Choosing a reliable boat for fishing or resting on the water often turns into a complex dilemma between comfort, durability and price. low-pressure polyethylene (HDP) is special because of its unique physical properties, and this material, also known as HDPE (High Density Polyethylene), is radically different from conventional PVC, offering a completely different approach to operating and maintaining a boat.
Unlike inflatable counterparts, PHD boats are a solid, unsinkable structure that is not afraid of punctures and sharp objects on the shore. Rotary molding technologyThe hulls, which are used in manufacturing, allow complex geometries to be built without a single seam, which ensures that they are sealed for decades of service, and it is the lack of adhesives that makes them incredibly popular among those who value practicality and minimal time spent preparing for the water.
However, despite the obvious advantages, the material has its own specifications that must be considered before buying or self-assembling. The density of the polymer, its resistance to ultraviolet light and temperature expansions require a careful approach to the choice of components and accessories. In this article, we will discuss all aspects of the use of HDPE in shipbuilding so that you can make an informed decision.
Physico-chemical properties of the PND material
The basis for the production of enclosures is granular polyethylene, which undergoes special treatment at high temperatures. squeezinessIt's a powerful machine that can withstand severe mechanical stress without cracking, and even if it hits a rock or a concrete pier, the hull of the HPD boat is likely to get a dent that can be repaired, while the fiberglass can split.
The chemical inertness of the polymer makes it resistant to combustibles, acids and alkalis, which means that spilled gasoline or oil will not damage the structure of the board, and salty sea water will not cause corrosion, as is the case with aluminum alloys. Temperature range The operation is usually between minus 50 and plus 60 degrees Celsius, which allows the boat to be used in almost any climatic zones.
⚠️ Note: Despite the high heat resistance, it is not recommended to leave the boat from the HDPE under direct sunlight at air temperatures above 40 C without a load (for example, empty on the shore), as thermal expansion can lead to deformation of the bottom geometry.
Important aspect is resistance to ultraviolet radiation. High-quality HDPE for boats always contains special additives-stabilizers to prevent the destruction of polymer chains under the sun. Without these additives, the material would quickly lose its strength and become fragile, so when choosing raw materials or finished boats always check the presence of the material. UV protection in the lineup.
Comparative analysis: HDPE vs PVC and Aluminium
To understand why many water-engines are switching to plastic vessels, you need to make an honest comparison with the main competitors: PVC boats require constant drying and wiping after each operation, otherwise the process of decay of the fabric and unstitching seams begins. Aluminum boats, although durable, are noisy, cold to the touch and are susceptible to electrochemical corrosion when in contact with diverse metals.
The HPD boat is devoid of most of these disadvantages, and you can just rinse it with water and put it in your garage, or even leave it outside in the snow without risk of damage. shock-absorbingIt's a dampener of the engine vibration and the impacts on the wave, which makes it more comfortable to be on board, and it's also nice to touch the surface of the HDPE, and it doesn't slide as much as wet aluminum.
Let’s look at the detailed differences in the table to systematize the data:
| Characterization | PND (Polyethylene) | PVC (Tissue) | Aluminum (Dural) |
|---|---|---|---|
| Body weight | Medium (heavier than PVC, lighter than aluminum) | Low. | Highly |
| Puncture resistance | Maximum | Low. | Medium (possible dents) |
| Term of service | 20+ years | 5-10 years | 15-20 years |
| Need to dry | Not required | Sure. | Preferably. |
| Repairability | High (sweater) | High (glue) | Difficult (argon) |
The cost of owning a PHD boat is lower in the long run than that of competitors, and the lack of need to buy a new boat every few seasons, spend money on glue, patches and special cleaning products makes this option cost-effective. Liquidity Such vessels on the secondary market also remain high due to the reputation of "unkillability".
Technology of production and assembly of PND boats
The process of creating the enclosure starts by loading the polyethylene powder into a special mold, and then the mold is placed in a furnace, where it rotates in two planes. rotationalIt allows the material to spread evenly across the walls of the mold, creating a monolithic structure without internal stresses, and it's this technology that achieves such high strengths.
When assembling the finished product (installation of cans, transom, decking), it is important to use a fastener that is compatible with polyethylene. Conventional screws can eventually shatter due to the effect of "memory" of the material when the HDPE tends to return to its original state. bolting-through with wide washers or welding the response parts directly to the body.
☑️ Checking the quality of the assembly of the PND boat
If you're planning to make a self-assembly or a self-assembly kit, pay attention to the quality of the parts docking. All transitions should be smooth, without sharp edges that could damage equipment or clothing. coatboardBecause it takes the bulk of the load from the outboard motor, in quality models, the transom is either soldered into the body during the manufacturing phase or attached through reinforced metal tabs.
