Sarda Plywood Industries Ltd. Manufactures Door with Solid Filling Materials. Sarda Plywood Industries Ltd. Manufactures Paper and Tea besides Plywood and allied products. The Door with Solid Filling Materials is eco- friendly as the honeycomb core is made from polymer impregnated recycled Kraft paper. Varied climatic conditions do not affect the performance of as atmospheric moisture cannot penetrate into the core. The Door with Solid Filling Materials comes under the brand name "Durodoor-Lites". The Door with Solid Filling Materials has excellent sound absorption qualities. The honeycomb pattern in the core reduces the direct transmission of sound by absorption, which are expressed as sound transmission class [STC].