SDC phenolic yellowing

Product:

4220 SDC Phenolic Yellowing Control Fabric 10 x 3cm ( 25 piece pack)

4222 SDC BHT-Free 63 Micron Film 400mm x 200mm (100 sheet)

4225 SDC Phenolic Yellowing Test Papers (50 piece pack)

4227 SDC Phenolic Yellowing - Glass Plates 100 x 40 x 3mm (10 piece pack)
Brand: SDC
Origin: UK
Function: test for yellowing of fabrics, fibers
Standard:

EN ISO 105 x 18:2007      M&S C20B

EN ISO X18                        Next TM43