Knowledge Base

Due to the complex production process of our plastic tanks (rotational moulding process in special manufactured steel/aluminium moulds), it is unfortunately not possible to manufacture an individual tank with your desired dimensions. Due to cost reasons and the corresponding effort/expenses of making the mould, this is only profitable for larger quantities.
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Our Plastic Tanks are UV-resistant and also designed for outdoor use. For large-volume tanks from 5.000L on, a safe stand, e. g. on a reinforced concrete slab, is recommended.
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Of course, other liquids and chemicals can also be stored in the tanks. You can see the resistance of various materials in the resistance list on the product pages of the tanks. For chemicals, acids and alkalis, please note the respective concentration of the fluid.
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The plastic tanks are designed for the permanent use of water temperatures from 0-60°C. The tanks can also withstand temperatures of up to 70°C for short periods of time. The water in the tank should not freeze, as it will then expand and damage the plastic tank.
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Yes, our tanks are suitable for drinking water. The semi-transparent/natural watertanks are certified according to WRAS (Water Regulations Advisory Scheme - UK). The blue PE-Tanks are certified as food-safe according to Regulation (EC) 1935/2004.
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In most cases the indicated dimensions refer to the pure container size, the height of the lid is not considered here. The exact dimensions, e. g. height including lid, width of the notches or distances of the baffles etc. can be found on the respective product page of the technical drawing of the tank.
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Baffles are mainly installed on our medium to large-volume, semi-transparent plastic tanks. These prevent the water in the tank from sloshing during movement and portable use. In addition, the permanently installed baffles give the container rigidity and thus contribute to an optimised stability.
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Of course, the plastic tanks are also used in vehicle construction and building into caravans. Especially our narrow or flat semi-transparent plastic tanks are suited for installation in a vehicle, depending on the space available and the intended use. The possibility for further connections for inlets, outlets or overflows as well as venting - through PVC accessories or through additional HDPE fusion sockets (welding sleeves) - offers a great advantage and is highly appreciated by our customers.
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As we offer many different plastic tanks and the corresponding frame should not be adjusted to the individual tank but to the individual installation conditions, we generally do not offer frames. We recommend an individual formwork with e. g. L-profiles. Furthermore, the existing notches can be used for fastening with tension straps. It is not recommended to fix the tank completely through the baffles, as this is the “least stable” point on the tank.
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We recommend using the existing brass connection for the connection because it is installed at the lowest possible point of the tank. Depending on the available space, portable use of the tank a “flexible" connection has proven its worth. This can be easily installed using hose nozzles and a connecting piece of hose. For safety/space reasons, it often makes sense to guide the connection along the tank wall with an angle of 90 degrees. Especially in portable use a flexible connection better resits occurring vibrations, and thus prevents possible damage/breaking of connections.
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Ventilation is recommended to ensure air exchange during filling and emptying of the tank. If there is not enough air exchange, over- or under-pressure can form and damage the tank. A vent can be installed independently at the desired location with our Tank Connection Sets (or Vents) in different sizes. We recommend to lead a piece of hose upwards and to fasten it securely.
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Our plastic tanks are not designed as pressure tanks. The tanks are dimensionally stable up to at least 0.8 bar. The containers should not be permanently under higher pressure to prevent deformation and excessive stress on the material.
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In contrast to steel tanks, a slight expansion/deformation cannot be ruled out completely; however, it is absolutely harmless and will not lead to permanent deformation. The baffles and the wall thickness of 6 mm or 8 mm counteract this, and the tank will stay in its shape. An expansion can be lowered by chasing/shuttering at installation.
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The Watertanks are made of PE-MD, the PE-Tanks are from LLD-PE or LHD-PE. Due to its density, it is very difficult to combine it with other materials. For bonding please pay attention to the compatibility with PE. You will find the appropriate products for gluing in specialist shops.
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The plastic tanks are not suitable for use with petrol. Diesel, on the other hand, can be stored without any problems. If you wish to use the tanks for storing diesel, please inform us accordingly so that we can attach diesel-resistant rubber rings to the tank lids. Please inquire about the general legal regulations and insurance aspects of diesel storage on your private property.
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External vent is recommended for vehicle installation. The vents in the lid are designed for static use.
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The lid is suited to be on the topside of the tank. Using it upside down will cause the tank to leak fluid.
