4 khawb resistant polycarbonate yog cov khoom siv ntau yam thiab ruaj khov uas muaj ntau yam kev siv tiag tiag hauv ntiaj teb. Los ntawm cov looj tsom iav tiv thaiv rau cov khoom siv hauv tsheb, hom polycarbonate no nrhiav tau zoo heev rau nws lub zog thiab tiv thaiv kev puas tsuaj. Hauv tsab xov xwm no, peb yuav tshawb txog ntau yam kev siv 1/4 khawb resistant polycarbonate thiab cov txiaj ntsig nws muab rau hauv kev lag luam sib txawv.
Ib qho ntawm cov kev siv ntau tshaj plaws ntawm 1/4 khawb resistant polycarbonate yog nyob rau hauv kev tsim cov looj tsom iav. Kev nyab xeeb tsom iav thiab tsom iav ua los ntawm cov khoom siv no muaj peev xwm tiv taus qhov cuam tshuam thiab tiv thaiv khawb, muab cov neeg ua haujlwm nrog kev tiv thaiv qhov muag zoo hauv qhov chaw muaj kev pheej hmoo siab. Lub durability ntawm 1/4 khawb resistant polycarbonate xyuas kom meej tias cov looj tsom iav tsis zoo txawm tias nyob rau hauv cov xwm txheej hnyav, ua rau nws yog ib qho tseem ceeb hauv kev tsim kho, kev tsim khoom, thiab kev lag luam.
Ntxiv nrog rau cov tsom iav tiv thaiv, 1/4 khawb resistant polycarbonate kuj tau siv dav hauv kev lag luam tsheb. Nws feem ntau yog siv los ua cov khoom siv hauv tsheb xws li lub taub hau npog, ntsuas vaj huam sib luag, thiab cov khoom siv sab hauv. Kev khawb tsis kam ntawm cov khoom siv no ua kom ntseeg tau tias cov khoom no tswj lawv qhov meej thiab pom, txawm tias tom qab siv ntau xyoo. Tsis tas li ntawd, nws qhov kev cuam tshuam siab ua rau nws yog qhov kev xaiv zoo tshaj plaws rau kev txhim kho kev nyab xeeb ntawm lub tsheb, vim nws tuaj yeem tiv taus kev sib tsoo thiab tiv thaiv cov neeg caij tsheb los ntawm kev raug mob.
Lwm qhov tseem ceeb hauv ntiaj teb daim ntawv thov ntawm 1/4 khawb resistant polycarbonate yog nyob rau hauv cov khoom siv hluav taws xob. Cov khoom siv feem ntau yog siv los ua cov ntxaij vab tshaus thiab tso saib panels rau smartphones, ntsiav tshuaj, thiab lwm yam khoom siv tes. Nws cov khoom khawb-tiv taus kom ntseeg tau tias cov ntxaij vab tshaus nyob twj ywm tsis muaj kev puas tsuaj, tswj lawv txoj haujlwm thiab kev zoo nkauj zoo nkauj dua lub sijhawm. Tsis tas li ntawd, qhov ua tau ntev ntawm 1/4 khawb resistant polycarbonate muab kev tiv thaiv ntxiv rau cov khoom siv hluav taws xob zoo nyob hauv cov khoom siv no, txo qhov kev pheej hmoo ntawm kev puas tsuaj los ntawm kev hnav thiab tsim kua muag txhua hnub.
Tsis tas li ntawd, 1/4 khawb resistant polycarbonate kuj tau siv hauv kev tsim kho kev lag luam rau ntau lub hom phiaj. Nws feem ntau yog siv los ua qhov rais, skylights, thiab architectural panels vim nws cuam tshuam tsis kam thiab muaj peev xwm tiv taus huab cua hnyav. Nws cov kev tiv thaiv khawb ua kom ntseeg tau tias cov khoom siv hauv tsev no tswj lawv cov pob tshab thiab pom, thaum nws cov kav ntev muab kev tiv thaiv ntev tiv thaiv kev puas tsuaj thiab tawg. Qhov no ua rau 1/4 khawb resistant polycarbonate yog qhov kev xaiv zoo tshaj plaws rau ob qho tib si hauv vaj tse thiab kev tsim kho kev lag luam.
Hauv kev xaus, kev siv lub ntiaj teb tiag tiag ntawm 1/4 khawb resistant polycarbonate muaj ntau haiv neeg thiab nyob deb. Los ntawm kev tiv thaiv cov tsom iav mus rau cov khoom siv tsheb, cov khoom siv hluav taws xob rau cov khoom siv hauv tsev, kev ua haujlwm ntev thiab khawb tsis kam ntawm cov khoom no ua rau nws muaj txiaj ntsig zoo hauv ntau yam kev lag luam. Nws muaj peev xwm tiv taus qhov cuam tshuam thiab tiv thaiv kev puas tsuaj kom ntseeg tau tias cov khoom tsim los ntawm 1/4 khawb resistant polycarbonate nyob ruaj khov thiab kav ntev, ua rau nws yog ib qho khoom siv rau ntau yam kev siv.
1 4 Scratch Resistant Polycarbonate Cov Khoom lag luam paub txog lawv cov kav ntev thiab lub zog. Cov khoom no tau siv dav hauv ntau yam kev lag luam xws li tsheb, aerospace, thiab kev tsim kho vim lawv cov khoom khawb-resistant. Txawm li cas los xij, txhawm rau tswj xyuas qhov ua tau zoo thiab ua haujlwm ntev ntawm cov khoom no, kev saib xyuas kom zoo thiab kev saib xyuas yog qhov tseem ceeb. Hauv tsab xov xwm no, peb yuav muab qee cov lus qhia tseem ceeb rau kev saib xyuas thiab saib xyuas 1 4 Scratch Resistant Polycarbonate khoom.
