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Glossary
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Block - a term used to identify molded EPS products, usually
modified with a flame retardant additive, destined for end-use in the construction or foam
fabrication markets.
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Board - term used for molded or extruded polystyrene foam when the
product is cut or trimmed to its final dimensions and ready for shipment.
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Boardfoot - common measure in the EPS and XPS industry to signify 1
inch by 1 foot by 1 foot of product.
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Buoyancy - uplift due to hydrostatic (water) pressure.
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Compressible inclusion - a material of lower modulus (geofoam)
placed within or between a fill (soil) and a structural element (wall) to induce movement and
stress distribution.
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Compressive strength - the stress developed at 5 or 10 percent
strain in a uniaxial test.
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Creep - long-term deformation under constant load.
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Density - mass per unit volume.
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Fill - soil or geofoam placed above grade or to back fill an
excavation.
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FPSF - frost protected shallow foundation.
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Geofoam - block or planar low-density cellular plastic foam solids
used in geotechnical applications.
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Geotechnical - an area of civil engineering specialty concerned
with geological materials, earth structures and foundations.
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Initial Modulus - slope of a stress-strain curve at low strain
levels.
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Insulation - a material of high R-value that functions as a heat
barrier.
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Interface friction - a measure of shear resistance at the interface
of two bodies or different materials.
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Internal friction - a measure of shear strength within a material.
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Lateral stress - load per unit area in a lateral direction.
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Light weight fill - fill material of lower density than soil.
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re-Puff - term that refers to pre-expanded polystrene resin beads
prior to block molding or board extrusion.
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R-value - a measure of resistance to heat flow through a unit width
of material expressed in moC/W (hr.ft2.oF/BTU.in).
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Seating error - an initial lag of a stress-strain curve resulting
from non uniform contact.
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Shear modulus - the ratio of shear stress to shear strain.
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Strain rate - deformation per specimen height per time.
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Vertical stress - load per unit area in the direction of gravity.
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