Polyisocyanurate, also referred to as PIR, polyiso, or ISO, is a 
thermoset plastic[1] typically produced as a foam and used as rigid 
thermal insulation. Its chemistry is similar to polyurethane (PUR) 
except that the proportion of methylene diphenyl diisocyanate (MDI) is 
higher and a polyester-derived polyol is used in the reaction instead of 
a polyether polyol. Catalysts and additives used in PIR formulations 
also differ from those used in PUR.
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Tipo PIR atsparesnis aukstesnei temperaturai, todel matyt atitinka 
kazkokius priesgaisrinius reikalavimus. Chemiskai labai panasus dalykai, 
todel ir vandens igeriamumas bus panasus.

Blyn, nu man ne uz ka nedaeitu sugalvoti uzkasti i zeme PUR/PIR. Jie gi 
kaip porolonas koks (beveik). Tik XPS. Ir ne siurksciu (frezuotu) 
pavirsiumi, o blizgiu.

Cia dar apie skirtumus.

http://brufma.co.uk/what-is-pirpur/




On 2015.01.27 18:56, BigM wrote:
> Ačiū už info.
> O kaip su PIR?
> Radau čia vieną šaltinį, kad jis dar ~50 kartų sunkiau įgeria nei EPS...
>
> http://pentoir.com/what-is-the-difference-between-open-cell-and-closed-
> cell-polyurethane-foams.php
>
>
> On Tue, 27 Jan 2015 08:22:18 +0200, golfietis wrote:
>
>> Kadangi gaminam termo kebulus automobiliam, tai visi tie dregmes
>> igeriamumai yra labai svarbus mum.
>>
>> XPS neigeria dregmes - nei kapiliarais, nei vandens garu pamatams
>> neaktulu).
>>
>> EPS igeria daugiau, ypac perpjautas, nutarkuotas t.y. atidarytas
>> pavirsius.
>>
>> PUR igeria geriausiai. PUR silumos laidumas yra pats maziausias is tu 3,
>> bet taip buna tik pirmus ~5 metus. Gamybos metu PUR celes yra uzpildomos
>> pentanu, kuris per laika difunduoja ir jo vieta uzima oras. Kazkur
>> turejau bandymu rezultatus, kad po mazdaug 5 metu PUR ir EPS (Neoporo)
>> laidumai susivienodina.