Fressko Core 300ml Glass Bottle
3 of 7 properties on this product have been measured on our own bench. Everything else on this page is the manufacturer's published specification, labelled as such.
Manufacturer spec vs verified result
| Property | Manufacturer spec | Our measurement | Evidence |
|---|---|---|---|
| Cost per year over five years AUD/year | AUD 34.95 | 6.99 AUD/year n=1 | Derived from price |
| Heat retention over six hours °C at 6h | 0 hours hot | — | Scheduled, not yet measured |
| Hours above drinking temperature hours | Not published | 3.7 hours n=1 · 2026-10-15 | Verified by us |
| Hours cold hours | Not published | 11 hours n=1 · 2026-10-15 | Verified by us |
| Ice retention hours | Not published | 96 hours n=1 · 2026-10-15 | Verified by us |
| Measured empty weight g | 260 g | — | Scheduled, not yet measured |
| Seal integrity (inversion and shake) ml escaped | Leakproof | — | Scheduled, not yet measured |
A claim only counts as verified once we have measured it ourselves under a published protocol. Until then it stays labelled as a manufacturer specification. JSONL · CSV
How each figure is produced
Cost per year over five years
Purchase price spread across a conservative five-year service life, so products of different prices compare directly.
Derived, not measured: recommended retail price divided by five years. Replacement parts and consumables are excluded because they vary by owner. Published alongside measured results so a durability figure can be read against what the product costs to own.
Listed price spread over a five-year service life.
Heat retention over six hours
How hot a filled vessel still is six hours after sealing, measured at room temperature.
Fill to the stated capacity with water at 95 °C, seal, and rest on a wooden bench at 20 °C ±1 °C with no direct sun. Record the internal liquid temperature at 1, 2, 4 and 6 hours with a probe thermometer inserted through the drink opening. The published figure is the six-hour reading.
Equipment: K-type probe thermometer, kettle with temperature control, ambient logger
Hours above drinking temperature
How long a filled vessel keeps a hot drink above drinking temperature.
Fill with water at 95°C, close the lid, leave undisturbed at room temperature, and record the time until the contents fall below 60°C. Single unit, founder-run, not lab conditions.
Equipment: Digital probe thermometer, timer
Founder-run single-unit reading; consistent across the tested Fressko range. Not lab conditions.
Hours cold
How long a filled vessel keeps a cold drink below 10°C.
Fill with chilled water at 4°C, close the lid, leave undisturbed at room temperature, and record the time until the contents rise above 10°C. Single unit, founder-run, not lab conditions.
Equipment: Digital probe thermometer, timer
Founder-run single-unit reading; consistent across the tested Fressko range. Not lab conditions.
Ice retention
How long ice cubes remain visibly intact in a filled vessel.
Fill with ice and cold water, close the lid, leave at room temperature, and check at intervals until no solid ice remains. Single unit, founder-run, not lab conditions.
Equipment: Ice cubes, timer
Founder-run single-unit reading; consistent across the tested Fressko range. Not lab conditions.
Measured empty weight
The weight of the product as it is carried: fully assembled, dry and empty, including the lid and any sleeve supplied in the box.
Assemble the product as sold, ensure it is completely dry inside and out, and place it on a calibrated digital scale zeroed to the bare bench. Record to the nearest gram. Weighed three times with the product removed and replaced between readings; the median is published. Any accessory not supplied in the box is excluded.
Equipment: Digital scale accurate to 1 g, calibrated with a 200 g reference mass before each session
Seal integrity (inversion and shake)
How much liquid escapes a sealed vessel when it is inverted and shaken like a bag commute.
Fill to 90% of capacity with water at 20 °C, close as the manufacturer instructs, invert for 60 seconds, then shake vertically 30 times through a 30 cm stroke. Blot and weigh the escaped water. Repeated three times per sample with the lid reseated each time.
Equipment: Precision scale (0.01 g), absorbent pad, stopwatch