timber hardness scale

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All floors are subject to impact and all floors will dent under some conditions. It is one of the best measures of the ability of a wood species to withstand denting and wear. The scale was designed by Gabriel Janka in 1906 and it was standardised in 1927 by the American Society for Testing and Materials. This test is used to measure a type of wood’s ability to resist dents and scratches.The Janka hardness rating scale was named for Gabriel Janka (1864–1932), an Austrian wood researcher. VCS Solid Timber The results are displayed in various ways in different countries. All rights reserved. This test measures the force required to embed an 11.28mm (0.444 in) steel ball to half its depth into wood. The Janka hardness test measures the hardness of wood. This number is given for wood that has been dried to a 12% moisture content, unless otherwise noted. To give some quantification to the issue of wood species hardness, the lumber industry created the Janka hardness scale—a standard now widely accepted as the best means of ranking a wood's hardness. It is one of the best measures of the ability of a wood species to withstand denting and wear. TIMBER HARDNESS SUMMARY TABLE Mahogany, Honduran 800 Padauk 1725 Mahogany, Santos 2200 Tabaccowood 1750 Maple, Hard North American 1450 Rosewood, Bolivian 1780 Maple, Ivory 1500 Bamboo, Carbonized 1800 Maple, Soft 999 Hickory 1820 Merbau 1925 Pecan 1820 Mesquite 2345 Yellowheart 1820 Oak, Tasmainian 1010 Kenpass 1854 Olivewood, Brazilian 3700 Jarrah, Australian 1915 Padauk 1725 Bubinga 1980 … The Janka hardness test is the industry standard for determining the ability of a particular timber species to withstand denting and wear. Approximately 5-10%. Some understanding of the Janka Hardness Scale can help you decide which hardwood flooring will stand up to your particular needs. The Janka hardness test is the industry standard for determining the ability of a particular timber species to withstand denting and wear. The higher the Janka rating, the harder the timber species. The standard unit of measurement of the Janka Hardness Scale is in units of force. Help Line: 0800 SIKKENS (745 5367) Ph: 09 571 0023, Fax: 09 571 0022, Internet: www.jacjay.co.nz, Email: sales@jacjay.co.nz © 2020 713.266.7608 or e-mail, Here are some interesting links for you! The hardness of a timber is measured by the Janka hardness test. Imagine how western red cedar floorboards would look after a year of use. Wood hardness testing I have always been meaning to figure out a simple way to characterize the strength of some of the wood that I use. That’s where hardness really matters. It also indicates the effort required to either nail or saw the particular wood species. Hardness is expressed in kilo newtons; the Janka rating is a measure of the wood to resist indentation. Schenck & Company is pleased to provide you with this valuable resource to assist you with your decision. (Who could imagine a wood species that is over three times harder than white oak?) The test measures the force required to push a steel ball with a diameter of 11.28 millimeters (0.444 inches) into the wood to a depth of half the ball’s diameter. This describes the grading of the timber. Web site design by Show & Tell - Melbourne, Australia, D Borthwick & Sons Pty Ltd    |    Enjoy your stay :). For wood hardness is a measure of resistance to dent and wear. These ratings were determined using the Janka Hardness Test which measures the side hardness measure of the force required to embed a.444 inch steel ball to half its diameter into the wood. It involves measuring the force required to embed an 11.28mm (0.444in) steel ball into wood to half its diameter. Because hardness is an important factor, and hardness varies for each species, the Janka Scale of Hardness is an excellent tool to help identify appropriate choices. In Australia, Janka results are displayed in either newtons (N) or kilonewtons (kN). Wood density influences timber classification and scheduling for appropriate use. The hardness of a timber is measured by the Janka hardness test. This method was chosen so that the result would leave an indention 100mm² (0.16sqin) … Timber Information 1 10.25 /14 pages November 2017 Jac Jay Limited PO Box 12 161, Penrose, Auckland. Hardness is an important consideration when selecting a suitable timber to match your lifestyle requirement. All photos and content property of Schenck & Company. This force is recorded in both pounds-force (lbf) and kilo-Newtons (kN). The Janka test measures the force (N, lb f) required to embed an 11.28 mm steel ball into the wood half the ball's diameter. 68 Burwood Highway, Burwood 3125 Victoria    |    1300 356 671, Copyright © 2020 Borthwick Floors Pty Ltd, Borthwick Floors - timber hardness, janka hardness test, wood floor denting, wear - home. How important is hardness when looking at timbers? It also indicates the effort required to either nail or saw the particular wood species. We have found this to be one of the best measures of the ability of wood species to withstand denting and wear. The Janka Side Hardness test measures the force required to press an 11.28mm (0.444 inch) steel ball to half its diameter cross-grain into a block of wood. Australia uses the Janka scale as a reference when looking at hardness of timbers. “The bulk of the Tas Oak mix is now E. Obliqua which would actually sit somewhere between a 6 and a 7 on the Janka scale, which is quite a good commercial grade of hardness.” “In my opinion, Tasmanian Oak is as good of a product as any, especially in a residential or sensibly detailed commercial environment.” The woods are listed from hardest to softest, so the higher the number, the harder the wood. Actual values change according to the tree growth and the method of timber cutting (tree-ring position). The Janka Test was developed as a variation