This Standard specifies requirements for the classification, performance and labelling of knitted and woven shade fabrics for horticultural and human protection applications.Requirements include the following:(a) Measurement of the cover factor of a shade fabric using a standard instrument. (For horticultural applications.)(b) Cover factor ranges for different categories of shade fabric. (For horticultural applications.)(c) Minimum strength requirements for shade fabric both before and after a set period of exposure to light.(d) A method for the determination of transmittance of ultraviolet and visible radiation.(e) A method for the measurement and calculation of ultraviolet effectiveness (UVE). (For human protection applications.)(f) Methods for the calculation of the average percentage transmittance, the shade factor, the average percentage UVR transmittance, the percentage UVR block and the average percentage PAR transmittance. (For horticultural applications.)(g) A method for the determination of resistance to degradation by light in Appendix C.(h) Determination of mass per unit area.(i) Determination of solar radiation transmittance.(j) Determination of flammability properties.(k) Labelling requirements.NOTE: Guidelines to assist in designing shade structures can be found in Appendix F.

Originated as AS 4174—1994.Second edition AS 4174:2018. Originated as AS 4174-1994. Second edition AS 4174:2018. Reissued incorporating Amendment No. 1 (August 2019).