Technical Specifications

On Laminated floors for dry freight containers, swap bodies & trailers

This general specification covers floors made of 1ST Class Selected Nordic spruce, pine, and birchwood.

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2: Definition
For the purpose of this specification, the definition in ISO 830 and the following shall apply.

2.1: Acceptable
Acceptable to the purchaser

2.2: Board
Consisting of layers of selected spruce, pine and birch wood, glued together (a laminate) with the general fibre direction and the longitudinal axis of each layer approximately parallel to the longitudinal axis of the member.

2.3 Crack
A separation of the wood fibres along the grain of the wood that forms a crack or fissure, but does not extend through a piece from one face to the opposite face.

2.4: Floor
A floor consisting of a number of boards laid side by side according to customer specification.

2.5: Loose knot
A knot which is partly intergrown with the surrounding wood fibres, and which cannot be relied upon to retain its position in the wood.

2.6: Product
A board manufactured in accordance with this specification.

2.7: Sound knot
A knot that is free from decay and damage from insect, and that is firmly attached along at least 3/4 of its periphery to the surrounding wood on the face- or back side (or both).

3.1: Type of timber

A) Selected Nordic Spruce timber is used for the manufacturing of NORCON boards.
B) Selected Nordic Pine timber is used for the manufacturing of NORPINE boards.
C) Selected Nordic Birch timber is used for the manufacturing of NORSTRONG boards.

3.2: Other defects (Each piece shall be free form:)

a) Cross fracture (compression breaks)
b) Decay other than in knots
c) Insect damage
d) Mechanical damage.

4.1: Defects that are allowed in the final product at the time of dispatch is as follows:
Table 1 Permissible defects on best face of NORCON, NORPINE, NORSTRONG

Defects:		Max.allowance
Any tight knot judged along the longitudinal axis of the lamination.		60mm
Loose knots and knot holes		20mm
Cracks:
Sum of lengths		1/10 of the board.
Width		0.5mm
Spring in board:		15mm
Cup in board:		3mm




Discolouration:	NORCON & NORPINE	NORSTRONG
Light	Not limited	Not limited
Medium	1/4 of surface area	Not limited
Heavy	None	1/10 of surface

All repairs will be done with a well?filling bonding agent, which is equal in strength and durability to that used to bond the individual lamina.

The following is valid by judging the knot:



4.2: Density
When final board is tested according to ISO 3131, the density by content of moisture at 12% will be as follows:

4.2.1: Floors of spruce wood:
Density of boards shall be in the range of 480Kg.

4.2.2: Floors of pinewood:
Density of boards shall be in the range of 540Kg.

4.2.3: Floors of Birchwood:
Density of boards shall be in the range of 640Kg.

4.4 Open glue lines:
The finished board shall be free from any open glue lines on topside.

4.5: Fillings:

4.5.1: Surface:
Fillings shall be allowed provided that an acceptable non-shrinkable and durable material in a colour that matches the surrounding wood is used.

4.5.2: Shiplap:
A shiplap may be reworked to acceptable standard, provided that the adhesive and material used shall comply with the relevant specifications as set out in this technical specification.

4.5.3: Recessed lamination:
A recessed lamination may be reworked to acceptable standard, provided that the adhesive and material used shall comply with the relevant specifications as set out in this technical specification.

4.7: Dimensions

4.7.1: General
The dimensions of each individual board will comply with those given by the purchaser in his order, and tolerances according to 4.7.2.

4.7.2: Tolerance's
The applicable tolerance at the time of dispatch on the dimensions of the individual board, shall be as follows:
- Thickness ± 0.5mm
- Width +1/-2mm
- Length +0/-3mm

4.8.1:
For dry freight containers the standard floor is NORCON. The NORCON floors can be delivered treated with Celpruf P. This treatment complies with Quarantine aspects and procedures published by the Australian Quarantine & Inspection Service.

For trailers and swapbodies the floors may be treated on customer request or it can be delivered without treatment.

A: The finished surface of the board shall have an even finish, and ends shall be evenly sawed.

B: A machine skip shall be allowed provided that:

1) Top side
- It does not cover more than 5% of the surface area.
- The overall dimensions falls within the tolerances as set out in 4.7.2.

2) Back side
- It has a maximum depth which do not exceed more than 10 mm.
- The sum of the length of the number of skips, do not exceed more than 10% of the total length of the board.

C: Recessed lamination shall be allowed provided that:

- It appears on the backside only.
- It has a maximum depth, which not exceed more than 2 mm.
- It shall cover a maximum area of 30% of a surface.

4.10.1: NORCON & NORPINE

Boards of 30mm ISO rating 5.460Kg = 21.6 kN
Boards of 32mm up to 35mm IS0+1/3 rating 7.260Kg = 28.2 kN
Boards of 35mm up to 45mm ISO+2/3 rating 9.060Kg
can be developed and offered upon request.

4.10.2: NORSTRONG

Boards of 30mm and 32 mm IS0+1/3 rating 7.260 Kg = 28.2 kN
Boards of 35mm IS0+2/3 rating 9.060 Kg
can be developed and offered upon request.

a) The date of manufacture.
b) The preservative treatment used.
c) Manufacturers identification.
d) Size and number of packages.

- Tests are carried out in conjunction with NTI (Norwegian Institute of Wood Technology).
- Tests and strengths are tested in accordance to 4.10.1.
- Delaminating is tested in accordance to EN 391 C.

a) The contract number.
b) Drawing and number of the specific drawing.
c) Total width of floor, exclusive expansion.
d) Total length of floor, exclusive expansion.
e) Thickness.
f) Wood to be used in ordered floor

8.1: Apparatus
A testing machine that has the capacity of at least 50 kN, and having a suitable device which can apply a point-load over a span of 400 mm. The support and loading bearer has to be capable of adjustment of the supported surface, and the loaded surface of the tested sample is maintained in full contact with the bearer and that supported edges are approximately 25 mm.

8.2: Test specimens
Select at random 3 (three) boards of full length and full width from normal production, where the maximum number of defects occurs reasonably close to centre.

8.3 Method of tests
Submit each sample to proof the loading with the load applied over the width of the board at right angle to the glue line. The distance between a point of support and the nearest point of load is to be exactly half the span (the distance between the supporting points). The result to be recorded to the nearest 0.1kN.

Specifications for NORCON, NORPINE & NORSTRONG

		NORCON		NORPINE		NORSTRONG
		Spruce		Pine		Birch
Net weight g/cm³ at 12% humidity		0.48		0.54		0.64
Elasticity module N/mm²		10.000		10.400		14.900
Tensile strength N/ mm²		116		95		173
Compressive strength N/mm²		39/5.3		50/7.0		56/4
Bending strength N/mm²		87		91		105
Hardness		29		36		48