Backing Type
    Backing Type
    PlainAdhesive
    Wool Felt Grade
    Wool Felt Grade
    F1
    F3
    F5
    F13
    S2-20
    F7
    F10
    F26
    S2-24
    S2-32
    Hardness Rating
    Hardness Rating
    Soft
    Firm
    Hard
    Pressure to Compress 10%
    Pressure to Compress 10%
    1 psi
    3 psi
    4 psi
    6 psi
    13 psi
    21 psi
    58 psi
    86 psi
    121 psi
    Wool Fiber Content
    Wool Fiber Content
    45%
    75%
    80%
    85%
    95%
    100%
    DFARS (Defense Acquisition Regulations Supplement)
    DFARS (Defense Acquisition
    Regulations Supplement)