ASTM_D_6643_-_01_2011.pdf

Designation:D664301(Reapproved 2011)Standard Test Method forTesting Wood-Base Panel Corner Impact Resistance1This standard is issued under the fixed designation D6643;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONCorner impact resistance may be an important property for wood-base panel applications such aspallets,cargo crates,concrete form boards,fruit and vegetable boxes and furniture.There is a need tohave suitable corner impact resistance in such products to ensure satisfactory enduse performance.This test method provides a technique to assess relative corner impact resistance of wood-base panels.This test method uses a vertical test frame to create corner impact on a panel specimen.The testspecimen is held in a fixture that free-falls to the floor.The test specimen is examined for distance ofimpact damage and for qualitative damage.1.Scope1.1 This test method shall be used to measure the relativecorner impact resistance and other damage that may occurduring the rough handling of wood-base panels or compositematerials.This test method is suitable for all wood-base panelssuch as plywood,oriented strand board,hardboard,particle-board and medium density fiberboard as well as other compos-ite panel products.1.2 This test method covers determination and evaluation ofthe effects of panels being dropped from various heights witha predetermined amount of dead load and angle of impact tosimulate an equivalent field application.1.3 The values of all information will be stated in Englishunits and regarded as standard.The SI values are written inparentheses.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D2395 Test Methods for Density and Specific Gravity(Rela-tive Density)of Wood and Wood-Based MaterialsD4442 Test Methods for Direct Moisture Content Measure-ment of Wood and Wood-Based Materials3.Terminology3.1 Definitions:3.1.1 actual damage,ndistance of damage counted fromtip to damage line after dropping.3.1.2 damage line,nthe innermost line where crushingoccurs.3.1.3 dropping head,nthe part of the machine connectedto the quick release mechanism that holds the test specimenand added amount of dead load.The dropping head free-falls tocreate the impact between the panel specimen and the floor.3.1.4 impact tip,nthe part of the specimen that will makeinitial contact with the floor after dropping.3.1.5 peeling,nthe furthermost splintering from the dam-age line.This provides additional understanding of damagecharacteristics.3.1.6 pull cord,ncord that is connected to the quickrelease mechanism that allows a quick release of the droppinghead by pulling.3.1.7 quick release mechanism,nthe equipment that al-lows for free release of the head when the pull cord isactivated.3.1.8 reference line,nline from which all measurementsare taken.This allows samples to be cut to approximate sizeand still ensure accurate values.4.Summary of Test Method4.1 Specimens are cut from the corners of the sample panel.The specimens are fastened to the lower edge of a dropping1This test method is under the jurisdiction of ASTM Committee D07 on Woodand is the direct responsibility of Subcommittee D07.03 on Panel Products.Current edition approved Nov.1,2011.Published November 2011.Originallyapproved in 2001.Last previous edition approved in 2001 as D6643 01(2006).DOI:10.1520/D6643-01R11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 head and clamped into position.The weight of the droppinghead is controlled to simulate the weight of the real application.The dropping head is raised to specified heights and released tofall to a rigid floor or other surface.The corner damage as wellas peeling is measured to indicate the corner impact resistance.Peeling beyond the damage line may also be reported.4.2 Optionally,sample can be subjected to wet-dry cycles tosimulate end-use applications.5.Significance and Use5.1 This test method determines the corner impact damagethat could be used to measure the relative corner impactresistance.6.Apparatus6.1 The drop test frame shall accommodate the test speci-mens as defined in Section 8.Atest frame 15-ft(4572-mm)tall,27-in.(686-mm)wide and 15-in.(381-mm)deep has beenfound suitable.The drop test frame sh