Modulus of Rupture, frequently abbreviated as MOR, (sometimes referred to as bending strength), is a measure of a specimen’s strength before rupture. It can be used to determine a wood species’ overall strength; unlike the modulus of elasticity, which measures the wood’s deflection, but not its ultimate strength. (That is to say, some species of wood will bow under stress, but not easily break.)

Modulus of rupture (MOR) testing

Modulus of rupture (MOR) testing

MOR is expressed in pounds-force per square inch (lbf/in2) or megapaschals (MPa). This number is given for wood that has been dried to a 12% moisture content, unless otherwise noted.

mor

In practical terms, the number itself isn’t all that meaningful, but it becomes useful to use in comparison with other woods. For instance, Hickory is known to have excellent strength properties among domestic species in the US, and has a MOR of 20,200 lbf/in2 (139.3 MPa). In comparison, Red Oak is another well-known wood used in cabinetry and furniture, and has a MOR of 14,300 lbf/in2 (98.6 MPa).

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10 Comments

  1. Para Koirala May 25, 2018 at 2:36 pm - Reply

    does 0.075 makes sense for the MOR of LVL?

    • Eric May 29, 2018 at 2:48 pm - Reply

      No, it does not. You need a unit of measurement with that number!

  2. naimatullah April 18, 2018 at 6:12 am - Reply

    what is the modulus of rupture of orange tree?

  3. p.savarimuthu raja p.raja September 13, 2017 at 5:42 am - Reply

    Eric pls reply

  4. p.savarimuthu raja p.raja September 13, 2017 at 5:40 am - Reply

    I need one question Madagascar pine and newzealand pine MOR and MOE standard

  5. Sakura Chan March 15, 2017 at 12:07 pm - Reply

    so thats means the higher the MOR value, higher the wood strength. Is it sir? because I’m still confuse. Thanks for the reply.

    • ejmeier March 17, 2017 at 5:37 pm - Reply

      Yes, higher MOR numbers mean stronger wood.

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  6. Eric February 25, 2013 at 5:15 pm - Reply

    From a quick sort, it looks like the highest MOR is African Blackwood, with Bulletwood and Wamara coming in second and third.

  7. sea February 25, 2013 at 5:11 pm - Reply

    sir, which wood has the highest modulus of rapture count and that too in Mpa?

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