Water makes any structure on board more demanding, and the windshield is not just a protective element, but a key factor in the comfort and safety of the crew. Constant spray, salt water, ultraviolet radiation and mechanical vibrations when moving along the wave can quickly disable poor-quality material. from which to make glass on the boatThe cockpit is the first to be decided by the boat owner before the start of the season or the upgrade of the cockpit.
The current market offers several basic materials, each with its own unique physicochemical properties, cost and installation features. The wrong choice can lead to clouding of the material, cracking or, in the worst case, breaking the structure at speed, which poses a direct threat to those on board. In this article, we will take a detailed look at the specifications of the available materials so that you can make an informed decision.
Before you start purchasing materials and revealing, you need to clearly understand the difference between conventional window glass and specialized polymers created for extreme operating conditions. acrylic, polycarbonate And tempered glass behaves differently under load, and ignoring these differences is a cost-effective way to go. Let's take each option further, weighing the pros and cons.
Organic glass (Acrylic) as a classic choice
Acrylic glass, often called plexiglass or acrylic, has been one of the most popular materials for making windshields on boats for decades, a transparent thermoplastic material that is nearly as light transmitter as conventional silicate glass, allowing up to 93% of visible light to pass through, and its main advantage is its high resistance to salt water and ultraviolet, which is critical for marine and river vessels.
But acrylic has its own processing features, which are fragile compared to polycarbonate, and can crack when hit hard by a stone or a fallen tool, and it's easy to machine, so it can be cut, drilled and, most importantly, bent by heating. Thermoforming It allows you to create complex streamlined shapes that fit perfectly into the design of a particular boat.
It's worth noting that acrylic is less scratch-resistant than some modern composites, but surface polishing makes it easy to eliminate small defects. For boats that aren't planned to be used at high speeds or in extreme storm conditions, acrylic is the middle ground in terms of price-performance. It doesn't turn yellow over time if it has the appropriate UV coating.
- 🔍 High transparency and excellent light transmission provide a good view.
- 🛡️ Resistance to salt water and most aggressive marine chemicals.
- 🔨 The possibility of self-processing and molding at home.
- 🌊 The lightness of the material reduces the overall load on the boat's design.
⚠️ Note: When drilling acrylic, be sure to use special drills with an angle of sharpening, designed for plastic, otherwise the material may crack around the hole due to internal stress.
Polycarbonate: impact resistance and reliability
If maximum strength is the priority, then the answer to the question of what to make glass from a boat is unambiguous: polycarbonate, which is 250 times stronger than glass and 30 times stronger than acrylic, making it virtually indestructible under normal operating conditions. Polycarbonate is often used to make portholes and glass of fast boats, where the risk of collision with floating objects or wave shock is highest.
Unlike acrylic, polycarbonate is highly elastic, allowing it to withstand significant deformations without breaking down. But this coin has a downside: it is prone to scratching even from dry rags. So for boat windows, only polycarbonate with specialty rods is required. anti-scratch The coating that is applied in the factory conditions.
Another important characteristic of polycarbonate is its ability to maintain strength at low temperatures, which is important for fishing in the off-season. It also provides excellent protection from ultraviolet radiation, blocking harmful radiation. The processing of polycarbonate requires caution, because when heated, it can behave unpredictably without proper experience.
When installing polycarbonate, use compensation gaps in the fastening holes, since the material has a high coefficient of thermal expansion and can "walk" when air temperature changes.
Gasoline or oil can lead to clouding or destruction of the plastic structure, so you should be very careful when servicing the engine compartment or refueling a boat.
- 💪 Extreme impact resistance, withstands heavy artillery strikes.
- 🌡️ A wide operating temperature range without loss of properties.
- ☀️ Built-in protection against ultraviolet radiation (if coated).
- 📉 Low weight, comparable to acrylic, but with better strength.
Tempered silicate glass: traditions and risks
Traditional silicate glass that has undergone the hardening procedure is still found on many boats, especially Soviet-built or budget-sized ones, and is a material with high surface hardness, extremely difficult to scratch by accident, perfectly transparent and does not turbidize over time, retaining its original appearance for decades without mechanical damage.
The main disadvantage of silicate glass is that it is fragile when subjected to impact loads on a bend or point. Unlike plastics, it does not bend, but breaks. Although tempered glass breaks down into small, non-sharp fragments when it breaks down, the mere fact that wind and water protection disappears at speed can have unpleasant consequences for crew and navigation equipment.
Also, making silicate windscreen requires industrial hardening equipment, which makes it impossible to change its shape at home. You're limited to just straight or already bent shapes, and the weight of this glass is much higher than that of plastic counterparts, which can negatively affect the stability of a small boat.
