Materials and methods for mitigating passive intermodulation. A membrane for reducing passive intermodulation includes a first polymeric layer, a second polymeric layer, and a continuous metal layer encapsulated between the first and second polymeric layers. A self-adhesive radio frequency barrier tape includes a waterproof polymeric top layer, a metal-containing layer adhered by an adhesive layer to the polymeric top layer, a pressure sensitive adhesive layer adhered to the metal-containing layer, and a release liner on a bottom surface of the pressure sensitive adhesive layer. A method of mitigating passive intermodulation includes passing a probe over an area of interest, the probe being sensitive to an intermodulation frequency of interest, and identifying a suspected source of passive intermodulation when the amplitude of the probe output exceeds a threshold at the frequency of interest. The method further includes covering the suspected passive intermodulation source with a radio frequency barrier material.

Materials and methods for mitigating passive intermodulation. A membrane for reducing passive intermodulation includes a first polymeric layer, a second polymeric layer, and a continuous metal layer encapsulated between the first and second polymeric layers. A self-adhesive radio frequency barrier tape includes a waterproof polymeric top layer, a metal-containing layer adhered by an adhesive layer to the polymeric top layer, a pressure sensitive adhesive layer adhered to the metal-containing layer, and a release liner on a bottom surface of the pressure sensitive adhesive layer. A method of mitigating passive intermodulation includes passing a probe over an area of interest, the probe being sensitive to an intermodulation frequency of interest, and identifying a suspected source of passive intermodulation when the amplitude of the probe output exceeds a threshold at the frequency of interest. The method further includes covering the suspected passive intermodulation source with a radio frequency barrier material.

A flexible pavement structure comprises a surface layer, a base layer, a sub-base layer, and a subgrade layer. Herein, the surface layer is adjacent to and above the base layer, and the sub-base layer is adjacent to and above the subgrade layer. The flexible pavement structure further comprises a layered system composed of first, second, and third materials different from each other, and is disposed as an interface layer between the base layer and the sub-base layer. The first material is a geotextile fabric selected from a group consisting of polypropylene and polyethylene, providing ground stabilization or reinforcement properties. The second material is a waterproof heat insulation material selected from a group consisting of cross-linked polyethylene foam and laminated aluminum foil, providing waterproofing or impermeability properties. The third material is a glass foamed insulation material.

A roofing shingle (20) comprises a web (22) of roofing material configured with a first series of sealant material sites (60) and a second series of sealant material sites (62) provided on the roofing shingle (20). The web (22) of roofing material is configured with a length dimension (L) and a width dimension (W). The sealant material sites 60 of the first series are provided along a first axis (66) which is essentially parallel to the length dimension of the web. The sealant material sites (60) of the first series are discontinuous along the first axis (66) and separated from one another along the first axis by a first interval (70). The sealant material sites of the second series (62) are provided along a second axis (68) which is essentially parallel to the length dimension of the web and spaced apart from the first axis (66) with respect to the width dimension. The sealant material sites (62) of the second series are discontinuous along the second axis (68) and are separated from one another along the second axis (68) by a second interval (72), the second interval (72) being different than the first interval (70).

A roofing shingle (20) comprises a web (22) of roofing material configured with a first series of sealant material sites (60) and a second series of sealant material sites (62) provided on the roofing shingle (20). The web (22) of roofing material is configured with a length dimension (L) and a width dimension (W). The sealant material sites 60 of the first series are provided along a first axis (66) which is essentially parallel to the length dimension of the web. The sealant material sites (60) of the first series are discontinuous along the first axis (66) and separated from one another along the first axis by a first interval (70). The sealant material sites of the second series (62) are provided along a second axis (68) which is essentially parallel to the length dimension of the web and spaced apart from the first axis (66) with respect to the width dimension. The sealant material sites (62) of the second series are discontinuous along the second axis (68) and are separated from one another along the second axis (68) by a second interval (72), the second interval (72) being different than the first interval (70).

Various embodiments disclosed relate to a composite shingle. The composite shingle includes a particle layer and a polyketone layer proximate to the particle layer.

A composite comprising (i) a pressure-sensitive adhesive component including first and second planar surfaces; (ii) a fire-resistant fabric adhered to the first planar surface; and (iii) a cap layer disposed on said fire-resistant fabric opposite said asphaltic component.

A thermoplastic composite article comprising a porous core layer and an open cell skin disposed on a first surface of the core layer is described. The composite article comprises a noise reduction coefficient of at least 0.5 as tested by ASTM C423-17 and a flame spread index of less than 25 and a smoke development index of less than 150 as tested by ASTM E84 dated 2009.

A thermoplastic composite article comprising a porous core layer and an open cell skin disposed on a first surface of the core layer is described. The composite article comprises a noise reduction coefficient of at least 0.5 as tested by ASTM C423-17 and a flame spread index of less than 25 and a smoke development index of less than 150 as tested by ASTM E84 dated 2009.

A sound insulating material, a sound insulating plate, and a partition structure of a train carriage are provided. The sound insulating material comprises the following components in weight ratio: 2-8 parts of tricalcium silicate; 4-10 parts of calcium hydroxide; 10-30 parts of aluminosilicate; 4-10 parts of alumina; 5-15 parts of iron oxide; 10-30 parts of a binder; and 5-10 parts of a curing agent, wherein the binder is at least two of lithium silicate, sodium silicate and calcium silicate; the curing agent is at least one of lithium oxide, magnesium oxide and silica; and the mixture of the aluminosilicate, alumina and iron oxide expands at 1000° C.-1350 ° C. to form particles. The sound insulating plate made of this material is lightweight and has a sound insulation capacity of 35-42 dB.