Pipe Fitting Insulation, Insulation Material Melamine, Installation Style Hinged, Inside Diameter 1 5/8 in, Wall Thickness 1 1/2 in, Form Tube, Minimum Operating Temperature -40 Degrees F, For Copper Tube Size 1 5/8 in, Maximum Operating Temperature 350 Degrees F, R Value 9.9, Color Gray, For Pipe Size 1 1/4 in, Flame Spread Index 25, Foam Cell Type Open, Plenum Rating Plenum Rated, Flexibility Flexible, Standards ASTM E84 25/50, Clean Room Class Not Applicable, For Environment Clean Room