uPVC Sliding Doors HST 85 mm

Brand: Aluplast
What you get
  • A perfectly-fitted system for large constructions
  • A low level threshold of 50 mm as standard
  • Modern technological solutions
View specification
Lead time: up to 8 weeks Find out more

Guarantee included at purchase Find out more


Depth of the frame [mm]197.5
Maximum thickness of the glazing unit [mm]51
Profile thicknessClass A
Wind resistanceB3
Water resistance7A
Acoustic insulation33 - 45 dB
Air permeabilityClass 4
Specifications - Read more

Profile thickness

The walls of the window chambers have different thickness, which determines the class of the profile. The thickness of the profiles is defined by the PN-EN 12608: 2004 standard. Profiles can have three classes: A, B and C. This parameter specifies the wall thickness of the profiles. The Class A profiles have outer walls with a thickness of ≥ 2.8 mm. Class B ≥ 2.5 mm. The standard does not define any requirements for class C sections. Class A profiles are the best choice as they provide us with the best window insulation. However, while selecting the so- called “warm” windows, you should also pay attention to such elements as the number of chambers, gaskets, type of the fittings, warm edge spacer, and glazing unit.

Wind resistance

It is one of the most important properties of windows and doors. It determines the safety of the entire structure, as it indicates the amount of pressure caused by wind that the window or door structure is able to resist without serious damage. The classification of wind-resistant windows and doors is carried out in accordance with PN-EN 14351-1. The wind load resistance of the window is described by two symbols: the number (1-5) which indicates the pressure of wind applied to the product and the letter (A-C) which indicates the amount of accepted deflection.

Thickness of the glazing unit

A glazing unit is a structure consisting of two, three, or even four panes of glazing separated from each other by a distance frame, sealants and vapour-absorbing gas (argon \ krypton). The thickness of the glazing unit is the overall measurement, from the outside glass surface to the inside glass surface. The average double glazing thickness is about 24 mm while triple-glazed windows are 42 – 48 mm in thickness on average. The number of panes in a glazing unit affects the improvement of the U-value parameter

Water resistance

It is the capacity to avoid water leakages under wind and rain at the same time. Leakage is defined as the appearance of uncontrolled water (other than condensation) on the inner surface of the product. Obviously, the doors and windows with good waterproof performance can effectively prevent water from entering into their internal structure and – as a result – ensure a longer service life. The classification ranges from Class 0 (no test) to Class 7A for windows and Class 3A for doors.

Air permeability

It is the measurement showing how easily air can pass through a window or a door. The European Standard regarding air permeability in windows and doors is EN 12207. It classifies windows or doors according to their capability to prevent air travel through the system. This capability is measured on a scale, from Class 1 (less tightness) to Class 4 (higher tightness). A window or a door system with a higher level of air tightness is more energy-efficient, as less heated air escapes through it.

Acoustic insulation (Rw)

Acoustic insulation coefficient. It determines the insulation of the sliding doors against noise from the outside. The unit of measurement is decibels (dB). This parameter is influenced by: the thickness of the glazing in the glazing unit, the use of PVB laminated glass or the use of an acoustic foil.

Depth of the frame

A very important dimension, saying a lot about sliding doors quality and functionality. The depth affects the sound insulation, thermal insulation (U-value) and stiffness of the structure. To put it simply: the bigger the depth, the warmer the sliding doors.

HST 85 mm

The ideal solution for those who want a comfortable connection between the interior and the terrace and a panoramic view achieved with a large glazed area. Thanks to the modular character of the structure, there is a possibility of three arbitrary product configurations, depending on the expected thermal parameters: Basic, Standard and Premium.

HST 85 mm system is available with a low level threshold (50 mm) as standard. It is enough to lift and move the movable sash of the HST window so that both floor levels – external and internal – form one plane. Thanks to this, the space becomes open and elegant. A low level threshold guarantees effective thermal insulation, trouble-free movement for people with disabilities and small children and trouble-free maintenance thanks to removable profiles. It also allows for trouble-free modernisation of lift and slide doors.

On request, there is an additional option available: a 50 mm level threshold with a linear drainage. It is an additional gutter placed on the outer side of the sliding system, that helps to effectively drain even large amounts of rainwater and get rid of accumulated impurities, such as: leaves, sticks or small twigs.

HST 85 mm – benefits

  • Window frame installation depth and threshold: 197.5 mm
  • Maximum sash dimensions: 3000 mm x 2700 mm
  • Depth of the frame: 140 mm
  • Fittings – lift & slide system up to 180 kg
  • Special window fittings ensuring that the sashes move freely and without any resistance against each other or against unopened parts of the structure
  • A special arrangement of overlapping strikers equipped with a system of butt joint gaskets for the adequate tightness of the space between the moving sashes of HST doors
  • A low level threshold of 50 mm as standard
  • Three different threshold solutions: Basic (Alu / PVC), Standard (Alu / PVC with thermal break) and Premium (Plastic GFK, filled with foam)
  • More freedom in disposing of the living space – the doors do not enter deep into the room after opening
  • The possibility of using energy-saving glazing units with a width of up to 51 mm allows to achieve very high thermal insulation of the structure
  • HST 85 mm FIXFRAME – a new solution with a very narrow frame in the solid part (FIX) for the greater amount of light coming in

Price list

“The prices shown in the Price List are for white, double-glazed and/or triple-glazed products and do not include changes in colours, accessories, dimensions, etc. Each change affects the final price of the product. The presented price offer is for information purposes only. If you want to know the detailed quote on your individual order, please contact our Sales Team. We will get back to you with the final price that is tailored to your specific needs – free of charge!


AP 01
AP 02
AP 05
AP 06
AP 11
AP 15
AP 19
AP 20
AP 21
AP 22
AP 23
AP 25
AP 27
AP 28
AP 29
AP 30
AP 32
AP 34
AP 40
AP 41
AP 43
AP 44
AP 47
AP 50
AP 52
AP 60
AP 61
AP 62
AP 63
AP 65
AP 70
AP 71
AP 72
AP 75
AP 79
AP 88
AP 94
AP 95
AP 102
AP 103
AP 104
AP 105
AP 106
AP 107
AP 108
AP 109
AP 110
AP 111
AP 112
AP 113
AP 115
AP 116
Show all (52)

Files to download

Recently viewed products

Our realizations

How it works

Asking for a quote
Number One

Asking for a quote

Press ‘Get a quote’ button and submit your enquiry with the chosen joinery parameters.

Receiving the quote
Number Two

Receiving the quote

Our sales team will return to you with the purchase quote on joinery, delivery/installation costs and the lead time.

Number Three


Our employee will go through all the information included in the offer together with you.

Agreement and Payment
Number Four

Agreement & Payment

It is the stage where we confirm the contract and you make the payment.

Number Five


It’s the time it takes to produce your ordered joinery.

Number Six


This is the shipment period for your ordered products.

Number Seven


If you’re interested in our installation services, we agree on the dates individually.

Remove all
Compare products