• Facebook
  • Twitter
  • Pinterest
  • LinkedIn
  • Youtube
  • Instagram
  • Run
  • Fundacja
  • Set of certificates
  • Quick links
    • Declarations of performance CE
    • Set of certificates
    • Download the brochure
    • General terms and conditions of sale (GTCS)
    • Company standard
  • Contact
  • International English
    • Deutsch
    • Français
    • Italiano
    • Polski
    • Русский
    • Svenska
  • International English International English International English en
  • Deutsch Deutsch German de
  • Français Français French fr
  • Italiano Italiano Italian it
  • Polski Polski Polish pl
  • Русский Русский Russian ru
  • Svenska Svenska Swedish sv
PRESS GLASS SA
  • Market offer
    • Glazed units
      • Low emission glass
      • Glazed units with warm edge
      • Solar control glass
      • Safety and Security glass
      • Bullet-proof glass
      • Acoustic glazed units
      • Fire-resistant glass
      • Ornamental glass
      • Window dividers
    • Special glass
      • Toughened glass
      • 3D Glass
      • Bent toughened glass
      • Heat Soak Test – HST
      • Machining of edges
      • Drillings
      • Cuttings
      • DIGITAL PRINT
      • Silk-screen printing
      • Spandrels
      • Laminated glass
    • Single glass
  • Tools
    • PRESS GLASS
    • Suppliers
  • Reference projects
  • About us
    • Code of Conduct
    • Continuous development
    • Modern logistics
    • Photo gallery
    • Environment Protection
    • Production potential
    • Best quality
    • Sport and support
    • Quality management
    • Technological advantage
    • Wide assortment
    • For shareholders
    • News
    • Individual support
    • Cooperative potential
  • Careers
  • Contact
  • #30PressGlass
  • Search
  • Menu

Heat Soak Test – HST

Why does tempered glass pane fracture spontaneously when heated?

Tempered glass manufactured by PRESS GLASS ranks among the very top quality products. It complies with PN-EN 12150-1 standard regarding strength, fracture pattern, dimensions and tolerances as well as edge finish. Test results prove our product exceeds strength parameters stipulated in the standard. Nevertheless, this state-of-the-art product shows a certain weakness characteristic of float glass: tiny nickel sulfide crystals (NiS) which may occur in molten glass during float glass production process. When glass is heated during toughening, nickel sulfide impurities in the glass pane increase their volume; when the heated glass is rapidly quenched

in the toughening process, the impurities, which need a certain amount of time to return to their original state, cannot do so and become “frozen”, producing additional local stress concentration. The mechanism resembles a delay-action bomb: when toughened glass containing nickel sulfide impurities is used in a structural glazing system on a building façade, it gets heated by sun rays, allowing frozen crystals to expand, and thus generating even more internal stress. With an inclusion in the core tensile zone, stress is highly likely to exceed the acceptable level, causing spontaneous fracture of the pane.

How does the Heat Soak Test (HST) work with toughened glass?

Understanding the mechanism of spontaneous nickel sulfide failures helped develop a method to eliminate panes likely to suffer breakage: Heat Soak Test, or HST.

Toughened glass is heated up to approximately 290oC for a period of time specified in the applicable standard. Close to 99% glass panes with inclusions will be identified and suffer fracture.

Why should you ask for HST toughened glass?

There is a growing tendency to require glass used for large projects be HST tested. Regulations become more stringent and investors better aware of potential consequences caused by spontaneous fractures of already installed glazing systems. Fractured glass panes must be promptly replaced, a very costly procedure often calling for a lifting crane or other specialized equipment.

A broken pane may leave facilities with restricted access wide open. Fracture of a tempered façade pane occurring at a high elevation may cause injuries when glass shards, despite their small size and blunt edges, hit people who happen to be close to the building, and that may mean legal problems for the building manager.

Market offer

PRESS GLASS has applied HST to the full range of our toughened glass products. We use an HST oven calibrated by IFT Institute of Rosenheim to perform HST testing. Test results confirm the heating process conforms to PN-EN 14179-1 standard “Heat-Soaked Thermally Toughened Soda Line Silicate Safety Glass”.

The heating process for an HST test does not impair the safety class or strength of toughened glass. Customers who order HST testing get high quality toughened glass checked for spontaneous fracturing caused by nickel sulfide inclusions.

Toughened glass produces by other companies – only HST by PRESS GLASS

Glass
thickness
[mm]
Minimum panel
dimensions
[mm]
Maximum
panel dimensions
[mm]
HST 4-19

Minimum dimension

of longer side 400 mm

3200×7000

MOVIE

Verification of hardened glass by Heat Soak Test

We constantly modify our manufacturing processes and change habits to limit the negative effect on the environment.

In order to facilitate the changes, we have adopted ISO 14001, the worldwide management system for environmental protection.

