methodology Zhik Isotak fabrics have consistently proved substantially more waterproof than the current market-leading PTFE ocean fabric. In practical terms, the Isotak fabric takes 120 minutes to degrade to a similar level as the ‘rival product’ has reached in just 30 minutes. So four times more ‘waterproof durable’.
in the last Volvo Ocean Race, who wanted something to help them cope better with the firehose of water that hits them at high speed in strong wind and big waves. The hood and visor also stows neatly behind the head so it is easily accessed and deployed with one hand,’ says Hussey. 2. Zhik adaptive hood collar system – Smock and drysuit. ‘This is an adaptable collar/zip-on, zip-off hood for the Isotak X Drysuit and Reziseal Smock,’ says Hussey. ‘We had been experimenting with the idea for a couple of years prior to our partnership with AkzoNobel and Dongfeng. The main advantage is that the crews can carry one smock that is adaptable to all the expected conditions. It can be worn with full ocean collar or with various other collar designs and accessories such as Zhik’s waterproof hoods, and the Avlare or Neoprene balaclavas. With conditions capable of varying from one extreme to the other on a single race leg having versatile clothing is a big advantage.’ 3. Reziseal composite seals – Smock, drysuit and jacket (wrists only on jacket). ‘These are polyurethane and high-stretch textile composite constructed into a soft, stretchable and comfortable waterproof seal,’ says Hussey. ‘They’re worlds apart from the sticky latex seals that wear out and deteriorate so quickly. The textile composite has excellent tear
Left: Zhik’s proprietary Reziseal is both more waterproof due to the extended contact area with the skin and also less constricting than the traditional tighter
Neoprene drysuit-type seal solution. Zhik continue to make (top) extensive use of the fabric waterproof- ness testing system they are still refining, working in partnership with the Royal Melbourne Institute of Technology. Coming up with new, lighter and more flexible offshore clothing systems is not the biggest challenge, making them waterproof and, more importantly, waterproof for extended rugged use, that is the hard part and where a smart but practical approach to material and garment
testing comes into its own
resistance and does not break down, so they also have significantly longer life than latex seals.’ Hussey points out that they are also easier to repair, although the need for repairs are less likely in the first place. The seals provide excellent waterproofness and now with greatly improved comfort.
Four times more waterproof durable Zhik has been working closely with the Royal Melbourne Institute of Technology (RMIT) to develop a better standard for waterproof durability in textiles. ‘Waterproof durability refers to a textile’s ability to maintain its waterproofness after extended use,’ says Hussey. Hydrostatic head testing is the commonly used method to rate the waterproofness of a fabric. While this method provides a good indication of initial waterproofness before use, it does not indicate how the textile will maintain its waterproofness through its active life. In fact, there is currently no industry standard method that simulates the high levels of wear in wet conditions that is experienced by offshore foul weather gear. So RMIT helped pioneer the development of a waterproof durability testing method specifically designed to simulate accelerated wear and tear in wet conditions (when the waterproof membrane is most vulnerable). This method involves placing waterproof textiles in an accelerated wear device that simulates impact and abrasion in wet conditions. Each textile is pressure-tested to determine the waterproofness after defined intervals. Thirty minutes of accelerated wear indicates about 14 days of extreme offshore use. Using the new testing
And breathable? The Holy Grail for offshore garments is to make them waterproof, durable and breathable. Current research confirms that while all of the best-known currently available breathables breathe – to varying degrees – in each case you still sweat when you work hard. RET is a measurement of resistance to evaporative heat loss, measured using a device called a sweating hotplate. ‘Of the standard industry testing we believe this is now the best method to compare the breathability of waterproof and breathable fabrics,’ says Hussey. Zhik recently commissioned independently managed RET tests at TTRI Laboratories on numerous offshore breathable fabrics – our own and those of the competition; the tests at TTRI showed that despite the significantly higher durability of Isotak X it reliably matches the best competing products for breathability. This is no mean technical achievement.
Lower RET number equals higher levels of breathability Testing is conducted using a sweating guarded-hotplate to ISO 11092 standard. This method uses a sweating ‘skin model’ in a climate-controlled cabinet to measure resistance to evaporative heat loss (RET). The lower the RET value, the less resistance to moisture transfer and therefore higher breathability. l 0-6 (extremely breathable) l 6-13 (very breathable) l 13-20 (moderately breathable) l 20-30 (slightly breathable) Hussey concludes: ‘All Isotak products are configured to have a high level of breathability and very high level of waterproof durability. ‘It’s true that they are slightly
less breathable than our Aroshell inshore range, which is optimised for maximum breathability but has slightly lower waterproof durability. But Isotak breathability is in the same RET range as our competitors’ products (6-13) although it offers far greater levels of waterproof durability as these independent tests by RMIT have now shown.’
www.zhik.com
q SEAHORSE 55
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