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UltraStock® MR MDF

Engineered to resist elevated moisture and humidity, UltraStock® MR meets the thickness swell and bond integrity criteria required for the MR 50 designation.

  • Provides the same physical characteristics and workability as our premium panels.
  • Manufactured with 100% NAF resin.
  • Meets reduced thickness swell criteria of 5.5% or less.
  • Meets bond integrity criteria of 50% of original MOR after accelerated aging.

Details

UltraStock® MR50 MDF is designed to work well in interior applications where moisture is a concern.

  • Sink bases, dishwasher enclosures, wet-area residential applications
  • May be used on interior window and door trim, baseboards and laminate flooring.
  • Laboratories, locker rooms, laundry areas, cafeterias of schools, industrial facilities and other public buildings.

Applications

  • Sink bases, dishwasher enclosures, wet-area residential applications
  • May be used on interior window and door trim, baseboards and laminate flooring that may become wet from mopping, condensation or even foot traffic.
  • Laboratories, locker rooms, laundry areas, cafeterias of schools, industrial facilities and other public buildings where wetness or high humidity are a factor.

Dimensions

Thickness 1/4" - 1 1/12"
Widths To five feet
Lengths To sixteen feet

Physical Properties

Minimum Panel Averages1 1/4 - < 1/2" 1/2" - 3/4" > 3/4"
MOR-Modulus of Rupture (psi) 4,050 4,050 4,050
MOE-Modulus of Elasticity (kpsi) 405 405 405
IB-Internal Bond (psi) 130 120 110
Face Screw Holding Capacity (lbs) 250 270 270
Edge Screw Holding Capacity2 (lbs) NA 250 250
Formaldehyde Emissions CARB II Compliant
24-Hour Thickness Swell ≤ 5.5% ≤ 5.5% ≤ 5.5%

1. One-panel minimum average per ANSI 208.2

2. Not applicable for thinner than 5/8"

Tolerances

Length & Width ± 1/16" per panel
Squareness 1/64" per foot of length
Straightness 1/64" per foot of length
Thickness (within panel) ≤ 0.005"
Thickness (panel to panel) ≤ 0.005"

Raw Materials

Wood Species: Mixed Hardwoods

Transportation

Truck or rail

Environmental Credits

LEED Credit Description
Recycled Content MR credit 4 Awards 1 or 2 points for using products with recycled content that constitute at least 10% or 20%, based on cost, of the total value of project materials.
Regional Materials MR credit 5 Awards 1 or 2 points for using materials on a project that are extracted and manufactured within 500 miles that constitute at least 10% or 20%, based on cost, of the total value of project materials.
Environmental Quality EQ credit 4.4 Requires composite wood products used on project to demonstrate documented compliance with California Air Resources Board ATCM formaldehyde requirements for ultra-low-emitting formaldehyde (ULEE) resins or no-added-formaldehyde (NAF) resins.


GREEN GLOBES Credits Description
Low-VOC Emitting Materials G2.9 Specifies architects to select low-VOC emitting materials


National Green Building Standard Credits Description
Pre-Consumer Recycled Content 604.1(2) Use recycled content products in major areas such as walls, floor, insulation and roofing.
FSC® Certification 606.2(3) Wood or wood-based products available that are certified by Forest Stewardship Council™.
Other Certification 606.2(6) Wood-based components certified in accordance to CPA ECC 4-11.
Low Formaldehyde/VOC Emissions 901.4(a) In compliance with ANSI A208.1.
Low Formaldehyde/VOC Emissions 901.4(c) In compliance with CPA ECC 4-11.
Low Formaldehyde/VOC Emissions 901.4(d) Composite wood contains no urea formaldehyde.








CARB Credits Description
California Air Resource Board C.A.R.B. In compliance with CARB phase 2 requirements.

Safety & Sustainability

Formaldehyde Emissions

All UltraStock MDF panels are recognized by the California Air Resources Board (CARB) as no added formaldehyde (NAF) products by Executive Order N-15-021a.

MR50 Designation

Based on ANSI A208.2-2016 section 3.6, the moisture-resistance test criteria necessary to obtain an MR50 board designation are:
  • Product samples must maintain the 24-hour thickness swell test value of 5.5% or less
  • Samples must maintain an advanced bond integrity value measured as 50% of the original MOR specification for that product grade after accelerated aging.


The accelerated aging process subjects board samples to six complete cycles that include:
  • Immersion in water at 120° ±3° F for 1 hour
  • Exposure to steam and water vapor at 200° ±5° F for 3 hours
  • Freezing at 10° ±5° F for 20 hours
  • Heating to 210° ±3° F in dry air for 3 hours
  • Exposure again to steam and water vapor at 200° ±5° F for 3 hours
  • Heating to 210° ±3° F in dry air for 18 hours


After the six cycles are completed, the specimens shall be conditioned at 68° ±6° F and a relative humidity of 65 ±2% for at least 48 hours before the MOR testing.

Specifications

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