Subject volume resistivity

The volume resistivity of polytetrafluoroethylene remains unchanged even after a prolonged soaking in water, because it does not absorb water. The surface arc-resistance of PTFE resins is high and is not affected by heat aging. They do not track or form a carbonized path when subjected to a surface arc in air [39]. The electrical properties of PTFE are summarized in Table 3.6. 

The requirements for the press-in zone of a press-in pin are high. The connection between the plated via and the press-in pin must be gas-tight, without the plated hole being subjected to excessive strain. A pin must also test to a certain holding force and must not exceed a maximum permissible volume resistance. Even an elastic press-in pin will undergo some degree of plastic deformation when pressed into a through-hole of small diameter close to the bottom limit of tolerance, so even elastic pins can be pressed in only once. In a sleeved hole, by contrast, a new pin can be inserted in the event of repair or replacement. [37]... 

These test procedures and standards are subject to change, so it is essential to keep up to date if one has to comply with them. It may be possible to obtain the latest issue on a specific test (such as a simple tensile test or a molecular weight test) by contacting the organization that issued it. For example, the ASTM issues new annual standards that include all changes. Their Annual Books of ASTM Standards contain more than seven thousand standards published in sixty-six volumes that include different materials and products. There are four volumes specifically on plastics 08.01-Plastics 1 08.02-Plastics 11 08.03-Plastics III, and 08.04-Plastic Pipe and Building Products. Other volumes include information on plastics and RPs. The complete ASTM index are listed under different categories for the different products, types of tests (by environment, chemical resistance, etc.), statistical analyses of different test data, and so on (56,128,129). 

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