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C37

C37

C37

5.2.2Humidi?ed De?ection —The specimens shall have an

average de?ection of not more than the following:

Thickness,

in.[mm]

Humidi?ed De?ection,Eighths of an inch [mm]3?8

[9.5]15[48]1?2[12.7]

10[32]5.2.3Core,End,and Edge Hardness —The specimens shall

have an average hardness of not less than 15lbf [67N]when

tested by Method A and 11lbf [49N]when tested by Method

B.

5.2.4Nail-Pull Resistance —The specimen shall have an

average nail-pull resistance of not less than the following:

Thickness,

in.[mm]

Method A Nail Pull Resistance,lbf [N]Method B Nail Pull Resistance,lbf [N]3?8

[9.5]50[222]46[205]1?2[12.7]70[312]66[294]5.3Foil Backed Gypsum Lath :5.3.1Foil-backed gypsum lath shall meet all of the require-ments for gypsum lath.5.3.2When tested in accordance with Test Method E 96,the permeance of foil-backed gypsum lath shall be not more than 0.30perm [17ng/Pa·s·m 2](Desiccant Method)for the condi-tion of 50%relative humidity on the face of the lath and 0%relative humidity on the foil-covered back side of the lath.6.Dimensions and Tolerances 6.1Specimens shall be taken from the samples obtained in accordance with Speci?cation C 1264.6.2Thickness,width,length,and end squareness shall be

determined in accordance with Test Methods C 473.6.2.1Thickness —The nominal thickness shall be 3?8or 1?2in.[9.5or 12.7mm]with tolerances in the nominal thickness of 61?32in.[0.8mm]and with local variations of 61?16in.[1.6mm]from the nominal thickness.6.2.2Width —The nominal width shall be up to 48in.[1220mm],with a tolerance of 3?16in.[5mm]under and 1?8in.[3mm]over the speci?ed width.6.2.3Length —The nominal length shall be 32,36,48,and up to 144in.[810,910,1220,and 3660mm]and tolerances shall be 1?4in.[6mm]under and 1?8in.[3mm]over the speci?ed width.6.2.4End Squareness —Corners shall be square with a tolerance of 61?4in.[6mm]in the full width of the lath.6.3Edges and Ends —The edges and ends shall be straight and either round or square.7.Finish and Appearance

7.1The surfaces of gypsum lath shall be true and free from

imperfections that render the lath un?t to receive and retain

gypsum plasters.

7.2Gypsum lath having burred or broken corners shall be

considered acceptable provided that the burred or broken

portion is not more than 1in.[25mm]in either dimension.

8.Sampling,Inspection,Rejection,Certi?cation,

Packaging,Marking,Shipping,Handling and Storage

8.1Shall be in accordance with Speci?cation C 1264.

9.Keywords

9.1gypsum;gypsum lath;gypsum lath,type X;foil-backed;

ceiling;partitions;wall SUMMARY OF CHANGES

Committee C-11has identi?ed the location of selected changes to this standard since the last issue,C 37-95,that may impact the use of this standard.

(1)The entire standard was placed into the C 11standard

product format.

(2)1.2was revised and a new 1.3was added.

(3)Terminology C 11,Speci?cation C 1264,and Test Methods

E 119were added to 2.1.

(4)Added Section 3,Terminology.(5)Added new notes to new 4.3.(6)Re-organized Physical Properties and Dimensions Sections (new Sections 5&6).(7)Replaced Sections 7,8,10,&11with a new Section 8,referencing Speci?cation C 1264.(8)Added additional key words.

The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the risk of infringement 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 ?ve years and if not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.Your comments will receive careful consideration at a meeting of the responsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards,at the address shown below.

This standard is copyrighted by ASTM,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.Individual reprints (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 service@astm.org (e-mail);or through the ASTM website

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