PTFE na fכm fכ in kεmikכl inεtnɛs – dεn kin kכl am di 'King of Plastics.' I de rεsist kכlכsכl כl di asid, alkali, εn sכlvεnt dεm na rum tεmprachכ. Bɔt, 'klose to ɔl' nɔto 'ɔl.' Ɔnda ekstrim kɔndishɔn – ay tɛmpracha, ay kɔnsɛntreshɔn, ɔ insay mɔlt stet – sɔm kemikal dɛn kin atak PTFE. Ɛn ivin we PTFE insɛf de liv, di ɔndalayn fayv glas sabstret kin bi vulnerable if di kɔtin gɛt difrɛns.
Fɔ ɔndastand dɛn limit ya impɔtant fɔ pik PTFE fabrik na harsh kemikal ɛnvayrɔmɛnt.
Aokai PTFE dɔn tɛst PTFE-kɔt fabrik dɛn agens agresiv kemikal dɛn. Dis gayd de ɛksplen wetin de kɔrɛkt PTFE dairekt wan, wetin de atak di fayv glas sabstret, ɛn aw fɔ avɔyd fɔ mek i nɔ wok.
Aw Kɔrɛshɔn De Apin – Tu Mɛkanism
PTFE ay-tɛmpracha fabrik gɛt tu pat: wan PTFE kɔtin (tin, nɔ stik, kemikal inɛt) ɛn wan fayv glas sabstret (de gi trɛnk bɔt i kin ambɔg sɔm kemikal dɛn). Kɔrɛshɔn kin apin tu we dɛn:
1. Dairekt eroshɔn fɔ di PTFE kɔtin
dis kin apin כnli כnda ekstrim kכndishכn – hכy tεmprachכ, hכy kכnsantreshכn, כ insay di mכlt stet. na rum tεmprachכ, PTFE kin rili imyun fכ dayrekt kεmikכl atak.
2. Kɔrɛshɔn pan di fayv glas sabstret tru kɔtin dɛfɛkt
Kεmikכl dεm de go insay di pinhol dεm, skrach dεm, כ maykro-krak dεm na di PTFE kכt εn atak di glas fayv dεm. Di PTFE insɛf kin stil luk fayn, bɔt di klos kin lɔs di mɛkanikal trɛnk ɛn i kin te izi wan. Dis na kɔmɔn fayl mɔd we di kɔtin dɔn pwɛl.
Sɔdiɔm (Na), potashɔm (K), ɛn litiɔm (Li) we dɔn mɔlt de pul di fluorine atɔm dɛn frɔm PTFE, we de mek di kabɔnayzeshɔn, blak kɔlɔ chenj, ɛn pauda na di matirial sɔfays. di sodium-naphthalene solushכn we dεn yuz fכ PTFE etch de wok pan dis prinsipul.
Efεkt: Komplit dεstrukshכn כf PTFE strכkchכ.
di kondishכn dεm: εni we dεn εkspos to mכlt alkali mεtal dεm (abov dεn mεlt pכynt dεm, fכ egzampl, Na na 98°C).
Di tin we yu fɔ du: Nɔ du am ɔltogɛda. Yuz pure PTFE film nɔmɔ if i rili nid fɔ du am, ɛn ivin da tɛm de wit kɔt.
2. Strɔng fluorinating ejen dɛn na ay tɛmpracha
Dɛn tin ya kin mek PTFE rɔtin mɔ ɔnda ay ɔt:
Fluorine gas (F2): I de mek smɔl smɔl kɔrɛshɔn we di tɛmpracha ɛn prɛshɔn ay.
Intahalogen fluorides: Kεmikכl dεm we rili riaktiv lεk klorin trifluoride (ClF3) εn bromin pentafluoride (BrF5) kin trigεr tranga riakshכn כ ivin kכmכshכn fכ PTFE we i tεmprachכ.
Rikɔmɛndishɔn: Kip PTFE fabrik fa frɔm dɛn kemikal ya, mɔ we di tɛmpracha go ɔp.
3. Mɔlt strɔng alkali dɛn na ay tɛmpracha
di mכlt sכdiכm haydroksayd (NaOH) εn potashכm haydroksayd (KOH) de kכrod di PTFE sכfayz sכmtεm oba 300°C, we de mek i lכs di haydrofobisiti εn di sכfa glos. dכn 300°C, PTFE de rεsist alkali dεm fayn fayn wan. Na rum tɛmpracha, nɔ ɛfɛkt.
4. Riaktiv mɛtal paoda dɛn na ay tɛmpracha
Magnesium pauda (Mg), aluminium pauda (Al), ɛn ɔda tin dɛn we tan lɛk am kin riak bad bad wan wit PTFE we di tɛmpracha ay, ɛn dɛn kin mek mɛtal fluorides ɛn kabɔn. Dis na di bies fɔ sɔm payroteknik ɛn insɛns kɔmpɔzishɔn dɛn we gɛt PTFE.
Kεmikכl dεm we De Atak di Fayba Glas Sabstεrayt Tru di Kכtin Dεfεkt dεm
Dɛn kemikal ya nɔ de riak wit PTFE, bɔt if di PTFE kɔtin gɛt ɛni pinhol, skrach, ɔ ed ɛksplɔshɔn, dɛn go go insay ɛn pwɛl di fayv glas.
1. Hydrofluoric acid (HF) – di wan we denja pas ɔl
Hydrofluoric acid kin pwɛl fayv glas bad bad wan. I de riak kwik kwik wan wit silikon dayɔgzayd (di men tin we de insay glas) fɔ mek silikon tetrafluoride gas, we de sɔlv di glas fayv dɛn.
