The presidential address to the seventeenth congress of industrial chemistry delivered in paris in october by sir robert mond, F.R.S.E
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2010
- Weight
- 514 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0368-4075
No coin nor oath required. For personal study only.
✦ Synopsis
I045
A iuatcrisl with n high surfiicc liardncss is in gciicrnl iiiorc rcndily polishccl and clcniicil niid lcss siisccptiblc to staining. Phcnol-forninldcliydc rcsiiis givc tlic highest, and cclliilosc cstcrs tlic lowest, Brincll Iiiirdiicss figiircs, this being tlic rcvcrsc of tlic iiiipct strcngths.
Vulcanitc, polyvinyl cliloridc-cstcr, niitl polyncrylntc resins ugniii occiipy iiitcriiicdintc positions.
Two ndtlitionnl propcrtics of soiiic iiiiportniicc, h i t \vhicli do not, fiill witliiii eitlicr of tlic tlircc groirps tliscusscd, arc tlic ciisc of repair i11it1 rctcntioii of iiietnls iiiitl porcelniii (tcctli). On tlicsc points tlicrc is n coiisidcmble di~crgciicc of opinion ns to t h rclitt,i.c iiicrits of the vnrioiis typcs of plnst,ic.
Siiicc ir rcpiiir is iiiiitlc by iiiiitiiig tlic I)roltcii Iliir'ts witA new niiitcriiil, B iiiorc siitisfiictory junction slioiiltl IE possible \vitIi licrit coiivcrtil)lc plitstics, its tlic irriioii is it chcniicnl onc, hit, n t tlic si~iiic time tlicrc is n risk of over-ciiriiig tlic origiiinl iiiiitcriid. With tlicriiioplitstics tlic junction will lie wciil; uiilcss iL Iio~iiogciicoiis fusioii of the pnrh is possiblc. iL plastic I):ISC is i l liictor 011 wliich tlic siiitiibility of tlic iiiittcriiil for prtiiil dcntiirc work dcpcrids. Tlic retention of' nictiils n ~i d po"hti~i tccth ~~i i l t l bc iilTcctctl by itiiy tcntlency of tlic plastic bnsc to warp or soften (luring \'citr.
Itctcntioii ol' Iiietiils