Table 1 List of tested samples.

From: Analysis of effect of thickness and surface treatment on sound transmission loss characteristics of natural fibres

S. No.

Sample type

Nomenclature

1

Untreated Coir

UC

2

Treated Coir

TC

3

Untreated Sponge Gourd

USG

4

Treated Sponge Gourd

TSG

5

Double Layer Untreated Coir

2UC

6

Double Layer Treated Coir

2TC

7

Double Layer Untreated Sponge Gourd

2USG

8

Double Layer Treated Sponge Gourd

2TSG

9

Triple Layer Untreated Coir

3UC

10

Triple Layer Treated Coir

3TC

11

Triple Layer Untreated Sponge Gourd

3USG

12

Triple Layer Treated Sponge Gourd

3TSG