The Comparative Safety of Rockwool, Fiberglass, and ...

• Money corrupts. Regulatory agencies typically are formed and shaped by the same corporate interests that bribe our politicians with legal campaign donations and dark money. Those corporate interests subsequently lobby those same politicians for the passage of lengthy and favorable regulatory legislation. The legislation is informed by think-tank industry propaganda and written by political action committees before being voted on without any legislators actually reading it. We can't take any studies that are published by manufacturers or trade groups about their own products at face value any more than we can take industry regulation based on those studies at face value.
• Safety in one frame is not safety in all frames. Smoking is known to drastically enhance the carcinogenicity and fibrogenicity of asbestos exposure.
• The studies of fibers mentioned here do state that as the binders degrade in the lung, the larger clumped fibers break down into smaller fibers that are too small to be expelled by cilia and mucous. They don't state that those fibers are dissolved and eliminated completely. Probably some of them are, however, the quotes I read throughout this thread do not state that all the material is expelled. They merely note that the original fiber composition is no longer present. They do however indicate that under extreme lifelong exposure, prominent scarring is noted. I think it's premature to assume that since no prominent scarring is noted on visual inspection after mild to moderate exposure, that means that breathing is completely unaffected. Athletes in professional aerobic sports competition might have different perception of risk than the average couch potato. Do the studies asses tested lung capacity? I didn't see any quotes here from these studies that they actually measured the efficiency of lung tissue to determine if there was any practical degradation of gas exchange once lung tissue was partially obstructed by debris. If these studies overlooked the single most obvious metric, one must question the design of the studies.
• Individual variation is not merely real, it is also prevalent because we are all individuals.
• Chronic exposure to small quantities of contaminants is often far worse than a single exposure to a large quantity of contaminants. Residual leakage of small amounts of dust is dangerous in proportion to the length of the ongoing chronic exposure. Since man-caves and recording studios tend to be cluttered dust traps that are difficult to clean properly and are also painstakingly reconfigured at regular intervals for new gear, the amount of personal time and energy available for dusting and vacuuming is reduced. The degree of organization and the amount of space available for maintenance could be equally important to the level of hazard as how well the noxious dust is contained.
• Ultra high frequency reflectivity from gasflow resistivity must be weighed against the quantum effects of thin floppy membranes that may absorb or pass higher frequencies to a large degree. We accept low frequency reflectivity as a given and manage it through other means (primarily placement), but regarding high frequency reflectivity, the most prominent characteristic of highly treated environments is not how much they reflect the treble but rather how much they suck out the treble with absorption and diffusion/scattering, particularly regarding the reverberant field. Fiberglass batt wrapped in craft paper is marginally less absorptive of high frequencies than bare fiberglass, but even the paper covering produces some high frequency absorption. Adding a thin layer of 'acoustically transparent' grill cloth over speakers causes enough treble attenuation that some find it objectionable, whereas in blinded testing at Harman all speakers are placed behind that same grill cloth to prevent the audience from perceiving which speaker is moved forward by the robotic conveyor. Nobody has complained about that grill in the popular literature so far. Placing batts in plastic bags shouldn't make much difference since very high frequencies above 10KHz are the first to go as we age, and barely contribute any acoustic power or acoustic imaging to perception. Technically, yes, practically, no?
• Polytheylene fibers are not necessarily harmless. Even though bed pillows and comforters are stuffed with them, that doesn't mean they are safe. A prime measure of the quality of bedding is maximal threads per inch in the tightness of the weave. The comforter wrapped around a frame of curtain rods that is mounted in front of my stone fireplace mantle is one of the cheapest on the market especially because the cheap black covering is highly porous open weave for best acoustic absorption. Life is full of risks that are not well understood.
• Civilian populations are replete with damaged victims of industrial living. Because there are so many potential sources of exposure, it is difficult to say which exposure caused a particular illness or syndrome. What is taken for granted today as 'normal' health is substandard by comparison to the primitive hunter-gatherer who can climb tall trees to forage and hunt well into advanced age whereas industrial citizens have difficulty climbing stairs from arthritic or diabetic degeneration and cardiopulmonary problems. Agricultural populations tend to be smaller, weaker, less healthy, more prone to tooth and gum disease, more prone to cancers and autoimmune disorders, and less resistant to pathogens and parasites than indigenous primitive hunter-gatherer populations. Where industrial living excels is in preserving life through the risky infant, toddler, and adolescent stages that tend to weed out weaker individuals through natural selection (a combination of susceptibility and random chance). We can't take current health standards as the gold standard for what constitutes exposure damage. Just because we all live in buildings with contaminants and nobody is protesting in the streets about the risks of exposure doesn't mean that nobody is affected by such exposure. The truth is that modern living has exposed us all to so many potential damage-inducing substances that we wouldn't be able to separate out the variables even if we tried.
• One example of how industrial standards don't necessarily apply to AVphile enthusiasts is the OSHA environmental noise standard. This standard is designed to protect speech intelligibility so that factory workers can communicate with each other even after prolonged exposure to damage-inducing sound levels, and also to essentially guarantee that such factory workers have no chance of successfully suing an employer who follows the standard. OSHA was not designed to protect optimal hearing with no loss of response. For any AVphile wishing to continue the enjoyment, assessment, and mixing/mastering of professional audio productions into advancing age where natural degeneration is problematic enough even without environmental insult, OSHA is not a valid standard. AVphiles routinely expose themselves to extended sessions of harmful reference level (or above) SPL while mistakenly believing that OSHA standards spare their hearing because reference level is coincidentally specified in line with OSHA 75dBA. Natural sound levels in pre-industrial environments have nothing like 75dBA for 8 hours per day, and the program content AVphiles listen to also varies wildly in its actual average level, with live concerts and action movies being among the loudest and most compressed. What passes for 'natural' age-related hearing loss is tested by audiologists against the same industry-geared OSHA standard and does not include testing of frequencies beyond Plain Old System bandwidth that is again informed by the minimal standard of speech intelligibility. Professional musicians are notoriously deaf after decades in the business. OSHA noise standard is a prime misapplication of government regulation to AVphile environments.

