Norland International’s LDPE caps for 5-gal. water bottles, sold under the Earth Cap trade name, contain a proprietary additive that accelerates the degradation process.
Total degradation occurs in 5 to 10 years. The injection molded Earth
Cap--a replacement for traditional LDPE caps--also features a
biodegradable non-adhesive tamper-evident label and 2-mm foam seal,
making the entire cap structure totally biodegradable. Caps have a
2-year shelf life and offer the same performance as current versions.