Karaatti (pitoisuus)

Tämä artikkeli kertoo pitoisuusyksiköstä. Karaatti on myös mittayksikkö.

Karaatti (lyhenne K) (engl. karat) on vanha jalometallien pitoisuuden yksikkö. Yksi karaatti on yksi kahdeskymmenesneljäsosa (1/24) painosta.[1] Tässä mielessä 24 karaattia tarkoittaa (lähes) täysin puhdasta jalo­metallia ja esimerkiksi 18 karaattia 750 promillen jalometallipitoisuutta. Nykyisissä suomalaisissa jalometallituotteiden leimoissa karaattia ei käytetä, vaan kulta- tai hopeapitoisuus ilmaistaan tuhannesosina seoksen massasta.[1][2] Esimerkiksi ulkomailta tuotu 14 karaattia kultaa sisältävä tuote voi alittaa Suomen jalometallisäädösten mukaisen vähimmäispitoisuuden 585 massan tuhannesosaa.[3]

Kullan pitoisuus
massan tuhannesosina karaatteina
375 9
583,3 14
750 18
800 19,25 *
916,7 22
999 24

(*) Portugalissa käytössä oleva kullan pitoisuusyksikkö.

Lähteet

  1. ↑ a b Kullan arvoista tietoa, Pitoisuusleimat Tukes. Viitattu 17.1.2017.
  2. ↑ Valtioneuvoston asetus jalometallituotteista (1148/2000), 7 § Finlex. Viitattu 17.1.2017.
  3. ↑ Jalometallituotteet (sivu 9, Mikä on karaatti?) (pdf) 2007. Tukes. Viitattu 17.1.2017.

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