Thermal properties

Excellent temperature and thermal shock resistance

NEXTREMA® performs even when exposed to high temperatures or rapid temperature changes. Due to its excellent resistance to temperatures of up to 950 °C and thermal shocks NEXTREMA® is the ideal solution for high temperature applications where glass properties are beneficial.
 

Coefficient of linear thermal expansion (DIN ISO 51045-1, DIN ISO 7991)

In certain applications, the coefficient of mean linear thermal expansion and therefore the total change of length of a NEXTREMA® part within a specified temperature range is important to its function. The following mean coefficient values and the graph show the temperature dependency.

CTE in different temperature ranges
 
 

 
α (-50 °C; 100 °C) -0.8 – 0.6 x 10-6 K-1  
α (0 °C; 50 °C) -0.8 – 0.6 x 10-6 K-1
α (20°C; 300 °C) -0.4 – 0.9 x 10-6 K-1
α (300°C; 700 °C) 0.1 – 1.6 x 10-6 K-1
Key properties
     Benefits
   
Thermal shock resistance of up to 820°C
  • No risk of material failure when exposed to extreme thermal shocks or uneven heating
  • Rapid heating up or cooling down from high temperatures
Near-zero CTE
  • High dimensional accuracy even under fluctuating temperature conditions
Operating temperature
of up to 950°C
  • Reliable performance in temperature ranges where other technical glasses fail
 
Thermal expansion in dependence on the temperature
SCHOTT NEXTREMA® thermal expansion thermal characteristics

Specific heat capacity
 

Cp (20 – 100 °C) 0.80 – 0.85 J / (g x K)  

Thermal conductivity
(DIN 51936, ASTM E 1461-01)           
 

λ (90 °C) 1.5 – 1.7 W / (m x K)



Homogeneous heating of the material
 
 
TTLC / Short term load (1h) [°C] 880 – 950 / [°F] 1 616 – 1 742  
TTLC / Continuous load (5000 h) [°C] 700 – 850 / [°F] 1 292 – 1 562



Inhomogeneous heating of the material
 
 
TTLC / Short term load (1h) [°C] 450 – 750 / [°F] 842 – 1 382  
TTLC / Continuous load (5000 h) [°C] 400 – 560 / [°F] 752 – 1 040


MTG 400 – 800 K
Resistance of the material to temperature differences between a defined hot zone and cold edge of room temperature, without cracking due to thermal stress.
 
Maximum temperature 
gradient (MTG)

TSR 700 – 820 °C ( 1,292 - 1,508 °F)
Resistance of the material to thermal shock when the hot material is splashed
with cold water at room temperature, without cracking due to thermal stress.

 

Thermal shock resistance 
(TSR)
The temperature / time load capacity specifies the maximum permissible temperatures for load times of the material, below which no cracking should occur due to thermal stress. The temperature / time load data for uneven and even temperature distributions (e.g. homogeneous heating conditions) within the
material are different.
   Temperature/time load capacity (TTLC)

Thermal expansion
SCHOTT NEXTREMA® transparent (724-3)
Thermal expansion
SCHOTT NEXTREMA® opaque white (724-8)
Thermal expansion
SCHOTT NEXTREMA® tinted (712-3)
Further information on request.
News, Exhibitions & Events
02.
March
Exhibition HPBExpo, Atlanta, USA, 03-02 to 03-04-2017
16.
January
Exhibition BAU 2017, Munich, Germany, 01-16 to 01-21-2017