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| Pollen
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The yellow dust produced by the anters. It is the male element which fertilized the ovule. |
| Pollination
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The transfer of pollen from the stamen (male part of the flower) to the pistil (female part of the flower), which results in the formation of a seed. Hybrids are created when the pollen from one kind of plant is used to pollinate and entirely different variety, resulting in a new plant altogether. |
| Polybutene tape
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Mastic type of tape, used to seal windowpanes, which is non-hardening. |
| Polybutylene (pb)
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A flexible plastic tubing used in water supply systems where allowed by code. Also, polished brass finish on faucets. |
| Polycrystalline
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A semiconductor (photovoltaic) material composed of variously oriented, small, individual crystals. |
| Polyester
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Any of numerous synthetic polymers produced chiefly by reaction of dibasic acids with Dihydric alcohols and used primarily as light, strong, weather-resistant resins. In roofing, polyester is used to reinforce fabrics. |
| Polyethylene
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Thermosetting plastic, which when used as tubing, is flexible and easy to work with. It is also corrosion resistant so that it can be used to transport chemicals. Since it is also resistant to deterioration upon exposure to ultraviolet light, it can be used for exterior purposes, unlike PVC which must be protectively coated. |
| Polygon
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A closed plane figure with more than four sides and angles. |
| Polymer
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Any of numerous natural and synthetic compounds of usually high molecular weight consisting of up to millions of repeated linked units, each a relatively light and simple molecule. |
| Polymeric methylene diphenyl diisocyanate (pmdi)
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The "A" component in SPF; when mixed with "B", it forms polyurethane. PMDI is an organic chemical compound having two reactive Isocyanate (-N=C=O) groups. |
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