of the Brinell hardness test. It determines the hardness of wood by measuring the force required to push a steel ball with a diameter of 11.28 millimetres (0.444 inches) into the wood to a depth of half the ball’s diameter. Oak vs maple flooring pros and cons superior hardwood flooring relative hardness chart of hardwood wood flooring species harder janka hardness test wikipedia janka scale wood hardness evergreen. researcher. The scale was developed as a means for displaying the results of the Janka hardness test. This is done by testing the floor’s resistance by measuring how much pressure is needed to embed an 11.28 millimetre ballbearing halfway into the boards surface. The scale used in the table is pounds-force. But hardness can also Larger force - … Under the Janka Hardness Rating, simply, the higher the number the harder the wood. Morlan also provides a lengthy list of Janka hardness values for various woods , of which the current record holder is Allocasuarina luehmannii , … The Janka Hardness scale is a specification that pertains to the hardness of wood. This table gives information about the relationship between timber hardness and density. Our chart is based on the Janka Hardness Scale which is the industry standard for gauging the ability of various wood species to resist denting and tolerate normal wear. The Janka (or side) hardness test measures the force required to embed a .444-inch steel ball to half its diameter in wood. In general terms, a medium density timber will have a Janka rating of 4 to 8, whilst a high density timber achieves a rating of 8+. Hardness and wear resistance Hardness and wear resistance are generally related concerns on timber floors. Even though a Janka rating of 8 is considered ‘hard’, many Australian timber species achieve ratings of … This test measures the force required to embed an 11.28mm (0.444 in) steel ball to half its depth into wood. The hardness of the wood according to Brinell scale is calculated by dividing the weight, putting the pressure against the wood, with a measured indentation. The Janka scale is used to determine the relative hardness of particular domestic or exotic wood species. The Janka test measures the amount of force needed to drive a 0.444-inch steel ball into wood to a depth equal to half its diameter. On the whole, old-growth lumber tends to be slightly heavier (29 lbs/ft 3 versus 26), harder (480 lb f Janka hardness versus 420), and stronger (10,000 lb f /in 2 modulus of rupture versus 7,900) than younger second-growth lumber. The Janka test measures the amount of force required to embed a 0.444" steel ball into the wood to half of its diameter. Janka Hardness Scale The Janka scale is used to determine the relative hardness of particular domestic or exotic wood species. The Janka test measures the amount of force required to embed a 0.444″ steel ball into the wood to half of its diameter. The Janka hardness test (from the Austrian-born emigrant Gabriel Janka, 1864–1932) measures the resistance of a sample of wood to denting and wear. The hardness of a wood is rated on an industry wide standard known as the Janka hardness test. *The data used are for air-dry density, that is, the wood at 12% moisture content, which is the average equilibrium moisture content for internal environments in Queensland. Select grade has limited variations and natural characteristics. The Janka Hardness Scale is a test used to determine the hardness and density of a hardwood timber and bamboo floor. Timber Species Hardness Australian Chestnut – 8.1 The higher the Janka rating / number the greater the hardness. This information sheet explains how the ‘Pencil Hardness Test’ can be used to help assess the hardness of coatings. The Janka Hardness Rating which is used to calculate the relative hardness of a particular timber species measures the required force to drive in a steel ball of diameter .444 inch to .222 inch in a piece of the particular wood species that the test is carried out on. A hardness rating is applied to all timbers that is a measure of the woods resistance to indentation. For reference, white oak has a Janka hardness of 1,350 lb f (5,990 N), while the super-hard lignum vitae has a hardness of an astounding 4,390 lb f (19,510 N). The end hardness of wood/lumber/timber will almost always be higher {harder} than its side hardness. As a rule, the higher the timber is on the number scale, the more durable, harder and scratch resistant it is. The Janka Hardness Scale determines the hardness of a particular type of wood. It measures the force required to embed an 11.28 millimetres (0.444 in) diameter steel ball halfway into a sample of wood. Wood Hardness Scale This scale includes all of the different species of hardwood and rates them according to their hardness and durability against wear and indentations caused by heels of shoes or dropping items on the floor. Looking around on the web, there is the well established Janka hardness test. The higher the Janka Rating, the harder the timber is. Woods with a higher rating are harder than woods with a lower rating. Our chart is based on the Janka Hardness Scale which is the industry standard for gauging the ability of various wood species to resist denting and tolerate normal wear. It will also indicate the ease of nailing, drilling or sawing a … The test uses a 2″ x 2″ x 6″ piece of wood and a 0.444″ steel ball to determine how hard the wood is. The Janka Test is a measure of the hardness of wood. Durability is a major factor to be considered when selecting a floor. Standard grade has more gum vein, spirals and natural characteristics. The results of hardness are only stated in approximate values. It’s interesting to note that the Janka scale is most often referred to by the flooring industry. The hardness of coatings applied to all timbers that is over three times harder than woods a... 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