Personally speaking, I don't know what is causing my shortness of breath. Maybe prolonged exposure to contaminants from my lifetime of casual electrical assembly/repair, construction including minor asbestos exposure, also gypsum, fiberglass, and rockwool, and my more recent exposure to fiberglass and polyester fibers from acoustic treatments is a factor, although I don't perceive any of those exposures to be extreme or prolonged for years at a time. Maybe there's some scarring of my heart and lungs from a suspected bout of undiagnosed and largely asymptomatic coronavirus last spring. Maybe the file server and desktop computers are liberating PFAS or other flame reetardants into my living space (sorry, the profanity filter won't let me spell that word correctly lol). Possibly there's some effect from prolonged cannabis use for chronic pain, opioids before that, and seizure/antidepressant/nsaid medications before that. Perhaps there's some as-yet unknown effect from the Botox injections and novel migraine medications I'm using to suppress the tension headaches resulting from advanced arthritic degeneration and stenosis in my cervical spine. Maybe my middle-aged spread is a factor even though I'm not morbidly obese. The fact is I don't have a clue why I'm having breathing problems after so many exposures, and so far I haven't had a recent x-ray to find out, partially because of the stress of maintaining a household in this condition, but also partially because at nearly 60 years of age my quality of life has deteriorated to a point where I care less and less to understand what's really wrong. I won't last much longer anyway and there's little to be done, with likely further decline awaiting regardless of how much additional energy I put into maintaining my already damaged body.

The best advice is caution in the face of unknowns. Those who benefit the most from caution while being least likely to use it are the headstrong youth who think they will live forever and always be as vigorous as they are today. It's an illusion, and they will be disillusioned eventually. Best to keep that in mind when trading off ultra high frequency absorption against potential breathing problems later in life.

I'd ensure that all fibers in my living space are completely contained by very thin plastic bags, or at least high thread count pillow skins if it's polyethylene bass absorption (that's what I'm using currently -- cheap pillows that are low density and more likely to work at low frequency, stuffed into plastic crates that are lined with black paper and stacked).

Don't worry, if you keep pounding your ears regularly with deafening SPL, eventually you won't be able to hear that high frequency reflectivity anyway even if it somehow doesn't get lost in the treble absorption of a heavily treated room, but you will definitely notice it when a single flight of stairs has you winded.

I noted several questionable assertions in this thread.Personally speaking, I don't know what is causing my shortness of breath. Maybe prolonged exposure to contaminants from my lifetime of casual electrical assembly/repair, construction including minor asbestos exposure, also gypsum, fiberglass, and rockwool, and my more recent exposure to fiberglass and polyester fibers from acoustic treatments is a factor, although I don't perceive any of those exposures to be extreme or prolonged for years at a time. Maybe there's some scarring of my heart and lungs from a suspected bout of undiagnosed and largely asymptomatic coronavirus last spring. Maybe the file server and desktop computers are liberating PFAS or other flame reetardants into my living space (sorry, the profanity filter won't let me spell that word correctly lol). Possibly there's some effect from prolonged cannabis use for chronic pain, opioids before that, and seizure/antidepressant/nsaid medications before that. Perhaps there's some as-yet unknown effect from the Botox injections and novel migraine medications I'm using to suppress the tension headaches resulting from advanced arthritic degeneration and stenosis in my cervical spine. Maybe my middle-aged spread is a factor even though I'm not morbidly obese. The fact is I don't have a clue why I'm having breathing problems after so many exposures, and so far I haven't had a recent x-ray to find out, partially because of the stress of maintaining a household in this condition, but also partially because at nearly 60 years of age my quality of life has deteriorated to a point where I care less and less to understand what's really wrong. I won't last much longer anyway and there's little to be done, with likely further decline awaiting regardless of how much additional energy I put into maintaining my already damaged body.The best advice is caution in the face of unknowns. Those who benefit the most from caution while being least likely to use it are the headstrong youth who think they will live forever and always be as vigorous as they are today. It's an illusion, and they will be disillusioned eventually. Best to keep that in mind when trading off ultra high frequency absorption against potential breathing problems later in life.I'd ensure that all fibers in my living space are completely contained by very thin plastic bags, or at least high thread count pillow skins if it's polyethylene bass absorption (that's what I'm using currently -- cheap pillows that are low density and more likely to work at low frequency, stuffed into plastic crates that are lined with black paper and stacked).Don't worry, if you keep pounding your ears regularly with deafening SPL, eventually you won't be able to hear that high frequency reflectivity anyway even if it somehow doesn't get lost in the treble absorption of a heavily treated room, but you will definitely notice it when a single flight of stairs has you winded.

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