m e d i u m
d e n s i t y
Table 2
f i b e r b o a r d
Physical and Mechanical Property Requirements for MDF (< 9.5 mm (0.375 inch) Thick) When Determined in Accordance with ASTM D 1037-06a 1,2 Table 2: Physical requirements Part B and TestMechanical Methods forproperty Hardboard
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for MDF when determined in accordance with ASTM D 1037-06a Part B test methods for hardboard Grades
Physical and Mechanical Properties Internal Bond (IB)
Modulus of Rupture (MOR)
Maximum Thickness Swell (TS)
N/mm2
(psi)
N/mm2
(psi)
mm
(inch)
210
18.9
2741
0.32
46
2.2
(0.087)
220
28.9
4192
0.54
78
2.2
(0.087)
230
28.9
4192
0.90
131
2.2
(0.087)
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Property
In this modern home , Clear-coated MDF was used for interior walls, doors and casework. Embossed panels Requirements CommonMDF to all MDFadd texture, . richness and dimension to any interior
Properties
Tolerance Limits
Panel Length or Width > 0.61 m (2 feet) Panel Average from Specified Thickness3,5 Variance from Panel Average Thickness3,5
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+ 2.0 mm (0.080 inch) + 0.125 mm (0.005 inch)
FORMALDEHYDE EMISSION LIMITS + 0.125 mm (0.005 inch)
The standard a tiered system of emis< 0.33has percent sion levelsSee allowing Formaldehyde Emissions below either a maximum of 0.21 ppm 0.11 ppm for panels thicker thanFormaldehyde 8 Formaldehyde Emissions ≤ 0.21 or ≤ .011 for MDF withor a minimum thickness greater than 8mm. Emi sions ≤ 0.21 ppm or ≤ 0.13 ppm for MDF with a maximum thickness ≤ 8mm mm. Panels 8 mm and thinner shall conform to either the 0.21 ppm or 0.13 ppm maximum limit. To meet the needs of the market, 1) Grades shall also meet the requirements listedmany in Section 3 ofmanufacturers this Standard. have voluntarily MDF 2) Refer to Section 4, Identification, for grade, formaldehyde moisture resistance product identification developed emission, ultra low-emitting and noand added urea-formaldehyde (NAUF)value products. There 3) Physical and mechanical property values represent a minimum or maximum representing 5 (lower) or 95 (up per) percentile expressions, respectively. are a wide variety of products available today levels, as well 4) MOR and IB shall be tested in accordance withwith Part reduced B of ASTMformaldehyde D 1037-06a. as panels. a growing number of non-formaldehyde 5) Thickness tolerance values only apply to sanded alternatives. Those companies currently pro6) Linear expansion shall be measured between 50% and 80% RH in accordance to ASTM D 1037-06a. ducing NAUF products are identified in the product listings in this Guide. JFP Joe Fletcher Photography
Linear Expansion (LE)3,6
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MDF continued on page 18 �
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