All of the following are characteristics of an ideal shielding material for lead paint surfaces except ____.

The ideal shielding material for lead paint surfaces should possess specific characteristics that ensure effective protection and safety. High density and mass are critical properties for a shielding material because they help to effectively prevent lead dust and particles from becoming airborne and settling in environments where exposure could occur.

When evaluating the remaining characteristics:

• Being vermin-proof is essential, as a shielding material should prevent pests from nesting or burrowing into it which could compromise the integrity of the shield.

• Low cost is also an attractive trait for any materials used in practical applications, especially considering budget constraints and the scale of use in various settings.

• Non-toxic is vital to ensure that any materials used alongside lead paint do not introduce additional health risks.

Therefore, focusing on high density and mass as a distinguishing characteristic highlights the primary function needed to safely shield against lead exposure.