milky quartz domed glass tube for planting Quality Choice

Al

Ca

Fe

Cu

Mg

Mn

4.2

1.53

0.6

0.02

0.157

0.01

Purity (Sio2)

99.82

Density 20 Kg.m3(×103) 

2.06-2.148

Shock Resistance KG/CM2 

0.85

Softening Point

1600±40

Annealing Point

1120±25

Strain Point

1025±25

Hardness MohS

5-6

Dispute Pressure Intension Mpa

41348130

Inductivity Kv/MM

3.5

Resistance

10 (20)

Range of Out-Diameter

8≤φ≤16

17≤φ≤25

26≤φ≤35

φ≥36

Out-Diameter Deviation

±0.30

±0.50

±0.70

±1.00

Note:
1. the tubes, with both end open and one end open, are available. The Out-diameter of the dome end, if so, should not be over the Out-diameter of the tube.
2. For the tubes with special dimensions, it needs to be discussed by the both sides of supplier and customer.

Range of Wall thickness

0.8~1.5

1.6~3.0

≥3.1

Deviation of Wall Thickness

±0.10

0.20

0.30

Note:
1. The tubes, with both end open and one end open, are available. The wall thickness of the dome end, if so, should not be less than three-fourth of the wall thickness of the tube.
2. For the tubes with special dimensions, it needs to be discussed by the both sides of supplier and customer.

Elliptcity

Not over the absolute value of OD deviation

Length

Decided by the supplier and customer, however the tolerance should not be over ±1mm

Deviation of Wall Thickness

Not over the absolute value of wall thickness deviation

Angularity

Not over 3% of the tube length

Surface Dirties

There must not be dirties on the inner surface. Without any obvious finger prints. Without obvious adhered materials caused when cutting; within the range of 300mm, obvious concentrated area of water marks cause when cutting should not be more than one; within the range of 300mm, the inner dirty area and small dirty pits should not be over 2mm.

Scuffings and Nicks

The total axial-direction scuffing length should not be over two times of the total length of the tube; and the total round scuffing length should not be over two times of the circumference of the tube. The length of the nick should not be over 12.5mm within the range of 300mm, and the nick length should not be over the circumference of the tube.