Soundproof Windows and Window Insulation Technical Data
Magnetite, the magnets used to seal Castle Window Covers in place, have been rigorously tested by independent laboratories on every aspect of performance over a span of 20 years. This is a summary of the results:
Window Insulation "R" Value
INSULATION "R Value" of 4.8 when used in combination with single-pane window, as determined by John M. Yellot Laboratories, Arizona, in tests performed august 5, 1982. Heat loss reduction of 412.5 btu/hr/ft sq (from 687.0 to 274.5) when applied to single pane window. 60% net reduction of heat transfer, as determined by Architectural Testing, Inc., York, PA, in tests performed January 28, 1985.
AIR INFILTRATION Less than .01 cfm/lineal foot crack space, compared to DOE standard for storm windows of 2.0. Tested with 25 mph wind equivalent at The Associated Laboratories, Dallas, TX, using ASTM E-283 test method. Similar results at the John M. Yellott Laboratories above.
Window Soundproofing and Sound Control
SOUND CONTROL STC rating improves from 18 to 28 when 1/8th" acrylic is added to a single hung window using Magnetite. 19.2 sound decibel reduction, effective in 1000 Hz range. As determined by Riverbank Acoustical Laboratories, Illinois, in tests performed April 22, 1988. An STC rating of 41 can be achieved when ¼" acrylic is added to a single hung window using Magnetite.
Block Ultraviolet (UV) Rays
UV CONTROL Ultraviolet light waves are reduced by 98% when passing through special acrylic sheet. As determined by DSET Laboratories, Inc., Phoenix, AZ, in test performed October 31, 1986.
Acrylic Insulation vs. Glass Insulation
GLASS VERSUS ACRYLIC THERMAL RESISTANCE COMPARISON Glass: 5 to 6 btu/hr/sq ft/°F, according to CRC Handbook of Chemistry. Acrylic: 0.7to 1.7 btu/hr/sq ft/°F, according to Handbook of Plastics. (Indicates that acrylic is 3 to 8 times more thermally insulating than glass)
Magnetic Holding Force
MAGNETIC HOLDING FORCE 12.0 lb/lin. Ft, commercial grade 9.0 lb/lin. Ft, residential grade according to Manufacturer.
Resistance to Yellowing and Discoloration
YELLOWING AND DISCOLORATION Optical Grade Acrylic contains no styrene or other monomers that will deteriorate, causing yellow, cracking and checking. Through both laboratory and actual outdoor testing over the last 30 years, 100% Optical Grade Acrylic has been proven again and again not to yellow, crack or check.