DURAN® GLASS STIRRING ROD
ø 6 x 200 mm - 4 pcs.


Very high chemical resistance

 DURAN® borosilicate glass is highly resistant to water, neutral and acid solutions, concentrated acids and acid mixtures, and to chlorine, bromine, iodine and organic substances. Its chemical resistance is superior to that of most metals and other materials, even during prolonged periods of exposure and at temperatures above 100 °C.
Only hydrofluoric acid, concentrated phosphoric acid and strong alkali cause appreciable surface removal of the glass (glass corrosion) at elevated temperatures (>100 °C).


DURAN® has the following approximate composition (%):

SiO2 B2O3 Na2O + K2O AI2O3
81 13 4 2

Chemical resistance

Hydrolytic resistance class (DIN ISO 719)                
class 1
Acid class (DIN 12 116) class 1
Alkali class (DIN ISO 695) class 2

Due to its good hydrolytic resistance, DURAN® meets the requirements of the USP, EP and JP and is a neutral glass that corresponds to glass type 1. It can therefore be used in an almost unrestricted way in pharmaceutical applications and in contact with foodstuffs.

Inert behavior

 Due to the inert behavior of DURAN® there is no contact or interaction (e. g. ion exchange) between medium and glass, which avoids interfering effects.

 

High usage temperature

 The maximum permissible operating temperature for DURAN® is 500 °C. Above a temperature of 525 °C the glass begins to soften and above a temperature of 860 °C it changes to the liquid state.


DURAN® can be cooled down to the maximum possible negative temperature and is therefore suitable for use with liquid nitrogen (approx. – 196 °C). During such use/ freezing. In general DURAN® products are recommended for use down to – 70 °C. During thawing ensure that the temperature difference does not exceed 100 K.

Minimal thermal expansion & high resistance to thermal shock

 DURAN® glassware is characterised by high resistance to changes in temperature (ΔT=100 K). With its very low coefficient of linear expansion (3.3 x 10–6 K–1), literally no tension is built up in the article, when the temperature changes rapidly. Therefore, it does not crack or shatter, when boiling water is filled in. 

 

Physical data

Coefficient of mean linear thermal expansion α (20 °C; 300 °C)
acc. to DIN ISO 7991		 3.3 x 10-6 K-1
Transformation temperature T g 525 °C
Temperature of the Glass at viscosity η in dPa x s:
1013 (annealing point)
560 °C
107.6 (softening point) 825 °C
104 (working point) 1260 °C
Maximum short-time working temperature 500 °C
Density ρ at 25 °C 2,23 g x cm-3
Modulus of elasticity E (Young´s modulus) 64 x 103N x mm-2
Poisson´s ratio µ 0,20
Thermal conductivity λw at 90 °C 1,2 W x m-1 x K-1
Temperature for the specific electrical resistance of 108 Ω x cm
(DIN 52 326) t k 100		 250 °C
Logarithm of the electrical volume resistance (Ω x cm) at 250 °C 8/at 350 °C 6,5
Dielectrical properties (I MHz, 25 °C) Dieletric constant ε 4,6
Dielectric loss factor tan δ 37 x 10 -4
Refractive index(λ = 587.6 nm) nd 1,473
Stress-optical coefficient (DIN 52 314) K 4,0 x 10-6 mm2 x N-1



















Package Includes:
  • 4 pcs   6 x 200 mm glass stirring rod
Payment

We accept payment by Paypal. It's a safe and faster pay method for both of us.


Shipping
All items will be shipped from Hungary on the same or the following day.
Items will be shipped via Hungarian Post and it will take about:

    1-4 working days     in the UK
    4-5 working days     in Europe, UK,
10-20 working days     Rest of the world
 
Before you pay, please make sure your address in PayPal matches the address you would like us to ship to and your phone number is helpful for delivery.


We promise :
All the goods will be checked strictly one by one before we send the order to you. So the quality will be ensured.


Returns & Refund
If you cancel the order on the same day when you ordered it, we will give you a full refund.
If you just changed your mind, and you require a refund, you have to send the item back on your cost and once we received the returned item than we will only refund the item price.
If your item didn't arrive in one piece than you have to prove it with a photo with the packaging and it would be up to you that you would us to resend the item or you just want a refund.


We hope the feedback will be left once you received the item.        Please contact us before leaving bad feedback as we can solve most problems.

Please send us on Ebay a messages if you have any question. We will reply you as soon as possible.