Light permeability

Figure 2 Light permeability of polyolefins after quenching (1-4) and of nonquenched samples (l -4 ) l,l -poly-propylene (PP) 2,2 -high-pressure polyethylene (HPPE) 3,3 -low-pressure polyethylene (LPPE) 4,4 -medium-pres-sure polyethylene (MPPE). Film thickness-150 fic moulding time-10 minutes, moulding pressure HPPE-160°C LPPE, MPPE, PP-190-200X.

Figure 3 Light permeability of the high-pressure polyethylene sample as a function of thickness I-3-quenched polyethylene 4-6-normal polyethylene 1 and 4-50 jlc thick 2 and 5-200 /jlc thick 3 and 6-350 fic thick.

Figure 4 Light permeability of polypropylene as a function of the sample thickness 1-3-quenched polypropylene 4-6-normal polypropylene 1 and 4-100 /ac thick 2 and 5-150 jLtc thick 3 and 6-500 /jlc thick.

Useability of a transparent polyethylene film in hotbeds and greenhouses is obvious, since this film, as opposed to glass, displays high light permeability in the ultraviolet spectral region. 

Phosphors for cathode-ray tubes, television screens, monitor screens, radar screens, and oscilloscopes are tested under electron excitation. Electron energy and density should be similar to the conditions of the tube in which the screen will be used. The phosphors are sedimented or brushed onto light-permeable screens and coated with an evaporated aluminum coating to dissipate charge. The luminescence brightness and color of the emitted light are measured with optical instruments such as photomultipliers or spectrophotometers. 

A runway treated with GKZh will never be covered with ice. Water slides like mercury off its surface. Covering windshields of airplanes and automobiles with a thin layer of silicone liquid or varnish prevents ice and mist formation. Silicone compositions are used to cover lenses and optical glass to improve light permeability and resistance to atmospheric effects. Oligomethylsiloxanes are used for the outer covering of glass fluorescent lamps to keep dust off the surface. 

Figure 1 Light permeability of brown glass containers. (1) Ampoule glass (2) Tablet glass containers (3) Infusion bottle. Source From Ref. 5.

Hydrogels are used in photographic technology because they are light-permeable and can also store light-sensitive substances. 

The hydrophobic PVDF membranes are mechanically and chemically stable. They are suited for protein staining, immunostaining, lectin staining, and Ca + staining, as well as for amino acid sequencing and analyses. Similar conditions apply to blot and development as to nitrocellulose, but in contrast to nitrocellulose the PVDF membrane does not completely bind even tiny amounts of protein. Depending on the protein, 10 to 50% passes the membrane unbound. Watery solutions do not moisten dry PVDF membranes. The membranes first have to soak in methanol. Moist PVDF membranes are light-permeable and transparent in dioxan isobutanol. Stained bands can also be measured in the scanner. 

CHs/l.OOO C atoms 200 °C) Elongation at rupture) Light permeability) Gas permeability)... 

Because of the partial high light permeability of the membrane material, using single-layer foils or textile membranes sometimes proves to be more... 

In some cases the coated textile also has to fulfill climate functions by retention of warmth or showing only certain light-permeability capacities. 

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