ALKATUFF FREQUENTLY ASKED QUESTIONS
Poly water tanks are a cost efficient way to store rainwater for domestic, industrial or commercial applications. Plastic rainwater tanks will not only save money in the long run due to lower water bills but are also a great way to help the environment. Plastic rainwater tanks don’t rust or taint the water. They are available in a wide range of styles and colours.
The raw material used to manufacture your plastic water tank is called polyethylene. Alkatuff is a unique Australian made brand of polyethylene used to develop plastic water tanks to ensure Australian’s are getting the highest quality product from the beginning. Alkatuff is the only Australian made raw material for water tanks so if it’s not a tank made from Alkatuff, it’s imported.
Why buy a Tank made from Alkatuff?
If your tank is not made from Alkatuff, then it’s not Australian made and is likely made from a resin manufactured in Asia or the Middle East and not specifically designed for Australian conditions.
Alkatuff is the only Australian made poly for water tanks and is made in Botany NSW by Qenos, Australia’s sole manufacturer and leading supplier of world class polyethylene and polymers.
Alkatuff is a Linear Low Density Polyethylene resin specially made for the manufacture of poly water tanks. Alkatuff is manufactured by Qenos, Australia’s sole manufacturer and leading supplier of world class polyethylene and polymers. Qenos supplies Alkatuff resin to compound grinders who add colour to the resin and grind it into powder form suitable for the rotational moulding process. Qenos is not a manufacturer of tanks.
In addition to the properties of the polymer grade being used, the quality of a rotationally moulded polyethylene article is highly dependent upon the characteristics of the powder particles in regard to their size, shape and size-distribution. Alkatuff LLDPE base polymers and compounds are ground in high speed grinding mills to the requirements of the rotational moulding industry. All grades of powder are produced to a manufacturing specification which clearly defines the particle size, the amount of fines present, and the bulk density.
When polyethylene is exposed outdoors, the ultra-violet component of the sunlight causes photo-oxidation of the polymer, resulting in surface crazing and a marked deterioration of the mechanical properties with time.
The standard for UV performance for PE Water Tanks specified in AS/NZS 4766 is 8,000 hours of uninterrupted exposure to an intense and specifically developed UV light source.
Qenos incorporates stabilisers into its rotational moulding resins to provide exceptional weather resistance for outdoor applications. The long term UV performance of the resin is then exhaustively tested under conditions of controlled irradiance, chamber temperature and humidity, and repeated rain cycles.
Alkatuff LL711UV resin achieves a class leading UV performance exceeding 20,000 hours against the required standards, enabling tanks made from Alkatuff LL711UV to be Tough in the Sun.
Qenos is Australia’s sole manufacturer and leading supplier of world class polyethylene and polymers. In 2008, Qenos became a subsidiary of China National Bluestar (Group) Co. Ltd, a joint venture between China National Chemical Corporation (ChemChina) and The Blackstone Group, one of the world’s leading investment firms.
Alkafuff is manufactured by Qenos in Botany NSW.
The Qenos Botany site covers 37 hectares in a major chemical and plastics manufacturing area located next to Botany Bay shipping terminal. The three major facilities at Botany – Olefines, Alkathene and Alkatuff – produce ethylene, low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and high density polyethylene (HDPE). The polyethylene produced is used across a range of industries and applications including consumer and industrial packaging, water conservation, waste management (mobile garbage bins) and agriculture.
Qenos adds value to Australia’s rich oil and gas reserves creating innovative products that promote sustainability across Australian industries. Every day in homes, factories and farms, Australians rely on products made from the polymers and chemicals produced by Qenos. From juice and milk bottles, to mobile garbage bins, pipes and packaging of cleaning products and food, Qenos polymers are everywhere.
Qenos facilities in Melbourne and Sydney draw on technical expertise and productive relationships developed over more than 50 years to deliver solutions for a growing global market. Each year, Qenos contributes more than $1 billion to the Australian economy.
Qenos is proud to be an integral part of Australia’s plastics industry, a major contributor to this nation’s economy, a progressive employer and a safe and responsible member of our local communities.
Alkatuff is an Australian made polyethylene that is specifically engineered for the production of plastic rainwater tanks for Australian conditions. Alkatuff is made with a hexene (C6) co-monomer, giving superior impact strength, stress crack resistance and long term toughness than tanks made with a standard butene (C4) resin.
Alkatuff has more than twice the UV protection specified in the Australian Standard for polyethylene tanks. The Australian Standard for water tanks requires that the material has a UV8 rating while Alkatuff has a rating greater than UV20.
Alkatuff has high thermal stability making it less prone to oxidation, discolouration and loss of toughness making it ideal for use in rotationally moulded tanks produced for the demands of the harsh Australian environment.
Make sure your next tank is made from Alkatuff so you can be sure it’s Tough in the Sun.
Since the early 1990’s, linear low density polyethylene (LLDPE) has come to the fore in rotational moulding applications, because of its outstanding physical properties (excellent environmental stress crack resistance and impact performance) and ease of processing.
Linear Low Density Polyethylene (LLDPE) refers to low density type polymer with a density between about 0.915 and 0.930 g/cm3, made via an HDPE type manufacturing process. LLDPE is a linear molecule with a higher level of short chain branching than HDPE (specifically introduced by polymerisation with co-monomer), but without the long chain branches which characterise LDPE.
Linear polymers including Alkatuff LLDPE have a lower extensional viscosity and show a much reduced tendency to strain-harden. These differences have important implications in the processing behaviour of these polymers. The lower extensional viscosity means that LLDPE is much easier to draw down to thin gauges. Because of its lower melt elasticity, LLDPE has much faster relaxation times and gives lower frozen-in orientation than LDPE. In general LLDPE is expected to give greater impact performance and a much superior environmental stress crack resistance than LDPE. In linear polyethylenes, the distribution and length of the side branches has a profound effect on the environmental stress crack resistance.
C6 is shorthand for the hexene co-monomer used in the Linear Low Density Polyethylene (LLDPE) plastic from which the water tank is made.
In LLDPE, the branching in the molecule is achieved through copolymerisation with monomers such as butene (C4), hexene (C6) or octene (C8). The toughness of the LLDPE is highly dependent on the short chain branch length, which is determined by the co-monomer used. A C6 co-monomer has a longer short chain branch length than a C4 co-monomer, and so on.
The degree of branching increases as the proportion of co-monomer in the polymer is increased. The branching structure will hence depend on the type and proportion of co-monomer, and also the distribution of co-monomer along the molecule (ie. whether the branches are evenly distributed or clumped together). This means that the LLDPE’s supplied by different manufacturers can have noticeably different properties.
In Alkatuff LLDPE, which is a hexene copolymer, the branch points occur every 50 to 100 carbon atoms.