NOVELTY - A mixture (M1) for the stabilization of a polypropylene-based thermoplastic polymer comprises a tetrakis(2-(3,5-di-tert-butyl-4-hydroxyphenyl)ethyl carbonyloxymethyl)methane (I), a tri(2,4-di-tert-butylphenyl)phosphite (II) and a tocopherol compound (0.0001-20% based on the total weight of the mixture (M1)).    USE - As a stabilizer for a polypropylene-based thermoplastic polymer against oxidative, thermal or light-induced degradation and for manufacturing shaped articles (claimed) e.g. film, pipe, profile, bottle, tank or container, fiber, floating devices, automotive applications such as bumpers, dashboards, battery, instrument panel, road traffic devices such as sign postings, car accessories, warning triangles, medical cases, helmets, tires, devices for plane, railway, motor car, devices for space applications such as rockets and satellites, devices for architecture and design, mining applications, street refuges, and shelters, devices for electronic industry such as insulation for plugs, printed boards, and materials for electronic data storage such as chips, check cards or credit cards, electric/electronic devices such as personal computer, telephone, portable phone, printer, washing machines, tumblers, ovens, wire, cable, technical articles such as cogwheel (gear), slide fittings, spacers, screws, sanitary articles such as shower cubicles, lavatory seats, covers, and sinks, hygienic articles such as diapers, feminine hygiene articles, shower curtains, brushes, mats, tubs, mobile toilets, tooth brushes, and bed pans, storage systems such as boxes (crates), luggage, chest, household boxes, pallets, cartridges, syringes, medical applications, containers for any transportation, waste baskets and waste bins, extrusion coating (photo paper, pipe coating), sports and fitness devices such as gymnastics mats, ski-boots, inline-skates, skis, furniture such as cushions, sponges, dish clothes, mats, garden chairs, stadium seats, tables, materials for optical and magnetic data storage, kitchen ware, cassettes and video tapes, footwear, and devices of filled polymers.    ADVANTAGE - The stabilization mixture provides superior processing stability in terms of melt flow rate (MFR) and yellow index (YI) retention after multiple pass extrusion of polypropylene-based thermoplastic polymers in low concentrations. The tocopherol compound in the stabilizer mixture is particularly suitable for high-temperature applications (preferably 300 degrees C), thus technical materials and molded articles based on polypropylene-based thermoplastic polymers, such as pipes and their technical variants (fittings), can be manufactured with a higher output and fewer rejects; and also the stabilizer mixture is used in a very small amount, which results in a reduction in the overall antioxidant concentration compared with conventional stabilizer mixtures, which at the same time represents an economic advantage.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following    (1) a composition (C1) comprising a polypropylene-based thermoplastic polymer which is susceptible to oxidative, thermal or light-induced degradation, and the mixture (M1);    (2) a masterbatch composition (C2) comprising the stabilizer mixture (M1) and a thermoplastic material which is identical or compatible with the polypropylene-based thermoplastic polymer to be stabilized; and    (3) stabilizing the polypropylene-based thermoplastic polymer against oxidative, thermal or light-induced degradation involving incorporating in it or applying to it the mixture (M1).