⚠️ Warning: Never attempt to drill or cut tempered glass at home - it will crumble instantly. All holes should be provided before the hardening process.
The myth of strength
Many people think that tempered glass is stronger than plastic, but it's not. It's harder (harder to scratch), but less durable to the impact. A stone that hits the glass at 40 km / h will break it, while polycarbonate will only spring.
Comparative table of material specifications
For convenience of selection and systematization of data, we will give a comparative analysis of the main parameters of the materials under consideration. This will help you quickly navigate the technical nuances and choose the best option for your tasks and budget.
| Characterization | Acryl (Plexiglas) | Polycarbonate | Tempered glass |
|---|---|---|---|
| Impact resistance | Medium | Very high. | Low (fragile) |
| Resistance to scratches | Low. | Low (uncovered) | Very high. |
| Weight (kg/m2 at 5 mm) | ~6.0 | ~6.0 | ~12.5 |
| Capability of molding | Yeah (heating) | Yeah (cold/hot) | No (factory only) |
| Price. | Medium | High. | Medium/High |
Analyzing the table, we can conclude that for high-speed vessels, where the probability of encountering an obstacle is higher, Polycarbonate is a leader in safety.For quiet pleasure boats, where appearance and budget are important, acrylic is often chosen. Silicate glass is a thing of the past, remaining the lot of classic yachts or situations where maximum surface hardness is required.
Installation and sealing technology
The choice of material is only half the battle, and the durability of a windshield depends on the quality of its installation, and there are vibrations on the boat that can shatter the rigid mount. shock-absorbing The metal or plastic must not contact the edge of the glass directly.
For sealing joints between the glass and the cockpit frame, it is best to use special marine sealants based on polyurethane or MS polymers, such as Sikaflex or 3M 5200 Normal silicone can detach over time under the influence of ultraviolet light and constant dynamics, it is important to degrease the surfaces before applying the sealant.
☑️ Checklist before installing glass
When you attach bolts or screws, don't tighten them to the point. Excessive force will create stress points in the material, which over time will lead to radial cracks, especially in acrylic and polycarbonate. Use large diameter washers to distribute the load.
- 🔧 Use only stainless steel (AISI 316) or brass fasteners.
- 💧 Make sure that water is drained so that it does not accumulate at the base of the glass.
- 🌬️ Consider wind load when calculating the thickness of the material for your boat.
- 🧼 Wash glass regularly with fresh water to remove salt deposits.
⚠️ Note: Do not use acetone, gasoline or aggressive solvents to clean the windscreen, especially if it is polycarbonate or acrylic - this will lead to irreversible clouding of the surface.
Care and maintenance during operation
Even the best quality material requires proper care. Salt water, drying, leaves salt crystals that work as an abrasive. Therefore, after each foray into the sea or salt lake, it is recommended to rinse the glass with fresh water. For washing, use a soft sponge and special products for caring for boat optics or car windows without ammonia.
If you get scratches on the surface, you can polish the acrylic glass with special pastes, restore transparency. You can't polish the coated polycarbonate, you'll erase the protective layer, and in this case, you'd better replace the panel, because the clouded glass worsens visibility and safety.
Check the condition of the fasteners regularly, the vibration has the property to unwind even well-tightened nuts. Loctite) will help to avoid loss of fasteners in water, also monitor the condition of seals: if the rubber is choked or cracked, it must be replaced to avoid leakage into the cockpit.
Proper care of the windscreen extends its life by 2-3 times and maintains excellent visibility in all weather, which is critical for navigation safety.
In conclusion, it is worth noting that you should save on windscreen, it is an element that protects you from the oncoming flow of air, water and insects. Quality material and competent installation will ensure the comfortable operation of the boat for many seasons, allowing you to enjoy the water element without unnecessary discomfort.
FAQ: Frequently asked questions
Can I use a normal window glass for a boat?
It's not recommended, it's not hardened, and when it hits or vibrates, it breaks into big, sharp shards, which is dangerous for people, and it's heavier and doesn't have the flexibility.
What thickness of material to choose for a boat with a length of 4-5 meters?
For boats of this size, the optimal thickness would be 4-5 mm for acrylic and polycarbonate. If you plan to walk at high speeds or in the wave, it is better to take 6 mm to increase the rigidity of the structure.
What is the best way to wash the windshield on a boat?
Use warm water with soft soap or special sprays to clean plastics. Avoid products with abrasive particles, ammonia or alcohol, as they can damage the surface and protective coating.
Why is the glass on the boat turning yellow?
Yellowing usually occurs due to the destruction of the material structure under the influence of ultraviolet light (if there is no UV protection) or due to a chemical reaction with aggressive environments. Cheap plastics turn yellow faster than quality analogues.