Fiberglass density barely affects absorption but strongly affects mechanical strength

Evidence

Not stated is the important fact that the density of the fiberglass board has negligible effect on the absorption coefficient, but a large effect on the mechanical strength. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1370

Categorization

• XREF: Connects to Figure 12.23 finding that two different fiberglass densities measured essentially the same acoustic behavior. — connects to: High fiber density and generous surface area drive porous material absorption; Medium density and elasticity shape the pressure-velocity amplitude relation — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 165
• SHARE: For someone building room treatment panels or an anechoic chamber — density choice is about strength and cost, not acoustics.
• corroborated: 2 independent passages support this claim — Toole, Floyd E, Sound reproduction- the acoustics and…, 1370

Broader Connections

• High fiber density and generous surface area drive porous material absorption #complicates (0.85)
• Medium density and elasticity shape the pressure-velocity amplitude relation #expands (0.75) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 165