Operation and care of the polyethylene case
One of the main benefits of HDPE is minimal maintenance. You don't have to dry the boat after every fishing trip, just wash the mud and silt off with a stream of water from a hose. It doesn't absorb moisture, it doesn't swell or it's not exposed to mold, which makes it an ideal choice for high-humidity regions or for those who don't have the ability to thoroughly dry the craft every time.
However, there are certain operating rules, violation of which can reduce the life of the product. For example, although the HDPE is resistant to abrasion, dragging the boat along the sharp rocky bottom at high speeds can lead to the appearance of deep furrows. slip-lace Or a keel headset made of the same material.
⚠️ Warning: When washing boats, do not use aggressive solvents (acetone, gasoline) to remove stains, as they can disturb the surface layer of the polymer. Use only warm water with a mild soap solution.
In winter, the PHD boat can be stored at any temperature; the material does not swell as much in the cold as PVC, maintaining elasticity; if ice forms on the surface, it can be gently knocked down without fear of damaging the board; the main thing is to avoid sharp metal impacts on the hull cooled to extremely low temperatures, although in normal winter conditions in Russia this is almost impossible.
To remove persistent stains from tosol or oil that can still stain light plastic, use special plastic cleaners or a weak solution of vinegar, but do not rub with abrasive sponges.
Tuning and modernization of boats from PND
Polyethylene boat owners often want to improve their boats by installing additional equipment. Fortunately, the HDPE is very adaptable. You can make additional ones yourself. fishing-box, sonar brackets, rod holders or a platform for attaching an inflatable chair, using a special soldering iron for plastic or a construction hair dryer with nozzles.
When installing transom wheels or anchor winches, it is important to remember the load distribution. Polyethylene is plastic, and point pressure can cause deformation. So all attachments must be mounted through wide support pads. Aluminum profiles They are often used to create awning frames or windshields that are attached to the boat’s bolts.
Secret of installing additional fasteners
Before welding a new element, be sure to seal the contact area and use a plastic rod of the same type (PHD) as the boat itself, otherwise the seam will be unstable.
A popular type of tuning is installation electric drive. HDPE is a dielectric, which eliminates vagus currents, but requires proper battery attachment. Many owners integrate sealed battery compartments directly into the boat's design, which cannot be done on inflatable models without losing cylinders. This also improves the weighting and stability of the vessel.
Safety and unsinkability
The water safety issue is a priority, and here the HDPE is showing remarkable results. The material is less than one density, which means that even a fully watered boat will stay afloat. buoyancyUnlike fiberglass boats, which require additional blocks of foam, a plastic vessel is unsinkable by nature.
The design of the boat often involves several insulated compartments or a double bottom, which creates an additional margin of buoyancy. Even if you get a through hole (which is extremely difficult to do in domestic conditions), the boat will not sink, but only reduce its clearance, which gives the crew time to safely get to shore or fix the malfunction.
⚠️ Attention: Unsinkability does not negate the mandatory presence of life jackets on board. When overturning a boat from an HDPE, which has a significant weight, it can be more difficult to get out of it than from a light inflatable one.
Also worth noting is the fire resistance of the material: HDPE does not support combustion on its own and melts rather than flares up like gasoline, which reduces the risk of rapid fire spreading in the event of an engine or fuel fire on board, although fire safety rules are strictly not to be neglected.
The main advantage of HDPE for safety is the absolute unsinkability of the material even if the hull is damaged, which is critical for fishing alone.
Frequently Asked Questions (FAQ)
Can I cook a crack on a boat from the HDPE on my own?
Yes, it's possible. You can use a building hair dryer or a plastic soldering iron to repair it, and you cut the edges at an angle, you degrease them, and you fill them with a PHD filler, and it's important that the melting point of the rod is the same as the melting point of the body.
How heavy is a PHD boat compared to PVC?
A PHD boat is about 20-30% heavier than an inflatable one of similar size, for example, a two-seater PHD boat weighs about 35-40 kg, whereas a PVC boat weighs about 20-25 kg. However, this weight is compensated by the rigidity of the bottom and the absence of the need to carry a heavy floor and pump with it.
Does the color of the boat fade in the sun?
The high-quality HDPE is stained in mass, meaning the dye is added to the granules before it is molded, so even if the surface layer burns out slightly after 5-7 years, the deep color will remain the same, scratches on such a boat will not be conspicuous with white stripes, as on painted metal.
What is the maximum size of the motor can be put on the HDPE?
This depends on the design of the transom and the length of the boat. Usually on boats with a length of 3 meters put engines up to 5 hp, 3.5-4 meters - up to 9.9 hp Excess power can lead to the budding of the transom in the water and loss of controllability, since the HDPE is heavier than PVC and has a different hydrodynamics.