Acoustic nonwoven fabric for perforated ceiling elements

A ply having a base weight of not more than 45 g/m2 for use in a ceiling element comprising:

• a fiber blend in a proportion of not more than 30 g/m2;
• and
• a flame retardant in a proportion of not more than 10 g/m2.

An acoustical nonwoven having a basis weight of less than 60 g/m2 for metal ceilings comprising:

• a ply having a base weight of not more than 45 g/m2 and including a fiber blend in a proportion of not more than 30 g/m2 and a flame retardant in a proportion of not more than 10 g/m2;
• and
• an adhesive material in a proportion of less than 15 g/m2.

An assembly comprising:

• a ply having a base weight of not more than 45 g/m2 and including a fiber blend in a proportion of not more than 30 g/m2 and a flame retardant in a proportion of not more than 10 g/m2;
• and
• an uncoated perforated metal ceiling element, wherein the assembly exhibits in a measurement according to DIN EN 13823 a SMOGRA value of not more than 30 m2/s2 and a TSP(600s) value of not more than 50 m.

An assembly comprising:

• an acoustical nonwoven having a basis weight of less than 60 g/m2 for metal ceilings including a ply having a base weight of not more than 45 g/m2 and including a fiber blend in a proportion of not more than 30 g/m2 and a flame retardant in a proportion of not more than 10 g/m2 and an adhesive material in a proportion of less than 15 g/m2;
• and
• an uncoated perforated metal ceiling element, wherein the assembly exhibits in a measurement according to DIN EN 13823 a SMOGRA value of not more than 30 m2/s2 and a TSP(600s) value of not more than 50 m.