Ua ntej thiab qhov tseem ceeb, nws yog ib qho tseem ceeb kom nkag siab txog cov khoom ntawm 1 4 Scratch Resistant Polycarbonate. Cov khoom siv no paub txog nws qhov kev tiv thaiv siab thiab khawb tsis kam, ua rau nws zoo tagnrho rau cov ntawv thov uas muaj qhov ntev yog qhov tseem ceeb. Txawm li cas los xij, txawm hais tias nws muaj zog ua haujlwm tau zoo, 1 4 Scratch Resistant Polycarbonate tsis muaj zog tiv thaiv kev puas tsuaj. Yog li ntawd, kev saib xyuas thiab kev saib xyuas kom zoo yog qhov tsim nyog los xyuas kom meej lub neej ntev ntawm cov khoom no.
Ib qho ntawm cov lus qhia tseem ceeb tshaj plaws rau kev tswj hwm 1 4 Scratch Resistant Polycarbonate Cov Khoom yog ua kom huv si tsis tu ncua nrog xab npum me me thiab dej. Qhov no yuav pab tshem tawm cov av, grime, lossis lwm yam khib nyiab uas tuaj yeem sib sau rau ntawm qhov chaw ntawm cov khoom. Nws yog ib qho tseem ceeb kom tsis txhob siv cov tshuaj tua kab mob hnyav lossis cov tshuaj abrasive, vim tias cov no tuaj yeem ua rau cov kab mob khawb-resistant txheej ntawm polycarbonate.
Ntxiv nrog rau kev tu tsis tu ncua, nws tseem ceeb heev kom tsis txhob siv cov khoom ntse lossis cov khoom abrasive ntawm 1 4 Scratch Resistant Polycarbonate Cov Khoom. Thaum cov txheej khawb-tiv taus muab kev tiv thaiv qib siab, nws tseem ua tau rau cov khoom siv los ua khawb yog tias nws los rau hauv kev sib cuag nrog cov khoom ntse lossis abrasive. Yog li ntawd, nws yog ib qho tseem ceeb los tswj cov khoom no nrog kev saib xyuas thiab tsis txhob muaj qhov tsis tsim nyog roughness.
Lwm qhov tseem ceeb ntawm kev tswj hwm 1 4 Scratch Resistant Polycarbonate Cov Khoom yog khaws cia kom zoo thaum tsis siv. Kev khaws cia zoo tuaj yeem pab tiv thaiv kev puas tsuaj rau cov khoom siv thiab ua kom nws lub neej ntev. Nws raug nquahu kom khaws cov khoom no rau hauv qhov chaw txias, qhuav kom deb ntawm tshav ntuj ncaj qha thiab qhov kub thiab txias. Khaws cia rau hauv cov ntaub ntawv padded los yog qhwv lawv hauv cov ntaub mos kuj tuaj yeem pab tiv thaiv lawv ntawm khawb thiab lwm yam kev puas tsuaj.
Ntxiv nrog rau cov lus qhia no, nws yog ib qho tseem ceeb uas yuav tsum tau kuaj xyuas 1 4 Scratch Resistant Polycarbonate Cov khoom tsis tu ncua rau txhua yam kev puas tsuaj lossis hnav. Yog tias pom muaj khawb lossis lwm yam kev puas tsuaj, nws yog ib qho tseem ceeb uas yuav tsum tau hais rau lawv tam sim ntawd kom tsis txhob muaj kev puas tsuaj ntxiv ntawm cov khoom. Nyob ntawm qhov hnyav ntawm qhov kev puas tsuaj, nws tuaj yeem ua rau cov khawb me me uas siv cov polishing compound tshwj xeeb tsim rau cov ntaub ntawv polycarbonate. Txawm li cas los xij, rau kev puas tsuaj loj dua, nws yuav tsum tau nrhiav kev kho lossis hloov kho.
Hauv kev xaus, 1 4 Scratch Resistant Polycarbonate Cov khoom yog cov khoom siv ruaj khov thiab muaj zog uas tau siv dav hauv ntau yam lag luam. Txawm li cas los xij, kev saib xyuas thiab kev saib xyuas kom zoo yog qhov tseem ceeb los xyuas kom lub neej ntev ntawm cov khoom no. Los ntawm kev ua raws li cov lus qhia tau hais hauv tsab xov xwm no, cov tib neeg tuaj yeem siv cov kev tiv thaiv zoo los tswj thiab saib xyuas 1 4 Scratch Resistant Polycarbonate Cov Khoom, thaum kawg ua rau lawv lub neej ntev thiab khaws lawv cov khoom khawb-tiv taus.
Nyob rau hauv xaus, lub durability ntawm 1 4 khawb resistant polycarbonate yog tiag tiag impressive. Nws muaj peev xwm tiv taus khawb thiab tuav nws lub zog thiab pom tseeb ua rau nws muaj txiaj ntsig zoo rau ntau yam kev siv. Txawm hais tias siv hauv tsheb, vaj tsev, lossis chaw tsim khoom, cov polycarbonate no muaj kev ua tau zoo tshwj xeeb thiab ua haujlwm ntev. Nws resilience tiv thaiv abrasion thiab hnav ua kom ntseeg tau tias nws yuav zoo mus ntxiv thiab ua tau zoo nyob rau lub sijhawm. Nrog rau ntau cov txiaj ntsig, nws tsis xav tias 1 4 khawb resistant polycarbonate yog ib qho kev xaiv zoo tshaj plaws rau cov tuam ntxhab thiab cov neeg tsim qauv zoo ib yam. Yog li yog tias koj nyob hauv kev ua lag luam rau cov khoom siv ruaj khov thiab txhim khu kev qha, saib tsis pub dhau 1 4 khawb resistant polycarbonate.