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Welding Electrode

NSN: 3439-00-610-1899 | Model: AWS A5.1/A5.1M

A coated or uncoated filler metal or an uncoated nonfiller material in wire or solid rod form. It is used in welding where the fusing or melting heat is supplied through the medium of an electric arc wherein the rod serves as carrier of the electric current. For a collection of welding electrodes, see welding electrode set. Excludes electrode, cutting, solid.

NSN Properties and Flags
NATO Stock Number
3439-00-610-1899
DEMIL
NO
Outside Diameter
0.125 inches
Length
14.000 inches
Current Type
Ac or dc
Physical Form
Straight
Quantity Within Each Unit Package
50.0 pounds
Weld Position For Which Designed
All positions
Polarity Characteristic
Reverse
Flux Coating Type
Shielded arc
Special Features
50 lb hermetically sealed can
Material
Steel filler
Material Specification
Mil-e-22200/1, ty mil-7018 military specification single material response filler
Unit Package Type
Can
Shape
Round
Recent Solicitations
Solicitation Return by Date Buyer Code Quantity
SPE8E519T0179 2018-10-22 PEPCF 204 CN
SPE8E515T7700 2015-06-01 PEPCF 82 CN

Pricing and Availability

Send us a request for quote using the form below. Our team will contact you with an up to date pricing and availability quote ASAP.

Qty:
Email Address:
Phone Number:
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NSN 3439-00-610-1899 Datasheet

Supply Class (FSC):
Brazing Supplies And Accessories Soldering Miscellaneous Welding
Cross Reference:
  • AWS A5.1/A5.1M
  • ATOM ARC 7018 0.125 50LB
  • HOBART 718 0.125 50LB
  • JETWELD LH-70 0.125 50LB
  • RACO 7018 0.125 50LB
  • MCKAY 7018 0.125 50LB
  • CODE-ARC 7018 0.125 50LB
  • MIL-7018 0.125 50LB
  • MIL-E-22200/1
  • AWS A5.1-91
Cage Codes:
  • American Welding Society, Inc. (CAGE 31505)
  • Esab Group, Inc., The (CAGE 84021)
  • Hobart Bros Co (CAGE 28835)
  • Lincoln Electric Holdings Inc. (CAGE 36232)
  • Central Wire Industries Ltd (CAGE 59711)
  • Hobart Bros Co (CAGE 76254)
  • Airco Welding Products (CAGE 83923)
  • Military Specifications (CAGE 81349)
Replacements:
  • 3439-00-610-1899 replaces 3439-00-482-4841
Schedule B & Trade:
  • Schedule B: 8311100000 (NAICS 333992)

    Coated electrodes of base metal, for electric arc-welding

  • SITC: 69955

    Wire, rods, electrodes, etc., of base metal or of metal carbides, flux coated for soldering, etc, ; agglomerated base metal powder for metal spraying

  • End Use: 12300

    Finished metal shapes

Identification:
HMIC

Y - Indicates information is in the hazardous materials information resource system (hmirs).

PMIC

U - Precious metal content is unknown

CRITL

- The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.

Freight Information:
  • NMFC:

    197060 - Welding bars/rods/wire

  • WCC:

    576 - Metal and metal products, nos, (less than 35 feet)

  • SHC:

    9 - Other or no special handling required (sh)

  • ADC:

    A - Shipment is not a consolidation and does not exceed 84 inches in any dimension.

  • ACC:

    B - Construction materials: includes paint and related materials, prefabricated building, wood products, metal and composition mater

  • LTL:

    W - Rating variable

  • TCC:

    Z - No special type of cargo code applicable

NSN Management Codes:
  • SOS
    Sms
  • AAC
    Z
  • Quantity per pack
    1
  • Unit of Measure
    Cn
  • Shelf Life
    N/A
  • Classification Control
    U
  • MGMT_CTL
    Sf9---v
  • Repariability

Questions & Answers:

