Antidegradants in DIY Compounds: Retarding Failure You Cannot Prevent
Not a recipe article. phr tables live in deep dives. More antioxidant is not always better — staining, bloom, and cost trade-offs are real.
Executive summary
Handbook law: latex article degradation cannot be prevented — only retarded; heat, humidity, UV, ozone, oxygen, oils, metals, and stress co-drive failure. Liquid latex work DIY compounds for wearable film should plan 0.5–2 phr antioxidant for thin goods, with amine vs phenolic stain trade-offs.
Use this when compounding liquid latex film intended to last beyond a single event — after reading Aging, Storage and Care. Sheet-based work buyers inherit the mill’s antidegradant package unless vendor TDS discloses it.
The retardation law
Degradation cannot be prevented — only retarded; drivers include heat, humidity, UV, ozone, oxygen, chemicals (acids/bases, oils, solvents, oxidizers, heavy metals), and stress. Three oxidative modes run together: chain scission (soft/tack), crosslinking (harden), chemical alteration.
How do crack patterns differ by cause?
Ozone cracks are oriented and widespread. Flex cracks are oriented but local. UV cracks are non-oriented over the exposed area. Map what you see before blaming “old glue.”
DIY compounding budget (liquid latex work)
Add efficient antioxidant to most latex compounds, typically 0.5–2 phr, especially thin-walled products. Most latex products use 1–2.0 phr total antioxidant in handbook antidegradant chapters. Amine antioxidants are more effective but discolor; phenolics are less effective but lower stain.
Match antidegradant package to storage + wear environment (ozone motors, UV, metal hardware) per Aging, Storage and Care — do not copy glove-factory phr blindly.
More antioxidant is not always longer life — stain, bloom, and dynamic ozone needs contradict one-size-fits-all.
See Pigment & Filler Decks for metal-catalysis interaction with pigments.
Deep dives (optional)
Deep dive: Ozone vs wax vs PPD strategies
Microcrystalline wax 0.5–1.0 phr: static ozone barrier after continuous bloom; flex/stretch cracks bloom. PPD-type antiozonants ≥2 phr, often 3 phr for dynamic ozone; stain dark. Wax helps static storage ozone; flexing wear needs PPD-class thinking.
Deep dive: Warehouse heat stacking
Handbook example: warehouse floor–ceiling temperatures ~35–60 °C in warm months; oxidation rate doubles per 8.3 °C rise → ceiling stock can age ~8× floor stock. Avoid sharp folds in storage; UV-exposed faces in plastic discolor. Top shelf above a hot garage ceiling counts as an aging accelerator — antidegradants cannot ignore storage physics.