Weather resistant
Does not easily expand, fade or rot from heat and rain.
Everything you need to know before choosing doors and windows for your home.
Why UPVC
Why choose UPVC?
UPVC is ideal for Indonesia's tropical climate — functional, elegant and built to last for years.
Low maintenance
No repainting, no rust, easy to clean.
Sound & heat insulation
Keeps rooms calm and energy-efficient.
Eco-friendly
Lead-free and recyclable.
Safe & strong
Reinforced with high-quality material to last.
Profile cut-away
Getting to know UPVC material
This is the inside of a UPVC window corner. These five things make it strong, sealed and long-lasting.
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Selected formulation
Produced with a selected formulation so the profile stays rigid.
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Flexible glass bead
A flexible glazing-bead design that works with any glass size.
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EPDM gasket
Makes the room more soundproof and water-tight.
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Galvanised steel core
Internal chambers hold galvanised steel — adding maximum strength, security and durability.
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Fusion-welded corners
Joints are stronger and withstand pressure.
Illustrative cut-away photo. The shape and number of chambers vary with the profile series chosen.
Comparison
How it compares with other materials
| Wood | Aluminium | UPVC | |
|---|---|---|---|
| Cost | Expensive finishing | Fits a budget | No finishing needed & budget can be tailored |
| Maintenance | Intensive upkeep | Joints need intensive care | No upkeep needed — corners are welded |
| Sound insulation | Not soundproof | Moderately soundproof | Soundproof thanks to rubber seals on frame and sash (same principle as a car door) |
| Weather & heat resistance | Swells, leaks, rots, not heat resistant | Expands, leaks, not heat resistant | Withstands all weather and tropical sun heat |
| Corrosion & termites | Prone to rot & termites | Can corrode | Corrosion-free, resistant to water & humidity |
FAQ
Frequently asked questions
UPVC (unplasticised polyvinyl chloride) is a rigid, strong profile material. In Gerha profiles the internal chambers are reinforced with galvanised steel and corners are fusion-welded for strength and pressure resistance.
No. UPVC needs no repainting, does not rust and is easy to clean. Corners are welded, so joints need no upkeep.
Yes. Every product is tailored to your needs and site. Our team visits to survey and measure, then sends shop drawings for your approval before production.
In stages following progress: a down payment of at least 50% to start production, a second instalment once production is finished (a condition of delivery), and the balance after installation and your confirmation.
Black Glitter, Grey Glitter, Japanese Wood, Dark Oak, Golden Oak, Solid White, Black Color and Glossy Brown — from minimal looks to natural wood grain.
We take custom orders in Semarang and Ungaran. For other locations, please contact us to discuss.
Articles
UPVC insights for your home
Tips on choosing, caring for and understanding UPVC doors and windows.
Why UPVC suits Indonesia’s tropical climate
Heat, humidity and heavy rain take turns. Here is why UPVC holds up better than wood and aluminium for your doors and…
Read more
UPVC, aluminium or wood: which is right for your home?
An honest comparison of three materials on five points: cost, upkeep, sound insulation, weather resistance, and corrosion & termites.
Read more
Swing, tilt or sliding: choosing a window type
Each window type has its own strengths. Learn how they open so you can match them to the room and the size…
Read moreReady to upgrade your home with UPVC?
The Gerha team is ready to help from consultation to installation — fast response, clear schedule. Contact us for:
- Needs consultation
- Survey scheduling
- Best-solution discussion
Architect or contractor?Discuss specifications, shop drawings and your project schedule directly with our team.
Discuss a project 