*sigh* although familiarity can be a righteous bitch, firm scientific facts do not lie, man! Before we full-on faceplant ourselves into the pros and cons of each particular extractor material, it's important to understand a lil' science term called "chemical compatibility". It sounds imposing, I know, but bear with me for a minute and I swear it'll all make perfect sense! Generally speaking, chemical compatibility is the scientific measurement of a substance's stability when its combined with another substance; be it a material or a chemical. Depending on the lack of a reaction or the severity of the reaction, a letter-grade rating system was implemented for easily identifying the inherent safety or dangers of combining two types of materials or chemicals.
For the diehards, you can easily access the online Chemical Compatibility Database to further research the resistance ratings of just about any material/chemical combination under the sun. For you laymans out there, just think of the CCD as a quick list of reference that helps prevent you from immediately killing yourself and anyone else downwind from you! Here's a breakdown of the CCD's rating system: A = Excellent. B = Good -- Minor effect, slight corrosion or discolouration. C = Fair -- Moderate effect, not recommended for continuous use. D = Severe Effect -- N ot recommended for ANY use whatsoever. Asides from all of the personal reasons a person may want to stick to glass, metal or PVC, here is what the compatibility database has to say about combining each proposed material with basic n -Butane: PVC + n -Butane = C 1 -Fair Glass + n -Butane = A-Excellent (glass is chemically innate, so it gets an automatic A!) Stainless Steel 304 + n -Butane = A 2 -Excellent.
Now that we've got the straight-up scientific facts/grades out on the table, let's go over each in a bit of a finer detail - just to help summarize each material in a more conclusive sense for you. Polyvinyl Chloride) Relatively a cheaper alternative to glass- and metal-based extractors. Doesn't get nearly as cold as its glass and metal counterparts. Standard PVC extractors have a screw lid that helps prevent blow-outs. Due to it's low chemical resistance rating, it's inner structure is prone to weakening. Prolonged use of the same PVC tube can result in leeching contaminants into your product. The screw lid that most PVC extractors have feature few holes for material to pass through; this can potentially hamper your yield. Borosilicate Glass) Glass tubes are 100% chemically innate. This means that there is ZERO chance of any pollutants contaminating your extracted material. Some glass tubes can have what's called a s wivel top; a spiralled opening at the entry point that manipulates butane to enter the tube as an even spray, rather than a pressurized jet. This can help maximize your contacting surface area which can give you a better yield. Depending on the tube's quality (or lack therein), it may become susceptible to extreme temperature fluctuation. This can potentially lead to the tube shattering if handled too roughly. A higher quality glass extractor will always cost more than a cheaply made one. Most glass tubes have a wide opening at the bottom with a wide lip. This can make it trickier to securely fasten whatever kind of filter you're using. 304 Stainless Steel) Very good quality metal extractors are typically made from 304 stainless steel (though aluminium extraction tubes DO exist and also have an excellent A-rating). This particular steel grade boasts high chemical resistance and is not electrically/thermally conductive; all of which combine for a very stable extraction tube. Virtually indestructible and by far the longest lasting material out of the three. Because high-quality steel extraction tubes are cut from a solid block of 304 stainless steel, they are the most expensive option. Like glass, metal extractors can get quite cold during prolonged runs. Top of the line metal extractors come with special clamps for the top and bottom openings; these can be a bit of a groaner if lost or misplaced. As you can plainly see, there's clearly a lot of reasons to justify going with one extractor over the others; whether it's a matter of cost or quality. Ultimately, that final decision will be yours to make and I can only help light the way for you! In order for you to make the best choice for your personal needs and wants, do your homework, assess how serious your extraction needs are, ask yourself if this is something you'll practice long-term and be willing to save up your money if need be.
Remember: an exceptional extractor might cost you more now, but you might just save yourself from future headaches that a cheaper unit will bring along with it. ABLAZE Stainless Steel 1 Pound 450 Gram Extractor Extraction Tube (Dewax Sleeve) Share this: Capacity:450 Gram Tube With Dewax Sleeve. Dual Purpose for both OPENBLAST and CLOSED COLUMN PRESSURIZED.
Extra Viton Sanitary Gasket w/ Stainless Screen (150 Micron) Larger Platinum Laboratory-Grade Silicone Mat. Vacuum clamps at all interfaces make for a high pressure, easy clean unit. ABLAZE Closed Column / Open Blast Extractor 90 Gram with TriPod. ABLAZE Closed Column / Open Blast Extractor 90 Gram with TriPod. 90 Gram Capacity Perfect For Small Run Dual Purpose for both OPEN BLAST and CLOSED COLUMN Extra Viton Sanitary Gasket w/ Stainless Screen (150 Micron) Larger Platinum Laboratory-Grade Silicone Mat Vacuum clamps at all interfaces make for a high pressure, easy clean unit.