What are the historical prices recorded for this stock number?
Historical data shows pricing from $491.02 to $818.37..
Does NSN 3439-00-610-1899 have a shelf life?
No. There is no shelf life applicable for this NSN.
What NATO entities are users of this NSN?
Department Of The Air Force, Department Of The Navy, National Aeronautics and Space Administration, and National Aeronautics and Space Administration
What is the NIIN of NSN 3439-00-610-1899?
006101899 or 00-610-1899
Does NSN 3439-00-610-1899 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 3439-00-610-1899?
Solicitation SPE8E519T0179 for qty 204 on 10/12/2018
When was this national stock number assigned to the federal catalog?
Feb 05, 1975
MSDS

Material Safety

MSDS BFHTM MIL 7018

Hazards

Routes of entry: inhalation: yes skin: no ingestion: no
reports of carcinogenicity: ntp: yes iarc: yes osha: no
health hazards acute and chronic: acute: may result in discomfort such as
dizziness,nausea,dryness or irritation of nose,throat or
eyes,tightness in chest,fever & allergic reactions. chronic: may
lead to siderosis & is believed by some investigators to affect
pulmonary function.

explanation of carcinogenicity: chromium (cr+6) is listed as
carcinogenic.

effects of overexposure: see "health hazards"

First Aid

First aid: remove to fresh air,if breathing is difficult,administer
oxygen,if breathing has stopped,apply artificial respirator; get
medical help.

Chemical Properties

Hcc: n1
appearance and odor: rods: 14 inch length; round 0.125 inch diam w/steel
filler

Reactivity

Stability indicator/materials to avoid: yes
none
stability condition to avoid: none
hazardous decomposition products: difficult to determine.Varies greatly.

Proper Disposal

Waste disposal methods: discard any product residue,disposable container
or liner in an environmentally acceptable manner.

disclaimer (provided with this information by the compiling agencies):
this information is formulated for use by elements of the department
of defense. the united states of america in no manner whatsoever,
expressly or implied, warrants this information to be accurate and
disclaims all liability for its use. any person utilizing this
document should seek competent professional advice to verify and
assume responsibility for the suitability of this information to their
particular situation.

Ingredients List

Ingred name: iron
cas: 7439-89-6
rtecs #: no4565500

ingred name: manganese (sara iii)
cas: 7439-96-5
rtecs #: oo9275000
osha pel: (c) 5 mg/m3 dust
acgih tlv: 5 mg/m3 dust 9293

ingred name: silicon
cas: 7440-21-3
rtecs #: vw0400000
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9293

ingred name: chromium (sara iii)
cas: 7440-47-3
rtecs #: gb4200000
osha pel: 1 mg/m3
acgih tlv: 0.5 mg/m3; 9192
epa rpt qty: 1 lb
dot rpt qty: 1 lb

ingred name: molybdenum
cas: 7439-98-7
rtecs #: qa4680000
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3; 9293

ingred name: calcium carbonate (marble) (limestone)
cas: 1317-65-3
rtecs #: ev9580000
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9192

ingred name: calcium fluoride
cas: 7789-75-5
rtecs #: ew1760000
osha pel: 2.5 mg/m3 (f)
acgih tlv: 2.5 mg/m3 (f); 8990

ingred name: potassium titanate
cas: 12030-97-6

ingred name: alpha-alumina (aluminum oxide) (epa lists only fibrous
forms) (sara iii)
cas: 1344-28-1
rtecs #: bd1200000
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9293

ingred name: feldspar
cas: 68476-25-5

ingred name: silica, amorphous, dust
cas: 112945-52-5
rtecs #: vv7310000
osha pel: 6 mg/m3
acgih tlv: 10 mg/m3; 8990

ingred name: titanium dioxide
cas: 13463-67-7
rtecs #: xr2275000
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9293

ingred name: potassium silicate
cas: 1312-76-1

ingred name: sodium silicate
cas: 6834-92-0
rtecs #: vv9275000
acgih tlv: 5 mg/cum

ingred name: aluminum sodium fluoride (sodium fluoaluminate or cryolite)
cas: 15096-52-3
rtecs #: wa9625000
osha pel: 2.5 mg/m3 (f)
acgih tlv: 2.5 mg/m3 (f); 8990

ingred name: magnesite
cas: 546-93-0
rtecs #: om2470000
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9192

ingred name: potassium hydroxide (sara iii)
cas: 1310-58-3
rtecs #: tt2100000
osha pel: c, 2 mg/m3
acgih tlv: c 2 mg/m3; 9192
epa rpt qty: 1000 lbs
dot rpt qty: 1000 lbs

