1、Designation:D 457 85(Reapproved 1997)Standard Specification forModified Soda(Sesquicarbonate Type)1This standard is issued under the fixed designation D 457;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers material suitable for variouswashing,cleaning,and scouring processes,with or withoutsoap as conditions demand,an
3、d where a mildly alkalinematerial is desired.1.2 This material may be hazardous if not properly man-aged.1.3 Precautionary information for the safe use,storage anddisposal of this material should be preliminarily obtained fromsuppliers and others.1.4 In case of personal accident with this material,a
4、pplyappropriate first aid,telephone the nearest Poison ControlCenter for assistance,and get medical attention immediately.2.Referenced Documents2.1 ASTM Standards:D 501 Test Methods of Sampling and Chemical Analysis ofAlkaline Detergents23.Terminology3.1 Definition of Term Specific to This Standard:
5、3.1.1 Modified soda(sesquicarbonate type)shall be a white,uniform powder or crystal,as specified by the purchaser,composed of sodium carbonate and sodium bicarbonate.NOTE1This product is commonly known as laundry soda.4.Ordering Information4.1 Modified soda(sesquicarbonate type)shall be purchasedby
6、net weight.5.Chemical Composition5.1 Modified soda(sesquicarbonate type),as received,shallconform to the requirements as to chemical compositionprescribed in Table 1.6.Sampling and Analysis6.1 The material shall be sampled and analyzed in accor-dance with Test Methods D 501.1This specification is un
7、der the jurisdiction ofASTM Committee D-12 on Soapsand Other Detergents and is the direct responsibility of Subcommittee D 12.14onSpecifications for Analysis of Inorganic Alkaline Detergents.Current edition approved May 31,1985.Published July 1985.Originallypublished as D 457 37.Last previous editio
8、n D 457 39(1980).2Annual Book of ASTM Standards,Vol 15.04.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for the latest informati
9、on.The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connectionwith any item mentioned in this standard.Users of this standard are expressly advised that determination of the validity of any suchpatent rights,and the risk of inf
10、ringement of such rights,are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard
11、 or for additional standardsand should be addressed to ASTM Headquarters.Your comments will receive careful consideration at a meeting of the responsibletechnical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make yourviews known to the AST
12、M Committee on Standards,100 Barr Harbor Drive,West Conshohocken,PA 19428.This standard is copyrighted by ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.Individualreprints(single or multiple copies)of this standard may be obtained by contacting ASTM at the above address or at 610-832-9585(phone),610-832-9555(fax),or serviceastm.org(e-mail);or through the ASTM website(http:/www.astm.org).TABLE 1 Chemical RequirementsminmaxTotal alkalinity as Na2O,%3943Sodium bicarbonate(NaHCO3),%3550Sodium carbonate(Na2CO3),%3550Matter insoluble in water,%0.1D 4572
