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2. Polystyrene - Wikipedia

   en.wikipedia.org/wiki/Polystyrene

   Polystyrene (PS) / ˌ p ɒ l i ˈ s t aɪ r iː n / is a synthetic polymer made from monomers of the aromatic hydrocarbon styrene. [5] Polystyrene can be solid or foamed. General-purpose polystyrene is clear, hard, and brittle. It is an inexpensive resin per unit weight. It is a poor barrier to air and water vapor and has a relatively low ...

3. Styrofoam - Wikipedia

   en.wikipedia.org/wiki/Styrofoam

   Styrofoam insulation extruded polystyrene foam (XPS), owned and manufactured by DuPont. Styrofoam is a genericized trademarked brand of closed-cell extruded polystyrene foam (XPS), manufactured to provide continuous building insulation board used in walls, roofs, and foundations as thermal insulation and as a water barrier.

4. Polymeric foam - Wikipedia

   en.wikipedia.org/wiki/Polymeric_foam

   Polystyrene#Foams (PS) foam Expanded polystyrene (EPS) Extruded polystyrene foam (XPS), sometimes sold under brand name Styrofoam; sometimes polystyrene paper (PSP) Polyurethane (PU) foam. LRPu low-resilience polyurethane; Memory foam; Sorbothane; Polyurea foam; Polyethylene foam, as used in PEF rod; Polyvinyl chloride (PVC) foam Closed-cell ...

5. Phase-out of polystyrene foam - Wikipedia

   en.wikipedia.org/wiki/Phase-out_of_polystyrene_foam

   Expanded polystyrene, often termed Styrofoam, is a contributor of microplastics from both land and maritime activities. Polystyrene is not biodegradeable but is susceptible to photo-oxidation, and degrades slowly in the ocean as microplastic marine debris. Animals do not recognize polystyrene foam as an artificial material, may mistake it for ...

6. Plastic - Wikipedia

   en.wikipedia.org/wiki/Plastic

   Thermoplastics do not undergo chemical change in their composition when heated and thus can be molded repeatedly. Examples include polyethylene (PE), polypropylene (PP), polystyrene (PS), and polyvinyl chloride (PVC). [13] Thermosets, or thermosetting polymers, can melt and take shape only once: after they have solidified, they stay solid. [14]

7. Recycling codes - Wikipedia

   en.wikipedia.org/wiki/Recycling_codes

   Recycling codes on products. Recycling codes are used to identify the materials out of which the item is made, to facilitate easier recycling process.The presence on an item of a recycling code, a chasing arrows logo, or a resin code, is not an automatic indicator that a material is recyclable; it is an explanation of what the item is made of.

8. Resin identification code - Wikipedia

   en.wikipedia.org/wiki/Resin_identification_code

   6: polystyrene (PS) (plastic utensils, Styrofoam, cafeteria trays, etc.) 7: Other (N/A) other plastics, such as acrylic, nylon and polycarbonate. When a number is omitted, the arrows arranged in a triangle resemble the universal recycling symbol, a generic indicator of recyclability. Subsequent revisions to the RIC have replaced the arrows with ...

9. Evaporative-pattern casting - Wikipedia

   en.wikipedia.org/wiki/Evaporative-pattern_casting

   The most common evaporative-pattern material used is polystyrene foam. [1] The two major evaporative-pattern casting processes are: [1] Lost-foam casting; Full-mold casting; The main difference is that lost-foam casting uses an unbonded sand and full-mold casting uses a bonded sand (or green sand). Because this difference is quite small there ...