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  2. Noise reduction coefficient - Wikipedia

    en.wikipedia.org/wiki/Noise_reduction_coefficient

    This rating is common of thicker, porous sound absorptive materials such as 2-inch-thick (51 mm) fabric-wrapped fiberglass panel. Materials can achieve NRC values greater than 1.00. This is a shortcoming of the test procedure and a limitation of how acousticians define a square unit of absorption, and not a characteristic of the material itself.

  3. Sound transmission class - Wikipedia

    en.wikipedia.org/wiki/Sound_transmission_class

    Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. Outside the US, the ISO Sound Reduction Index (SRI) is used.

  4. Barcol hardness test - Wikipedia

    en.wikipedia.org/wiki/Barcol_hardness_test

    The Barcol hardness test characterizes the indentation hardness of materials through the depth of penetration of an indentor, loaded on a material sample and compared to the penetration in a reference material.

  5. Glass fiber reinforced concrete - Wikipedia

    en.wikipedia.org/wiki/Glass_fiber_reinforced...

    GRC (Glass fibre-reinforced concrete) ceramic consists of high-strength, alkali-resistant glass fibre embedded in a concrete & ceramic matrix. [1] In this form, both fibres and matrix retain their physical and chemical identities, while offering a synergistic combination of properties that cannot be achieved with either of the components acting alone.

  6. FR-4 - Wikipedia

    en.wikipedia.org/wiki/FR-4

    FR-4 is a composite material composed of woven fiberglass cloth with an epoxy resin binder that is flame resistant (self-extinguishing). "FR" stands for "flame retardant", and does not denote that the material complies with the standard UL94V-0 unless testing is performed to UL 94, Vertical Flame testing in Section 8 at a compliant lab.

  7. G-10 (material) - Wikipedia

    en.wikipedia.org/wiki/G-10_(material)

    G-10 or garolite is a high-pressure fiberglass laminate, a type of composite material. [1] It is created by stacking multiple layers of glass cloth, soaked in epoxy resin, then compressing the resulting material under heat until the epoxy cures. [2] [3] It is manufactured in flat sheets, most often a few millimeters thick.

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