FAQ - Frequently Asked Questions


What is uPVC?

PVC stands for Poly Vinyl Chloride. It is a thermoplastic polymer that consists of ethenyls and chloride. PVC is the third most widely produced plastic, after polyethylene and polypropylene. The "u" in U-PVC means unplasticized or rigid. uPVC or Rigid PVC is widely used in the building industry as a low-maintenance material for window frames.

What is the difference between PVC windows, PVC-U windows, uPVC windows and vinyl windows?

PVC windows, PVCu windows, uPVC windows and vinyl windows are the same thing. People from North America tend to call them vinyl windows, while people from Europe and Asia tend to call them PVC, uPVC, or PVC-U windows. 

What advantages do uPVC windows have over aluminum, wood, or steel windows?

Please refer to our Why Use UPVC page for more information.

How does KUNSTOF compare in price with aluminum and other PVC fabricators?

KUNSTOF windows are priced slightly higher than standard aluminum, but they are very competitively priced compared to other uPVC windows in the market. However, Filipino customers put a higher premium on their money's value than on the cheapest price available. When it comes to value for money, KUNSTOF windows are unbeatable. Premium Quality. Great Value. That's what KUNSTOF stand for.

What is the major difference between KUNSTOF and other uPVC fabricators?

KUNSTOF is the only company in Cebu that has a fabrication plant, complete with state-of-the-art machinery, which include 3-head seamless welding machine, PVC bending machine, and machine for insulated glass units among others. This makes it faster and cost-efficient for customers in Visayas and Mindanao. It is also allied with the largest glass processing plant in Cebu. So no matter what type of glass - colored, textured, or tempered - we have it. KUNSTOF is first to offer heavy-duty screen doors with uncut profiles and is also the first to promote insulated glass units and low- emissivity glass for thermal/energy efficiency and noise insulation.

What can be done if the profile is scratched, smoke damaged or burnt?

For white profiles, the color goes right through the profile, so scratches and marks can be sanded out completely and polished smooth to bring it back to as good as new.

How does PVCu stand up to fire?

uPVC does not support combustion but will char. uPVC will not burn on its own as it is resistant to ignition and is self-extinguishing.

What colors are available? 

Please refer to our Products page for more info.

What Guarantees do you provide?

KUNSTOF guarantees all of our products (subject to correct installation and normal condition of use and maintenance), for the period as follows:

uPVC Profiles (from discoloration, cracking, and warping) - 10 years
Double glazed units - 10 years 
Hardware - 3 years

How do I clean my windows?

Cleaning Tips:

  1. Dirty frames can be cleaned with warm water mixed with washing liquid.
  2. Abrasive cleaners, as well as dry cleaning with a duster, should be avoided. Cleaning solutions and polishes that contain solvents or thinners should not be used. Aggressive chemicals like these will attack the window frame and seals.
  3. Rust patches can only appear as a result of external metal particles from the outside atmosphere.

Maintenance Tips:

  1. All moving parts of fittings should be lightly oiled once or twice a year, to ensure that the windows will always open smoothly.
  2. Most fittings have a built-in adjustment facility, so if a window should begin to stick, contact us, as only a trained window installer has the skill to make the necessary adjustments.

**For windows with LOW-E glass coating:

Low-E Glass has a very thin pyrolitic coating integral its surface. The hard and durable low emissivity top coating gives it improved thermal insulation performance compared to ordinary clear glass. The low emissivity coating has a very fine and hard texture which requires a slightly different cleaning procedure compared to plain, non-coated glass.

Recommended glass cleaning solutions:

  1. Mixture of one part vinegar with one to ten parts clean water.
  2. Glass cleaners that have no ammonia or alcohol content because these products tend to leave visible streaks.

Cleaning Procedure:

  1. Flood the low emissivity coated surface with the spray-on cleaning solution or with a cloth saturated with the cleaning solution. Be generous with the amount of solution applied.
  2. Rub the wetted surface with a clean, lint free towel or cloth.
  3. Wipe dry with a dry, clean, lint free towel or cloth. Do not use a squeegee on the low emissivity surface.
  4. To prevent streaking, stop wiping when the glass is almost dry and there is still a uniform thin film of moisture left on the glass surface. This film will quickly evaporate leaving a clean surface.