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July 22, 2007



Hello Elio,I am a student atnindetg UC Davis one of the few UC's that doesn't offer advanced courses in Solidworks nor mold design. I have a few patents pending and would like to develop my own molds partially to bring my devices to market but also to assist me in gaining admittance to the school of engineering. I have spent the past 4 weeks, 8-10 hours a day, in my office educating myself on how to design plastic parts. I am now several chapters into General Design Principals for DuPont Polymers and feel ready to begin developing my skills at mold making. Yet, as you mentioned in one of your posts, there is very little affordable documentation on the process.Would it be alright if I were to seek your guidance as a mentor while I try to learn all that I can? Question that come to mind immediately are: how does one determine the placement of ejection pins; are there limitations to their placement or quantity; why would anyone choose ejection pins over gas ejection; does one have to design the mold with ejection speed taken into account or is that dependent entirely on cooling rate?Best Regards,Paul Riggs

mold inspection Toronto

Run an Internet search on the subject of “toxic mold,” and you are likely to find quickly that there is little middle ground on this controversial subject. Depending on where your mouse clicks take you, you will be told of the frightening, potentially fatal health effects of exposure to an underestimated menace—or you will be told of a scourge of money-grubbing lawyers and clients perverting science in the name of financial gain.

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Mold can trigger an allergic reaction and asthma in sensitized individuals (repeated exposure to mold or mold spores sometimes causes previously non-sensitive individuals to become sensitized). About 15 million Americans are allergic to mold. The most common reactions are flu-like symptoms and asthma. Those with chronic lung or immune problems, are at risk for more serious reactions like fever, lung infections and a pneumonia-like illness.

Some toxic molds such as Aspergillus, Cladosporium, Penicillium, Stachybotrys, and Trichoderma produce mycotoxins capable of causing severe health problems.

When mold grows indoors in moist organic materials, building occupants may begin to notice odors and suffer a variety of health problems associated with mold exposure.

Dan with Mold removal company

DIY Mold Test

Toxic molds can indeed affect your health in a very bad way, specially the respiratory tract. People who have asthma problem should be highly careful about these molds.

mold remediation

Excellent site! Many of our inspections are now demanded by attorneys for their clients against landlords who are aware,but do nothing to fix the problem.

Black Mold Removal

Molds attack the respiratory tract specially asthma is very very common with mold around in the house.

Home Inspector Tampa FL

A very nice article...toxic mold are hard to handle and sometimes can notbe managed without expert service.

Jeff Harwood

Toxic mold found at Riverstone's Jefferson Lake Apartment. Find out more at twusea.org (not Spam)


I imagine there will never be PELs for mold. There may certainly be PELs for mycellar fragments, or perhaps if analyctical methods are developed then perhaps for individual mycotoxins or other mold related byproducts. PELs are going to be challenging because for most molds there is no clear dose/response curve.

It is somewhat premature though I think to suggest that there are no possible lingering health effects from mold exposure. Given what we now know about various chemicals and hazardous substance, and long lasting health effects associated with oversposure to them, it is not outside the realm of possibility to believe that mold in some case may do the same.


Jeremy Schaefer

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