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Technical Specification for Wooden Backup Board

Application:

Circuit Board Drilling, Flexible Circuit Board, Double Sides, Surface Mount, Back-Plane, High Density Interconnect MLB.

Thickness:

2.50mm ( MDF )

Properties ASTM Unit Value
Thickness - mm 2.5 < t < 4
Density - kg/m3 830
Density Tolerance - kg/m3 20
Moisture Content - % 7 + 2
Thickness Tolerance - mm 0.15
Single Board Thickness Tolerance - mm 0.15
Modulus of Rupture - N/mm2 > 35
Modulus Elasticity - N/mm2 > 3000
Wet modulus of Rupture - N/mm2 > 10
Internal Bond - N/mm2 > 1.0
Screwholding Face N -
( thickness > 15mm ) Edge N -
Thickness Swelling (20C, 24 hours) % < 17
Absorption by Mass (20C, 24 hours) % < 45
Dimensional Stability 20C      
( 35% RH & 85% RH ) Length/Width % < 0.50
Surface Absorption - mm > 150
Surface Soundness - N/mm2 > 1.2
Sand Content - % < 0.05
Formaldehyde Emission (EMB) Class B (mg/100g) < 30
Formaldehyde Emission (JIS) (mg/I) < 5

 

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