technical conditions from the manufacturer

length

standard lengths:

rod
diameter 3-6 mm - 1500 ± 20 mm
diameter 7-16 mm - 1500 ± 10 mm
diameter 18-30 mm - 1500 ± 30 mm

capillary
1500 ± 10 mm

tubes
1500+10 mm
-0 mm

non-circular assortment
1500 ± 20 mm

Non standard lengths: both shorter and longer lengths can be produced to suit special requirements. For example; depending on outside diameter and wall thickness, we can produce tubing up to 12 metres in length. Inquiries are most welcome.

out-of-roundness

Out-of-Roundness according to ISO 1101 depends on the outer diameter. The following limit values are fixed:

tube
Ø <180 mm
smax 0,7 % of the outer diameter

capillary
Ø <10 mm
smax 1,0 % of the outer diameter

rod
Ø <20 mm 
smax 1,0 % of the outer diameter
20 mm ≤ Ø ≤30 
smax 1,5 % of the outer diameter

wall thickness variance

The difference between the maximum and minimum wall thickness at arbitrary point of a tube may not exceed 12 percent of the wall nominal thickness.

deflection

tubes deflection acc. to ISO 1101:
outer diameter 4 to <6 mm
→ max. 4,0 mm/1500 mm
outer diameter ≥6 to <30 mm
→ max. 1,5 mm/1000 mm
outer diameter ≥30 to <100 mm
→ max. 2,0 mm/1400 mm
outer diameter ≥100 to ≤180 mm
→ max. 2,5 mm/1400 mm

Rods and capillaries are supplied with deflection of maximum 4 mm over 1500 mm of the product length.

Non-circular assortment is supplied as follows:
tubes with deflection of max. 0,4% of nominal length as well as capillaries and rods with deflection of maximum 0,6% of nominal length.

stress

tubes

Rods are not normally annealed, however, rods 18 to 30 mm diameter can be delivered annealed, if requested by the customer.

Profiles, and capillary tubes are not anneal

stones and tails

The grain size is considered as corresponding to stones or tail size.

stones sizes:
< 0,3 mm
≥0.3-<1.0 mm
≥1.0-≤2.0 mm
>2.0 mm

per 1 kg  of glass
permitted
max. 2
max. 1
prohibited

tails sizes:
<0,3 mm
≥0.3-<1.0 mm
≥ .0-≤3.0 mm
>3.0 mm 

per 1 kg of glass 
permitted
max. 4
max. 2
prohibited

bubbles

length:
Bubbles length corresponds to the length of all bubbles ≥20 mm.
Permitted length of bubbles is 0,8 m/ 10 m of a tube. Bubbles <20 mm: 20 pcs/1 kg of glass.


width
Bubbles wider than 1 mm are prohibited in tubes with a diameter of Ø ≤100 mm
Bubbles wider than 2 mm are prohibited in tubes with a diameter of Ø >100 mm 


NOTE:
capillary bubble is a bubble drawn in the direction of the length of a product in the form of a capillary with a length greater than 2 mm.

end finish and front surfaces perpendicularity deviation

tubes
4 ≤ Ø ≤  5 
5 < Ø ≤ 100 
100 < Ø ≤ 180

tube ends
not flame polsihed
flame polished
flame polsihed

front surfaces perpendicularity deviation
 –
2,5
4,0

In flame polishing the ends, wall thickness may get enlarged by 0.1 mm.

Capillaries, rods and the profiles are not flame polished at the ends, with the exception of tubes fluted inside, which are flame polished at the ends.

packaging

Products are supplied in conveniently sized cartons, with sufficient protection against damage in transportation and storage.