More about this product
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Features:
 Over three times the strength-to-weight of plain cardboard tubes
Up to 40% lighter than cardboard or aluminum tubes
Inside wall lined with flocked light trap
Economical optical tube solution
Easy to cut and drill
Moisture resistant
Excellent thermal properties
BlackLite tubes are specifically designed to be telescope tubes, and the diameter, rigidity, optical and thermal properties all have that purpose in mind. BlackLite tubes have Protostar flocked light trap material integrated into the interior tube wall during manufacture, saving you the time and expense of separately installing flocking. The hard exterior is ready-to-paint, or it can be used unpainted.
Phenolic is impregnated into the kraft paper construction resulting in over five times the compression strength of cardboard alone. The tubes are up to 50% lighter than cardboard, and up to 40% lighter than typical aluminum tubes.
BlackLite tubes are easy to cut, drill, sand, and finish. The edges and focuser holes cut and drill cleanly. The surface of the tube is harder and smoother than cardboard. Since the phenolic resin makes the tube water resistant, painting is not necessary, but painting is also a breeze (download "Finishing & Painting BlackLite tubes"). The spiral wound layers are not overlapped, which improves the appearance and also permits the tube to rotate smoothly within rotating mounting rings.
Tubes are available for 6", 8", and 10" Newtonian telescopes. Single tubes up to 48" long, and two-piece tubes up to 80-inches) are available. The joint is stronger than the tube, so there is no sacrifice in rigidity. Shipping only within the U.S.A. Made in the U.S.A.
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One-piece tubes up to 48 inches long are available. |
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Longer tubes up to 80 inches can be constructed by joining two BlackLite tube sections with the supplied external coupler. |
Optional accessories
Tube mounting rings, end trim, custom end caps, slip-on light shields, and other accessories are available for BlackLite tubes.
Specifications
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BL-01
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BL-03
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BL-8
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BL-10
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BL-12
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Inside diameter
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1.41 in.
(36 mm)
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3.23 in.
(83 mm)
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7.65 in.
(194 mm)
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9.65 in.
(245 mm)
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11.45 in.
(291 mm)
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Wall thickness
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0.06 in.
(1.5 mm)
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0.08 in.
(2.2 mm)
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0.12 in.
(2.8 mm)
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0.13 in.
(3.0 mm)
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0.16 in.
(3.6 mm)
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Outside diameter (nominal)
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1.53 in.
(39 mm)
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3.40 in.
(86 mm)
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7.90 in.
(201 mm)
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9.91 in.
(252 mm)
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11.77 in.
(299 mm)
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Weight per length
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0.10 lbs/ft
(1.5 g/cm)
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0.31lbs/ft
(4.6 g/cm)
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1.0 lbs/ft
(15 g/cm)
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1.3 lbs/ft
(19 g/cm)
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1.8 lbs/ft
(27 g/cm)
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Total weight of 48" long tube
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0.41 lbs
(0.19 kg)
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1.25 lbs
(0.57 kg)
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4.0 lbs
(1.82 kg)
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5.2 lbs
(2.37 kg)
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7.2 lbs
(3.28 kg)
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Modulus of elasticity, E
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1400 ksi
(9.65 GPa)
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Inside wall reflectivity
(Avg visible @ 0º AOI)
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Black flocked; <0.4% of visible light
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Inside wall reflectivity
(Avg visible @ 80º AOI)
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Black flocked; <0.7% of visible light
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Thermal conductivity, k
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0.23 W/m.K
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Thermal expansion
coefficient (1/ ºF)
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8.0 x 10(-6)
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Design temperature range
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-25 to 170 º F
(-30 to 75 ºC)
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See 
1.5" dia. BlackLite tube; 48" long