Composite Doors
Your Professional Composite Doors Supplier
We are committed to creating better living and commercial spaces through innovative aluminum window and door systems.
With over 19 years of experience, SGL integrates R&D, design, manufacturing, and installation, providing high-end, customized solutions to partners worldwide.
Why choose us
Quality Assurance
Our production process incorporates rigorous quality control. From raw material inspection to in-process testing and finished product inspection, all products undergo three stages—initial inspection, sampling inspection, and final inspection—to ensure the highest quality.
Markets
Our products have gained international recognition and are exported to major global markets, including the United States, Canada, Germany, Russia, Saudi Arabia, Singapore, and Vietnam, fully complying with local standards.
Customization Solutions
As a direct manufacturer, we offer highly competitive prices and flexible customization options to meet diverse project needs.
product Parameter (specification)
|
Item |
Specification / Description |
|
Product Name |
Black Composite Door (Black Composite Doors) |
|
Standard Door Thickness |
35 mm / 44 mm / 54 mm (customizable) |
|
Standard Door Opening Sizes (Single Door) |
Width: 700 / 800 / 900 / 1000 mm; Height: 2000 / 2050 / 2100 / 2200 mm (non-standard sizes available) |
|
Customization Range |
Any width/height within structural limits; recommended max single-leaf width 1200 mm, max single-leaf height 2400 mm (special structures negotiable) |
|
Outer Panel Material |
GRP (glass-fiber reinforced polyester) / polyester-coated panels / aluminum composite panels (weather-resistant coating) |
|
Core (Internal Structure) |
Polyurethane foam core / high-density honeycomb core / timber frame + reinforced fill (optional) |
|
Reinforcements |
Hot-dip galvanized steel or stainless steel reinforcement strips (edge and lock zone) |
|
Door Frame Material |
Solid composite frame / aluminum-clad composite frame / steel frame (project-dependent) |
|
Surface Finishes |
Matte fine-texture / semi-matte / high gloss / woodgrain spray / custom colors (RAL color options supported) |
|
Color Options |
Standard black or custom color matching |
Composite door benefits
Lasts a long time
Installing a composite front door is a solid investment that won't have to be replaced for at least 35 years. Unlike timber, it won't crack or peel paint and unlike cheap uPVC, won't warp, fade or look shabby after time.
Hard-wearing
Composite doors are stronger than the sum of their parts and the materials used in combination mean that the door is more durable than timber or uPVC. They will stand serious wear and tear, bumps and knocks and the external GRP material is especially resistant to denting, kicks and knocks.
Sturdy and secure
One of the most important features of a door is just how strong and secure it is and composite doors have superior security due to the steel-reinforced frame and the internal solidity of the door. The quality of composite doors does vary, so look out for security standards that would mean a burglar is going to find it almost impossible to break through that one.
Thermally efficient
Old doors have problems from draughts and gaps caused by warping and shifting in the frame. Although wood has good thermal properties, it can't compare to the insulating core of a composite door and the precision fit manufacture means the door sits perfectly in the frame to eliminate gusty gaps. Composite doors are A-rated for thermal efficiency and will help to retain heat in the home.
Kerb appeal
There's no doubt that a beautifully painted timber door looks stunning and can add value to a property. With a specially moulded wood-grain effect surface, the composite door looks just as good as wood but has the benefit of always looking like a freshly painted wood door.
Low maintenance
As beautiful as timber looks, wood is a high-maintenance material. The freshly painted look doesn't last long – wood needs care and attention to stop the door from cracking, rotting or peeling. And wood weathers fast. Composite doors look just as good as wood but have the benefit of only needing a quick wash with a cloth to keep them looking their best – you should expect good looks and long life out of your composite door.
The external part of a composite door is made from a 2mm layer of Glass Reinforced Plastic (GRP), also known as fibreglass, the same stuff they use to make fishing boats in the North Sea. It's tough, weatherproof and moulds perfectly to replicate a wood grain for a door with kerb appeal.
The tough exterior GRP panels are fused to an internal frame made from uPVC and layered inside that is another frame of hardwood which makes a double frame of superior stability and rigidity.
The internal space of the door is injected with a warm thermal polyurethane foam core that's 100% CFC and offers excellent heat retaining A-rated insulation to make your door more energy efficient.
The outer door frame, constructed from sturdy 70mm uPVC and steel reinforcement, makes composite doors one of the most secure you can buy.
How composite doors are made
A composite door is built in a quality-controlled factory by following this process
The frame of the door is built first. It will typically be made of reinforced structural members which have been cut to exact specifications.
The hardwood or UPVC inner frame is then laid down to fit the outer frame. At this point, other reinforcing materials can be added for extra strength.
The locks, hinges, and latches are added and secured to the solid frame.
The front and rear faces are added at this point and are typically made of durable UPVC or GRP.
Expanding polyurethane foam is injected between the faces at high pressure, to ensure that it fully penetrates the door structure. Alternatively, the core can be made from solid timber.
The door is finished by hand, which includes cutting and fitting the windows, and installing the letterbox and any door furniture.
Our Certificate
