0 Items
My account
Phone: (011) 7541-421, 3409-301, 3409-335, 6547-293, 3409-310
E-mail: Standards sales: prodaja@iss.rs Education: iss-edukacija@iss.rs Information about standards: infocentar@iss.rs
Stevana Brakusa 2, 11030 Beograd
Main menu

ISO 4280:1977

Cryolite, natural and artificial, and aluminium fluoride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method

Nov 1, 1977

General information

90.60     Mar 5, 2026

ISO

ISO/TC 226

International Standard

71.060.50  

French   English  

Buying

Published

Language in which you want to receive the document.

Scope

Applicable to products having a content, expressed as sulphur trioxide, equal to or more than 0.1 % (m/m). Bases on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid. Extraction of the fused mass with perchloric acid solution and precipitation of the sulphate ions with barium chloride in an acidified medium. Filtration on a fine-texture, ashless filter paper (pore diameter approximately 0.4 to 1.0 m). Calcination after drying in an electric oven at (850 20) °C. Weighing of the residue.

Life cycle

NOW

PUBLISHED
ISO 4280:1977
90.60 Close of review
Mar 5, 2026

National adoptions

SRPS H.B8.127:1980  
ISS

Cryolite, natural and artificial, and aluminium fluoride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method

95.99   Withdrawal of Standard

B082 more

SRPS H.B8.192:1979  
ISS

Cryolite, natural and artificial, and aluminium fluoride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method

95.99   Withdrawal of Standard

B082 more