Skeptoid: Digital vs Vinyl Reply #50 – 2012-04-07 00:20:13 QuoteTo determine the actual deformation-force relations, complex groove impedances have been measured as a function of tracking force, groove speed, etc.QuoteAt high bearing loads complete plastic flow sets in and the needle leaves a permanent indentation track, while at lower loads the elastic deformation is predominant.Exactly my contention versus categorical statements by those arguing from authority. Thanks.It would be nice to know from the original paper what they found to be the tracking force where elastic deformation is dominant vs. permanent deformation.QuoteI'm just pointing out that your belief that the practice is harmless is not supported by the facts.I still play records wet with good results that I have owned and played back wet since the late sixties and early seventies.If there is any harm, then it is offset by reducing problems with static, a record that is cleaned during playback etc.It should also be mentioned that the development of heat during the playback is likely significantly reduced by a cooling agent, be it water alone or in a mix of alcohol (isoprop), thus further reducing the risk of permanent deformation. QuoteRepeated playback (no matter what the timeframe) carries the risk of permanent damage. Obviously, records are observed to wear out with repeated play. No published evidence exists of back-to-back playback causing any more permanent damage than if repeated plays are separated by any longer period of time.from the horses mouth itself: http://wiki.hydrogenaudio.org/index.php?ti...inyl_has_cooledAs to plasticizers in pvc:I could not find any reference as to what plasticizers are used in PVC specifically for vinyl records. Or that Vinyl acetate was specifically used at all. Quotehttp://onlinelibrary.wiley.com/doi/10.1002...010508/abstractQuotePolyvinyl chloride acetate (PVCA) is a thermoplastic copolymer of vinyl chloride and vinyl acetate. It is used in the manufacture of electrical insulation, of protective coverings (including garments), and of credit cards and swipe cards. http://en.wikipedia.org/wiki/Polyvinyl_chloride_acetateQuote. The most common plasticizers are derivatives of phthalic acid. The materials are selected on their compatibility with the polymer, their low volatility, their low toxicity, and their cost. http://en.wikipedia.org/wiki/Polyvinyl_chl...er_applicationsQuoteCopolymers of ethylene and vinyl acetate (E-VA) of a certain composition can be used for the improvement of impact properties (elasticisation) of PVC as well as under certain conditions (grafting) for the preparation of flexible PVC (plasticisation). Products of interesting properties are prepared by blending E-VA (up to ∼ 12%) with PVC or more advantageously by grafting vinyl chloride on special E-VA types. Graft copolymerisation by the suspension method allows the synthesis of E-VA/PVC systems in all ratios (up to 80% E-VA); these polymers are compatible over the whole range in contrast to the blends.http://onlinelibrary.wiley.com/doi/10.1002...010508/abstractQuotePlasticizersIt has been claimed that some plasticizers leach out of PVC products. However plasticizers do not readily migrate and leach into the environment from flexible vinyl articles because they are physically and tightly bound into the plastic as a result of the heating process used to make PVC particles. http://en.wikipedia.org/wiki/Polyvinyl_chlorideSo again the study by the so called scientists by Discwasher seems to be more than flawed and not worthy any consideration imo.