Plastic classification

Table 11 [8] compares the properties of TPE classes. See Table 6 in Chapter Plastics Classification, Characterization, and Economic Data for the abbreviations. 

Classification System for Automotive Acetal (POM) Plastics. Classification System for Automotive Polycarbonate Plastics. Classification System for Automotive Polyethylene Plastics. Classification System for Automotive Poly(Phenylene ether) (PPE)... 

FIGURE 36.2 Schematic representation of a multilayer network. For waste plastic classification, spectral reflectance values provide inputs (IN) into the network. Two hidden layers HIDl and HID2 are used, composed of a variable number of nodes. The ontpnts of the network (OUT), indicate the resin from which the spectrum was collected. 

Examples of some of the more common plasticizers and their classifications are listed in Table 24.2. Often a plasticizer can be placed in multiple classifications. For example, linear phthalates are recognized for both their low temperature performance and low volatility. In addition some specialty plasticizers could also fit in the fast fast-fusing plasticizers classification. 

There are two primary technologies to create a flexible PVC product either one can add a flexibilizer or a plasticizer to the PVC polymer or one can chemically modify the PVC molecule. For the formulator, the preferred method is to add an external plasticizer. External plasticization describes the addition of a plasticizer to the rigid polymer, where the level of flexibility can be adjusted by both the type and level of the plasticizer. The choice of plasticizer can be complex because of the wide variety of products available and the different effects that can be achieved. To simplify the plasticizer choice selection, several plasticizer classification schemes have been developed. 

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