pete   1099

« earlier    

Identifying Unknown Plastics
"This is a piece of free-burning ABS tubing showing characteristic flame color and smoke. The burn test, as it’s known, correlates a plastic sample’s composition with a set of observable properties including…

whether or not the material will freely burn in air when a gas ignition flame is removed,
the color of the flame,
the smell,
the presence or absence of molten drips, and
the color and properties of any smoke, esp. the reactivity of smoke with wet litmus paper.
Though useful, the burn test should be used with caution of the toxicity of many plastic combustion products, and need not be a first resort when confronted with a sample of unknown polymer.

To risk stating the obvious, the first step in identifying a piece of plastic should be to look for a label. Since 1988, the SPI resin identification coding system (Wikipedia) has been widely adopted by plastics manufacturers to label their products for post-consumer recycling. Though the variety of possible plastic materials is essentially infinite, the familiar SPI recycling codes are a useful basic taxonomy of the polymers one is likely to encounter “in the wild.”

SPI # Abbreviation Name Example Use Density (g/mL)
1 PETE/PET Polyethylene terephthalate Water bottles 1.37-1.45
2 HDPE High-density polyethylene Milk jugs 0.93-0.97
3 PVC Polyvinyl Chloride Pipe 1.3-1.45
4 LDPE Low-density polyethylene Saran wrap 0.91-0.94
5 PP Polypropylene Food containers 0.85-0.94
6 PS Polystyrene Model kits 1.05
9 ABS Acrylonitrile butadiene styrene Lego bricks 1.04
Assuming your sample has no label that would indicate its composition, then, the test which offers the best combination of safety, utility, and convenience is probably density. If your sample is made of a single material, solid through and through, its density can be checked against a set of reference liquids of known densities by simply dropping the sample in a small vial of each liquid: If it floats, it is less dense than the reference, and if it sinks, it is more dense than the reference. Polyethylenes and polypropylenes float in water (density = 1 g/mL), for instance, while most other plastics sink. Among heavier-than-water plastics, ABS and PS will float in glycerin (density = 1.26 g/mL), but PETE and PVC do not.

Other useful tests for discriminating plastics are the Beilstein copper wire test (which indicates the presence of chlorine, e.g. in PVC), susceptibility to acetone (most plastics besides polyethylene and polypropylene will become “tacky” on exposure), and whether the plastic turns white under stress, e.g. when bent (PVC whitens; PET does not)."
plastic  identify  unknown  flame  toxic  test  burn  polymer  label  SPI  PETE  PET  HDPE  PVC  LDPE  PP  PS  ABS 
4 weeks ago by cosmic
Opinion | Why You Love Mayor Pete - The New York Times
The Buttigieg surge suggests that there are a lot of Democrats who want to say goodbye to all that. They don’t want to fight fire and divisiveness with more fire and divisiveness. They don’t want to fight white identity politics with another kind of identity politics.

...

They are sick of the moral melodrama altogether. They just want a person who is more about governing than virtue-signaling, more about friendliness and basic decency than media circus and rhetorical war.
PeteButtigieg  pete  Buttigieg  why  love  mayor 
10 weeks ago by bekishore
In defence of British Food | Jonathan Meades
From pork pies with mushy peas to the full English fry up … a sentimental celebration of a nation’s traditional grub.
27th  march  2019  guardian  jonathan  meades  pete  brown  book  review  cooking 
11 weeks ago by pnjman