PTFE insɛf de rɛsist HF pafɛkt wan – dɛn kin yuz PTFE bɔku tɛm fɔ HF handlin ikwipmɛnt.
Bɔt, PTFE-kɔt fabrik NƆ sef fɔ HF pas di kɔtin nɔ gɛt pinhol atɔl (we rili at fɔ garanti). Ɛni bad tin go mek HF wik insay di fayv glas, we go mek di klos nɔ wok kwik kwik wan.
Rikɔmɛndishɔn: Fɔ HF savis, yuz klin PTFE fim (nɔ gɛt fayv glas riinfɔsmɛnt) ɔ wan ful ɛnkapsul PTFE layna wit verified ziro pinhol.
2. Konsentret alkali na ay temperechur
di sכlushכn we kכnsantreyt sכdiכm haydroksayd (NaOH) we ay tεmprachכ kin erod fayv glas tru di kכt impεrfεkshכn. Rum-tɛmpracha, dilute alkali dɛn sef.
3. Konsentret fכsfכrik asid na ay tεmprachכ
If yu kɔntakt di ɔt kɔnsɛntret fɔsfɔrik asid fɔ lɔng tɛm, i go mek di fayv glas kɔrɛshɔn. Agen, PTFE insɛf de rɛsist am, bɔt di kɔtin dɛfɛkt na di wik pɔynt.
Impɔtant Mɛmba fɔ Kwɛmyuɛl Savis
1. Bɔku pan di tin dɛn we kin pwɛl kin kɔmɔt frɔm we dɛn de wɛr mashin ɔ we dɛn kin ol wit tɛm, nɔto bikɔs dɛn kin atak dɛn wit kemikal
Insay di tipik industrial aplikeshɔn dɛn (kɛmikal plant, it prɔsesin, ɛn ɔda tin dɛn), PTFE fabrik kin fel bikɔs ɔf abrashɔn, tear, ɔ ɔt dɛgradɛshɔn lɔng bifo kemikal kɔrɛshɔn bi wan prɔblɛm. di kεmikכl inεtnεs fכ PTFE na tru εn rilibul fכ kכlכsכl כl kכmכn kεmikכl dεm we de rich 260°C.
2. If yu fɔ handle agresiv kemikal, yuz pure PTFE film
Fɔ aplikeshɔn dɛn we gɛt fɔ du wit mɔlt alkali mɛtal, ɔt kɔnsɛntret HF, ɔ strɔng fluorinating ɛjɛn, dɛn nɔ kin advays fɔ yuz fayv glas we dɛn kɔt wit PTFE . Bifo dat, yuz:
Pure PTFE film (skived ɔ cast) we nɔ gɛt fayv glas riinfɔsmɛnt
PTFE-laynd mɛtal ikwipmɛnt
PFA ɔ FEP (ɔda fluoropolymer dɛn we gɛt di sem kayn rɛsistɛns bɔt difrɛn mɛkanikal prɔpati dɛn)
3. Ɔltɛm tɛst bifo yu yuz am ful-skel
If yu aplikeshɔn involv kemikal dɛn we nɔ de na di list as 'safe' na standad kɔmpitibliti chɛt, du wan matirial kɔmpatibiliti tɛst ɔnda rial ɔpreshɔn kɔndishɔn (tɛmpracha, kɔnsɛntreshɔn, durayshɔn). Aokai PTFE kin gi tɛst sɛmpul fɔ validɛshɔn.
Sɔmari – Kεmikכl Kכmpatibiliti Kwik Rεfrεns
Kεmikכl
Effekt pan PTFE Kɔtin
Ifekt pan Fayba Glas (if i de na do) .
Sef fɔ PTFE Fabrik?
Mɔs pan di asid dɛn (H2SO4, HCl, HNO3, ɛn ɔda wan dɛn) .
Nɔn
Nɔn
✅ Yɛs (te to 260°C)
Mɔs alkali (NaOH, KOH – diluyt, rum tɛmpracha) .
Nɔn
Nɔn
✅ Yɛs
Konsentret NaOH/KOH >300°C (mכlt) .
Smɔl smɔl, i kin rɔtin
Atak tru di tin dɛn we nɔ fayn
⚠️ Nɔ (yuz pure PTFE)
Haydrofluorik asid (HF) .
Nɔn (ɛksɛf rɛsistɛns) .
Disɔlshɔn kwik kwik wan
❌ Nɔ (lɛs di kɔtin pafɛkt) .
Ɔrganik sɔlvɛnt dɛn (asetɔn, toluɛn, alkol dɛn) .
Nɔn
Nɔn
✅ Yɛs
Alkali mɛtal dɛn we dɔn mɔlt (Na, K) .
Di pwɛl pwɛl kpatakpata
N/A
❌ Nɔ (yuz klin PTFE) .
Fluorin gas (F2) na ay temp
I de rɔtin
N/A
❌ Nɔ
Hot kɔnsɛntret fɔsfɔrik asid
Nɔn
I de erode smɔl smɔl
⚠️ Tek tɛm (avɔyd fɔ gɛt prɔblɛm dɛn) .
Aokai PTFE de gi kemikal kɔmpatibiliti gayd ɛn i kin rɛkɔmɛnd di rayt prodak – PTFE-kɔt fabrik fɔ mɔs aplikeshɔn, ɔ klin PTFE fim fɔ ekstrim kemikal savis. Kɔntakt wi wit yu patikyula kemikal, tɛmpracha, ɛn di tɛm we yu de yuz am.