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There is always a brass connection on our semi-transparent plastic tanks. If you order this "drilled", it will be drilled out (opened) after production. The connection is so useable, and you can attach additional accessories like our Brass Tank Connection Sets to the internal thread of the brass connector/outlet. The liquid will get into contact with the brass connection. If you order the tank with an "undrilled" connection the brass connection is also available on the tank, but not drilled out/through (so it will be closed). This means that the brass connection is completely covered with plastic from the inside and does not get into contact with the stored liquid. The connection is completely closed, and no extra plug is required for closing the connection. If necessary, you can drill the connection by yourself with a hole circle drill and use it normally.
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In addition to the permanently installed brass connection, you can use our PE or PVC Connections-Sets in sizes of ¾ inch to 2 inches to install your own alternative connection. Please note that the desired place must be accessible via the lid. If you need additional connections in places that are not accessible via the lid opening, we can fit HDPE fusion sockets (welding sleeves with internal thread) to all semi-transparent plastic tanks.
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Our blue PE-Tanks are always delivered without connections. Of course, you can also install connections in ¾ inch to 2 inch with our plastic accessories in the intended connection fields. These are located at the top (usually inlet) and bottom (usually outlet) of the respective tanks. If no connection fields are available, e. g. RPRK, RPRKH, RPRKV, you can also install accessories in all desired places likewise on the semi-transparent water tanks.
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With our Tank Connection Sets or our PVC- and PE-Connections, you can easily install an additional connection for inlet, outlet or overflow on the plastic tank. For preparation, drill a hole of the required size in the desired place in the tank. To assemble, unscrew the nut and remove the white ring. Now push the connection with the black rubber seal from the inside of the tank through the prepared hole. From the outside of the tank, place the white ring and tighten the union nut. Please note that the desired connection place can be reached via the inspection opening/lid. For the adaptation, wrap the thread with Teflon tape (approx. 6 windings clockwise) and screw on further articles (e. g. tap, sleeve and hose nozzle). Now you can push the hose on and fix it with the appropriate hose clamp.
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Spin Weld Outlets are additional plastic internal threads which are welded to the tank wall after the tank is produced. These can function as alternative connections, if the desired position for a connection is not accessible/reachable via the cover opening/lid.
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Spin Weld Outlets can only be attached to our semi-transparent tanks as ½ inch to 2 inch female thread connections. Please mark the position and size of the connections in the technical drawing of the desired tank and send it to us by e-mail. The technical drawing with the exact tank dimensions can be found on the product page as a PDF file. Further information about sizes and a step by step description on how to order HDPE Fusion Socket on our tanks  you can find here: Spin Weld Outlets and on the article description of a Spin Weld Outlet itself.
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Connections available in our web shop have to be wrapped with teflontape (PTFE). Some articles from the Gardena system, are with sealing rings, this depends on the version.
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A connection of Ø 40mm is mostly standard for the water supply via an external flap installed in the wall of caravans or mobile homes.
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Basically, we treat each order separately and ship it separately from other orders
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As a registered customer, you can view the current status of your order in your customer account and view the shipment history for parcels by tracking provided from our shipping partners DPD or DHL. If you have placed a guest order (without a customer account), you will receive a tracking code by e-mail from DPD or DHL. Tracking is not possible for not parcelled shipments (pallet shipment or large volume tanks). However, the shipment will be notified to you beforehand by telephone.
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After complete processing and payment of the order a collection in our warehouse in Rotterdam is possible. This is only possible after previous arrangement. The address you will find in contact & addresses.
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If you have received a broken product or incomplete delivery, please contact us immediately by e-mail: info@rotterdamplastics.nl. The subject of the e-mail should contain the following: Complaint about order (your order number) Please briefly describe the facts and send us pictures of the broken/wrong delivered articles.
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Info about Instructions on cancellation for private customers you find at Right to cancel
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Our shipping costs are based on weight, dimensions and loading meters of the shipment and the country the delivery is send to. Our shipping costs include packaging and delivery costs. Depending on weight and size a shipment will be send as a package, a pallet or as a carrier shipment
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We are you are obliged to check your VAT ID. To place an order without the German VAT, please create a customer account and place your order after log in. We are sorry, but changes afterwards are not possible anymore.
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In this case you will receive an estimated delivery date after the goods have been handled. As private person, you will be contacted by phone and an appointment will be arranged. It is important to fill in a correct telephone number by placing the order, on which you are reachable.
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We are constantly trying to provide you with further shipping options. Many destinations are available. Please check the shopping cart when ordering, whether your desired country is already available. If not, please contact us.
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