Read more

© Copyright - PRESS GLASS Holding SA 2021
  • Facebook
  • Twitter
  • Pinterest
  • LinkedIn
  • Youtube
  • Instagram
  • Run
  • Fundacja
  • Contact
  • Privacy Policy
  • Economic Freedom Foundation
Scroll to top
In addition to strictly necessary cookies, we also use cookies to improve the user experience.
I accept all cookies I accept only the necessary cookies Cookie Settings Privacy policy
Cookie settings

Cookie settings

Cookies are small text files placed on the user’s computer or mobile device, which enable interface customisation of your web browser and provide better functioning of our website.

To ensure proper functioning of our website via strictly necessary cookies, the data stored in our systems is anonymised and it does not involve processing of any personal data.

Our website may also install other cookies, but only with your consent. You can revoke your consent any time without any consequences for browsing our website.

Our website uses the following cookies
Strictly necessary cookies
Always Enabled
Strictly necessary or required cookies are restricted to what is essential to provide the service requested by the user or basic functioning of the website and as such do not require your consent.
CookieDuration
cf7emc_user_token1 day
cookielawinfo-checkbox-marketing1 hour
cookielawinfo-checkbox-necessary1 hour
cookielawinfo-checkbox-non-necessary1 hour
CookieLawInfoConsent1 hour
mte-notification-bar-landingpageSession
viewed_cookie_policy1 hour
Performance cookies
Performance cookies enable measuring traffic and analysing the behaviour of website visitors to improve functioning of the website.
CookieDuration
_ga2 years
_gat_UA-21037135-330 minutes
_gid1 day
Marketing cookies
Marketing cookies are used to deliver relevant advertising and marketing campaigns to visitors. These cookies track visitors across websites and collect information to deliver tailored advertising.
CookieDuration
_fbp3 months
sb2 years
SAVE & ACCEPT
Informujemy, że ramki SWISSPACER zostały czasowo wycofane z planu produkcyjnego.
Parametry dotyczące ramek SWISSPACER prezentowane na tej stronie służą jedynie do celów porównawczych.
Es wird Ihnen mitgeteilt, dass die SWISSPACER Rahmen vorübergehend aus dem Produktionsplan zurückgezogen wurden.
Die auf dieser Seite angegebenen Parameter der SWISSPACER Rahmen dienen lediglich Vergleichszwecken.
Please be advised that SWISSPACER bars have been temporarily withdrawn from the production plan.
The SWISSPACER frame parameters on this page are for comparison purposes only.
Nous vous informons que les cadres SWISSPACER ont été temporairement retirés du plan de production.
Les paramètres relatifs aux cadres SWISSPACER sont présentés sur le site uniquement à des fins de comparaison.
Obavještavamo da su distanceri SWISSPACER privremeno povučeni iz proizvodnog programa.
Prikazani na ovoj stranici parametri koji se odnose na distancere SWISSPACER služe samo u komparativne svrhe.
Vi informiamo che i distanziatori SWISSPACER sono stati temporaneamente ritirati dal piano di produzione.
I parametri dei distanziatori SWISSPACER presentati in questa pagina servono solitamente a scopo di confronto.
Информируем, что рамки SWISSPACER временно сняты с производства.
Параметры рамок SWISSPACER, представленные на этом сайте, предназначены только для сравнения.
Vänligen observera att ramarna SWISSPACER tillfälligt drogs tillbaka från produktionsplanen.
Parametrarna för SWISSPACER-ramar på denna sida är endast avsedda för jämförelse.
Ze względu na ciągły rozwój nasz asortyment może różnić się w zależności od rynku.
Dostępność produktu należy zawsze potwierdzić z Działem Sprzedaży.
In Berücksichtigung auf ständige Entwicklung unserer Produkte, kann sich das Angebot auf verschiedenen Märkten unterscheiden.
Die Zugänglichkeit vom Produkt sollte immer mit der Verkaufsabteilung bestätigt werden.
Due to the continuous development of our product range may differ from market to market.
Product’s availability should always be confirmed with Sales Department.
En raison du développement continu de notre gamme de produits, notre gamme de produits peut différer d’un marché à l’autre.
La disponibilité du produit doit toujours être confirmée auprès du service commercial.
Zbog kontinuiranog razvoja naš asortiman proizvoda može se razlikovati od tržišta do tržišta.
Dostupnost proizvoda uvijek treba biti potvrđena s odjelom prodaje.
Considerando il continuo sviluppo della nostra gamma di prodotti, l’offerta puo’ variare in diverse regioni.
Si prega di verificare sempre la disponibilità del prodotto con il nostro Ufficio Commerciale
В связи с постоянным развитием ассортимент нашей продукции может отличаться от рынка к рынку.
Наличие товара всегда необходимо подтверждать в отделе продаж.
På grund av den kontinuerliga utvecklingen av vårt produktsortiment kan det skilja sig från marknad till marknad.
Produktens tillgänglighet ska alltid bekräftas med försäljningsavdelningen.
Facebook
Facebook
  • International English
  • Deutsch
  • Français
  • Italiano
  • Polski
  • Русский
  • Svenska
Realization Tab2
Facebook