« earlier    

related tags

#  #54  #55  #56  #61  'always'  'big  'breakfast  'butthole  'does  'genuinely  'health'  'i’m  'no  'not  'run'  'shot  'snl'  "ghostin"  "gigawatts  "loco"  "thank  -  101  2006  2019  2019:  2020  27th  3  32  36:  3rd  4th  5  80s  9  a  about  abs  abuse  according  actionable  added  addressed  adolescence'  advice:  after  against  again”  aguilar  aitken  algorithms  all  america's  americans’  anaction  and  anyone  apatow-directed  apologize  apology  ariana  assures  at  babylon  bad  be  beckinsale's  beckinsale  beckinsale’s  become  before  belong  bend  best  biasing  big  bill  birthday  black  blackfaced  blast  blocked  blog  book  branding  braun  break  broken  brother?'  brown  bullsh*t’  burn  burns  bus  buttigieg  c.k.  calls  campaign  can  candidate's  case  catholic  cd  celebrated  chalamet  change  chapman  chart  chase  chevy  church  class  cleveland  colin  comedy  comments  compares  comparing  compliment  concert  configurations  congressman  controller  controversial  cooking  cover  crenshaw  critics  crowded  cudi  custom  dan  davidson's  davidson  davidson:  davidson’s  davison  death  declined  defends  democratic  democrats  design  diagnostic  didn’t  diocese  does  doing  down  dr.  dramatic  drone  drummond  during  dutch  eating  economics  election  electronics  elusive  emotion  end  engagement  erp  everyday  ex-fiancé  ex  explains  explanation  eyes'  f*cking  face'  fan  fans  fans:  fastcompany  field  first  flame  flight  for  forgives  founder  frames  from  fuck  fun  funny  future  game  gap  gave  gay  germany  get  gets  getting  gives  globes  gofundme  golden  gop  got  grande's  grande?  grande  guard  guardian  guide  guitar  gun  hack  had  hands  hard  harvard  has  have  hdpe  he  health  hearts  heat  heckler  helper.  her  here  here’s  him  his  holding  holmes  hopefuls  hot  how  howto  i  identify  ii"  improv  imu  in  inertial  infographic  injury  instagram  internet  is  it's  its  jam  joke  jokes  jonathan  journalism  judd  jurley  k  kanye  kate  keep  kelly's  kelly  kelly:  kemper  kenan  kicks  kid  kids  kill  kim  klf  label  labscope  last  lau  law  ldpe  left  lesson  let  linux  lipman  lock  logo  loop  louis  love  mac  machine  make  makes  making  man:  march  married  matching  matt  matter  mayor  me  meades  meier  mel  meme  mental  meyers  meyers;  miller  minaj  minutes  mobilegeddon  mom  monopoly  more?  moz’s  multilingual  music  my  myself.  navigation  neck  new  next"  next’  nicki  nixes  no  not  notch  obd2  obdii  of  olson  on  oneplus  ones  openly  or  others  out  over  page  pain  paper  party  patch  pda  penis  perception  perfect  person'  pet  petebuttigieg  peterl  phase  philly  pic  pig  planned  plastic  pokes  policy  polymer  pops  post-trump  pp  praise  premiere  premiere:  president  presidential  pro-trump  profile  ps  pscyhology  pt100  ptsd  public  put  pvc  questions  r.  racist  rangers-capitals  rant  rant:  rapper  reach  recalls  receiving  recorded  relationship  release  renewed  rep.  reportedly  research  responds  return  returns  review  rife  rig  ring  rips  rise  rod  rumored  santa's  saw  say  says  scandal  scare  scooter  see  seemingly  seems  sent  seo  sessions  set  sexual  shade  she  should  show  sides  silly  skit  smoking  snl  snl’s  soanes  sociology  someone  song  sour  south  southwest  sparkfun  sparring  spi  spicy  split  spotted  star  stardom  stay  stock  suhr  suicide  sundance  supplychain  support  survival  taken  talks  tattoo  tattoos  techniques  technology  tells  test  that  the  think  this  thompson  thorn  threat  threw  tide  tiffany's'  time  timothée  tips  to  towards  toxic  trans  transcripts  transistor  tries  turn  turning  tutorial  twitter  u.s.  u  unknown  up'  up  urges  values  versions  veteran  video  vigour  visualisation  wants  war  waterman  wedding  weed  week's  were  west  west’s  what  when  while  who  why  will  wings  wipes  wisdom  wishes  with  won't'  words  works  world  writing  yet  you'  youtube  |  ‘snl’  ‘stop  ‘thank  ‘war  “burdenless”  “homeless”  “make 

Copy this bookmark:



description:


tags: