ISO INTERNATIONAL STANDARD 2027 Third edition 1990-02-01 Natural rubber latex concentrate, evaporated. preserved - Specification Latex concentre de caoutchouc naturel evaporé, préserve - Specifications Reference number ISO 2027:1990(E) or Standardizatior No reproduction or networking permited without license from IHS Not for Resale ISO2027:1990(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (Iso member bodies). The work of preparing International Standards is normally carried out through Iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- work. Iso collaborates closely with the International Electrotechnical Commission (lEC) on all matters of electrotechnical standardization. Draft international Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance accordance with Iso procedures requiring at least 75 % approval by the member bodies voting. International Standard Iso 2027 was prepared by Technical Committee Iso/TC45,Rubberandrubberproducts. This third editioncancels and replaces the second edition (isO2027:1978),ofwhichitconstitutesaminorrevision. ?ISO1990 or by, any means, electrontc or mechanicai, Including photocopying and microfilm, without permissioninwritingfromthepubllsher. International Organization for Standardization CasePostale56·CH-1211Geneve20·Switzerland Printed inSwltzerland i Proviah bntenatinal Ooganizatin for Standardization networking permitted without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 2027:1990(E) Natural rubber latex concentrate, evaporated, preserved Specification Scope Iso 35:1989, Natural rubber latex concentrate -- De- termination of mechanical stability This International Standard gives specifications for natural rubber latex concentrate which has been Iso 123:1985, Rubber latex-Sampling. concentrated by evaporation. It does not apply to IsO 124:1985, Rubber latices -Determination of total natural rubberlatex concentrateswhichhavebeen concentrated by centrifuging or creaming, or to solids content. laticesfrom natural sourcesother thanHevea brasiliensis, or to compounded latex or vulcanized Iso 125:1990, Natural rubber latex concentrate - Determination of alkalinity. latex. This International Standard covers requirements for Iso 126:1989, Natural rubber latex concentrate evaporated natural rubber latex concentrates of the Determination of dry rubber content. following types: Iso 506:1985,Natural rubber latex concentrate NR latex, type HA evaporated: Evaporated latex Determination of volatile fatty acid number. concentrate preserved with ammonia only or with ammonia together with other Iso706:1985,Rubberlatex Determination of preservative(s), with an alkalinity of at least coagulum content (sieve residue). 0,60%(m/m)withrespecttothelatex. Iso 2005:1985, Natural rubber latex concentrate NRlatex,typeKHsevaporated:Evaporatedlatex Determination of sludge content concentrate preserved with potassium hydroxide and having a nominal total solids content of IsO7780:1987,Rubbers and rubberlatices-Deter- 73 % (m/m). mination ofmanganesecontent--Sodiumperiodate photometric methods. NR latex, type KLS evaporated: Evaporated latex concentrate preserved with potassium hydroxide iso 8053:1986,Rubber and latex -Determination of and having a nominal total solids content of copper content --Photometric method. 68 % (m/m). 2 Normative references Requirements The following standards contain provisions which, through reference in this text, constitute provisions The latex concentrate shall conform to the require- of this International Standard. At the time of publi- ments given in table 1. cation, the editions indicated were valid. All stand- ardsaresubject to revision， and partiesto In the case of NR latex