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Plexiglass method of embedding insect specimens
- Jan 22, 2018 -

Using methyl methacrylate (commonly known as plexiglass), the insect specimens buried up, made of a kind of artificial amber insect specimens. Advantages are not afraid of moth-eaten, do not produce enzymes and avoid the advantages of damage, due to transparency, easy to observe, as an exhibition, teaching materials are particularly suitable.

Materials and Tools:

Production of organic glass embedded raw materials, raw materials purchased from the chemical raw materials store, cooked monomer. ⑴ raw monomer, is not polymerized methyl methacrylate, a colorless and transparent liquid, when the specimen from the role of solvent. ⑵ cooked monomer, is a polymerized methyl methacrylate, a colorless and transparent viscous liquid, only 5 degrees Celsius at low temperatures to maintain the original character, that is, under high temperature polymerization hardening. Therefore, the raw and cooked monomers should Sheng Sheng large glass stopper jar, placed in the refrigerator to save; for the convenience of application and avoid improper disposal of waste materials, available two 50 ml small jars, inverted part Monomer for use at any time.

Prepare the embedded insect specimen:

The best choice of limbs, bright color, the outer skin is relatively hard, such as Coleoptera, Orthoptera, Hemiptera, Hymenoptera and Lepidoptera adults, larger insects, internal organs and various insect larvae Can be used to embed, just because of water content, the procedures required more complicated. No matter what kind of insects embedded, we must do a good job in advance posture and cleaning work in order to improve clarity and aesthetics.

Molding:

Appliances are glass (bottom) and glass (edge). Molding depends on the external shape of the plexiglass embedding specimens: square, rectangular, diamond (if made into a circle, you can also choose different sizes of good quality flat-bottom glass, as a mold). After deciding on the shape of the mold, first scrub the required glass molds cleanly, and check them repeatedly, the surface has scratches or fuzzing can not be used, in order to avoid the difficulties in the mold release or the surface of the burying blocks which are made out of the flat surface . Mold, the first in the glass under the pad of a grid of paper, in order to use glass slide surrounded by another satisfactory shape. Then tweezers dipped in a little cooked monomer drops in the slide above the seams so that it along the seam along the flow of their own downstream will be glued seam, so the adhesive treatment to be carried out twice. Then placed in a thermostat at 40 degrees Celsius for about half an hour, the cooked monomer polymerization hardening.

The mold is made, you can inject 4-5 mm cooked monomer (not too thick, so as not to dissolve the seams at the adhesive, if the bubble with a dissection needle to puncture). It was polymerized and hardened for 12 hours in warm incense at 40 degrees Celsius to serve as a fixed layer. If the injection several times, the thickness of the hardened monomer is not less than 3 mm. To mark the name of the insect entrapped, a label soaked in virgin monomer, clearly drawn in the graphic inks, is placed in the cooked monomer prior to the second injection of the cooked monomer. The position to be placed depends on the situation.

Embedding:

First through the entire capital of the dried insect specimens, immersed in raw monomer for about an hour, so that parasites completely soaked. At this moment, the cooked monomer is injected into the prepared mold, but this time the amount should not exceed half of the thickness of the insect body so as to avoid the drift body after the specimen is placed. Then remove the specimen from the raw monomer, the insect body back down, on the cooked monomer in the mold. Tweezers or dissection needles to adjust the position of the specimen, to be stable, moved to a glass-covered box, to avoid dust for the future observation. Although this polymerization for a long time, but not easy to produce bubbles. 2 days later with a dissection needle probe, when the cooked monomer has been polymerized into a semi-solid state has not yet fully hardened, you can then add 5 mm of cooked monomer. After every 1-2 days after the above method to check and then add cooked monomer. However, the best injection from the end of the injection into the mold, so as to avoid irregular injection squeeze each other to produce difficult to discharge gas.

Mold release:

After stripping, available scissors, steel frustration, grinding stone dressing, especially the last part of the polymerization. After trimming, some parts will lose their luster and can be polished with cloth * polishing machine.