Speakers Corner

Thanks whart. That's a highly informative post. I don't believe I read anything about Clarity vinyl, but that's also quite interesting and I'm surprised that manufacturers haven't followed up on it. I have to wonder though if a mold release agent is already present in the PVC pellets prior to being pressed would this necessarily affect the release of the record from the mold if it lies buried inside the record during the pressing process? Is it possible to clean this agent from the record if it is present during the entire process? Do thermal stabilizers also affect the sonics of the final product? Are those also removed during normal record cleaning?

In any case, I am going to investigate more of what the label offers in my areas of interest.

Wash- it’s all part and parcel of the compound. With modern plants, as I understand it, the pellets are melted and extruded into nuggets/biscuits and that is what gets put onto the press. It’s not like the mold release is a liquid blob inside the nugget, it is all mixed together with various other materials that all perform different functions. I’m not a chemist or materials scientist, so the best I can do is tell you what I can glean from the old papers or patents- issues like "flow," stability, surface noise, evenness of heat application, discoloration- I can point you to some of the papers- some are only available through the AES by paid download or subscription to their library. One scientist was at RCA, and had written extensively on what was necessary to make a "modern" LP circa the ’70s. That wonderful JVC formulation used in the old MoFi’s was originally developed for Quad LPs.
There are clearly some sonic differences I would attribute to the vinyl used, but couldn’t tell you what role the constituent elements played. And no, as far as I know, none of this stuff would (or should) get removed by cleaning. The biggest issue I can think of-- which isn’t all that common, but occurs- is a chemical interaction between certain plastics and the record- for example, PVC outer record sleeves, which have plasticizers in them to make them soft. Those plasticizers will leach (through the cardboard jacket, the inner sleeve and onto the record itself) and in some cases, create a haze on the record that you can see and will affect sonics. I suspect it is also exacerbated by heat, i.e. storing the records in an attic. Cleaning won’t get rid of that- but that’s a chemical reaction- it’s like the off-gassing of the stuff in car dashboards that makes your windshield hazy.

Speakers Corner is one of the last great Lp reissue companies.

There are threads on mold release compound, what it is, if it exists at all, etc.

Do a search!

IMO it is nothing to worry about. 

If you clean before first play, its up to you.  I do not, except if the Lp is used.

OK. Here's the email I received from the representative of the company:

"thank you very much for your inquiry.

Our records are being pressed since more than 20 years at Pallas in Diepholz (Germany), no exception. Although our productions feature both longer pressing and cooling times plus a manual inspection of every single LP, the manufacturing process does not differ from other LPs made at Pallas - and they do not use any kind of release compound. Therefore there is no need to wash a LP made by Pallas.

I have heard from customers having removed static charge of the LP by washing it. Admittedly Pallas pressings are prone to that since they use a very clean vinyl without any additives, but if the turntable is properly earthed, this is not an issue.

To cut a long story short: there is no benefit in washing a factory sealed release from us.

Thank you very much for your interest in our productions and best regards,

Kai Seemann"

"Very clean vinyl without any additives"

"They do not use any kind of release compound"

"I can point you to some of the papers- some are only available through the AES by paid download or subscription to their library."

Thanks again Whart. I think that would be too much information for me to need. I'll take the general overview on the issue without too much technicality. I have far too many other topics that I need or want to know with a great deal of technicality.