MD82 Series: Why 7-Chamber uPVC is Redefining the Energy Standard for 2026

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MD82 Series: Why 7-Chamber uPVC is Redefining the Energy Standard for 2026

Engineer’s Note: In a world of rising energy costs and stricter fire regulations, a “standard” window profile is no longer enough. We engineered the MD82 to solve the two biggest pain points in modern construction: heat loss and structural fire integrity.

Beyond Insulation: The Science of the 7-Chamber Barrier

Most uPVC profiles stop at 5 chambers. The MD82’s unique 7-chamber architecture creates multiple stagnant air pockets that act as a thermal shield.

  • Energy Gain: Achieves a whole-window K-value of < 1.10 W/m²·K, reducing HVAC load by up to 25% in extreme climates.
  • Acoustic Comfort: With a sound insulation rating of Rw ≥ 35dB, it effectively filters out high-frequency urban noise, turning a busy street-side apartment into a quiet sanctuary.

Fire Integrity: The 304 Stainless Steel Breakthrough

Standard uPVC often fails under extreme heat. The MD82 integrates 304 stainless steel fire-resistant strips and three expansion-strip chambers.

  • 1400°C Threshold: The internal stainless steel reinforcement can withstand temperatures up to 1400°C.
  • 60-Minute Integrity: Guaranteed fire resistance for over 1 hour, meeting the latest national safety standards for residential and commercial towers.

Procurement FAQ: Specifying the MD82 for Your Project

Q: Can the MD82 be used in high-rise buildings with extreme wind pressure? A: Yes. According to our internal stress tests (GB/T7106), the MD82 combined with steel reinforcement handles wind pressures up to 4500 Pa. The 3-seal system ensures Grade 6 air-tightness, preventing “whistling” noises at high altitudes.

Q: Is the woodgrain film UV-stable for tropical regions? A: We utilize Swiss CIBA UV-convert agents and American DuPont titanium dioxide in our formulation. This ensures the profile maintains color integrity for 30+ years, even in regions with high UV indexes like Southeast Asia or the Middle East.

 

 

[MD82 Structure ]
[MD82 Three Breaking Throughs in Fireproof：]
  1. Add 304 stainless steel fire strip to the opening part and the outside of the glass.
  2. Add three “interpenetration expansion strip” card slots at the opening part of the fan.
  3. The application of these two technologies, together with the corresponding fire materials and measures, which guaranteed the national standard of fire resistance of “MD82 fire window” greater than 1 hour.

Structure of 304 Stainless Steel Fire Strips

1.Stainless steel fireproof strips are added onto of the frame，sash and all the outer edge of glasses.     

2.Expansion strips and fire insulation strips inside of the fire proof strips.

3.The stainless steel fire insulation strips can bear 1400 °C， which greatly strengths the fire proof property of the whole.
fire proof upvc window

 

[Insert card slot]
  1. Three expansion strips’ rabbets are added onto the opening sash.
  2. It has changed the shortcomings of traditional expansion strip easy to roll edge and fall off.
  3. It will be easy to maintain. And will prevent leakage on installation and guarantee the quality and performance.
  4. No need to insert expansion strips during manufacturing casement window. Realized a multi – purpose.
[Four card slot design]
  1. Four “insert type expansion strip” card slots.
  2. 10mm*3 and 15mm*1 fire expansion strip can be inserted.
  3. In case of fire, expansion can fill the two Chambers of the opening part. Which will completely isolate smoke and harmful gases from entering the room.

inowa High Air-Tight Door
[Sectional drawing of inowa]

 

 

[Node drawing of inowa door]

 

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