EN 975-2-2004 pdf download.Sawn timber-Appearance grading of hardwoods – Part 2 :Poplars.
This EN 975-2 defines appearance grades for European poplars
The standard applies to dry and green sawn timber, of thickness 15 mm up to 34 mm and of width 100 mm up to 250 mm measured in a green state.
This standard does not apply to the strength grading of structural timber.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) app’ies.
EN 844-1:1995. Round and sawn timber – Terminology – Part 1: General terms common to round timber and
sawn timber
EN 844-3:1995, Round and sawn timber – Terminology – Part 3: Generalterms relating to sawn timber
EN 844-4:1997. Round and sawn timber – Terminology – Part 4: Terms relating to moisture content
EN 844-6:1997. Round and sawn timber- Terminology – Pad 6: Terms relating to dimensions 01 sawn timber
EN 844-7:1997, Round and sawn limber – Termvnology – Pail 7: Terms relating to anatomical structure of timber
EN 844-9:1997. Round and sawn timber- Terminology – Part 9: Terms relating to features of sawn timber
EN 844 —10:1998, Round arid sawn timber – Terminology – Part 10: Terms relating to siam and fungal attack
EN 844-11:1998, Round and sawn timber- Terminology – Part 11: Terms relating to degrade by insects
EN 844-12:2000, Round and sawn timber – Terminology – Part 12: Additional terms and general index
EN 1310:1997, Round and sawn timber – Method of measurement of features
ENV 12169. Criteria for the assessment of conformity of a lot of sawn timber
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN 844-1:1995, EN 844-3:1995, EN 844-4:1997. EN 844-6:1997, EN 844-7:1997, EN 844-9:1997, EN 844-10:1998, EN 844-11:1998 and EN 844-12:2000 apply.
4.1 General rules
The grade of a piece of timber is based on the judgement of grade on each face/side separately.
If all four sides are of the same grade, this is the grade of the piece.
If one of the faces is of a lower grade than any of the other three sides, the grade of the piece is one grade better than the grade of this worse face.
If one of the edges has the lowest grade among the four sides, this lowest grade is the grade of the piece.
This standard only defines the lower limit of each grade. Any parcel of poplar supplied graded to these rules shall contain an even distribution of quality.
The conformity of a batch of sawn timber shall be assessed according to ENV 12169, unless stated otherwse.
4.2 Determination of features
4.2.1 General
Features are measured according to EN 1310.
4.2.2 Knots
Knots shall be assessed with regard to form, position and condition:
Knots of 8 mm or less are not considered unless unsound / loose;
Round/oval knots on faces are to be measured in accordance with clause 4.1.1 of EN 1310:1997 induding the compensation rule;
Round/oval knots on edges are to be measured in accordance with clause 4.1.2 of EN 1310:1997.
NOTE 1 An intergrown knot may appear as a partially intergrown knot or a dead knot on the opposite face
NOTE 2 A partially intergrown knot may appear as an ntergrown knot or a dead knot on the opposite tace
NOTE 3 A dead knot may appear as an intergrown knot or a partially intergrown knot on the opposite face
4.2.3 Wane
Wane with bark is not permitted.EN 975-2-2004 pdf download.