MSDS BFHTN ATOM ARC 7018 0.125 50LB

Hazards

Routes of entry: inhalation: yes skin: no ingestion: no
reports of carcinogenicity: ntp: no iarc: no osha: no
health hazards acute and chronic: acute: inhalation of welding fumes may
cause nervous system and muscle irregularities, irritation of eyes,
nose, throat, and respiratory system, metal fume fever. Chronic:
prolonged or repeated inhala tion of fumes may cause siderosis,
fluorosis and affect lung function.

explanation of carcinogenicity: no ingredient of a concentration of 0.1%
or greater is listed as a carcinogen or suspected carcinogen.

effects of overexposure: inhalation: nausea, dizziness, dryness of nose
and throat, coughing, wheezing and shortness of breath. Eyes:
redness, tearing, blurred vision.

medical cond aggravated by exposure: none specified by manufacturer.

First Aid

First aid: inhalation: remove to fresh air. Resuscitate if needed. Eyes:
flush with plenty of water for 15 minutes. See doctor. Skin: wash
with soap and water. Ingestion: do not induce vomiting. See doctor.

Chemical Properties

Hcc: n1
solubility in water: insoluble
appearance and odor: solid rod

Reactivity

Stability indicator/materials to avoid: yes
none specified by manufacturer.

stability condition to avoid: none specified by manufacturer.

hazardous decomposition products: metal fumes, fluorides.

Proper Disposal

Waste disposal methods: dispose of in accordance with local, state and
federal regulations.

disclaimer (provided with this information by the compiling agencies):
this information is formulated for use by elements of the department
of defense. the united states of america in no manner whatsoever,
expressly or implied, warrants this information to be accurate and
disclaims all liability for its use. any person utilizing this
document should seek competent professional advice to verify and
assume responsibility for the suitability of this information to their
particular situation.

Ingredients List

Ingred name: iron oxide
cas: 1309-37-1
rtecs #: no7400000
other rec limits: none recommended
osha pel: 10 mg/m3 (fe)
acgih tlv: 5 mg/m3(fe),b2; 9293

ingred name: silicon
cas: 7440-21-3
rtecs #: vw0400000
other rec limits: none recommended
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9293

ingred name: sodium metasilicate, anhydrous
cas: 6834-92-0
rtecs #: vv9275000
other rec limits: none recommended
osha pel: 2 mg/m3 8hr
acgih tlv: c; 2 mg.M3

ingred name: calcium carbonate (marble) (limestone)
cas: 1317-65-3
rtecs #: ev9580000
other rec limits: none recommended
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9293

ingred name: titanium dioxide
cas: 13463-67-7
rtecs #: xr2275000
other rec limits: none recommended
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9293

ingred name: manganese (sara iii)
cas: 7439-96-5
rtecs #: oo9275000
other rec limits: none recommended
osha pel: (c) 5 mg/m3 dust
acgih tlv: 5 mg/m3 dust 9293

ingred name: potassium silicate
cas: 1312-76-1
other rec limits: none recommended

ingred name: calcium fluoride
cas: 7789-75-5
rtecs #: ew1760000
other rec limits: none recommended
osha pel: 2.5 mg/m3 as f
acgih tlv: 2.5 mg/m3 as f

ingred name: potassium aluminum silicate (feldspar)
cas: 68476-25-5
other rec limits: none recommended
acgih tlv: 2 mg/m3

ingred name: zirconium silicate
cas: 14940-68-2
other rec limits: none recommended
acgih tlv: 5 mg/m3

MSDS BHFZG CODE-ARC 7018 MR ELECTRODES

Hazards

Routes of entry: inhalation: yes skin: yes ingestion: no
reports of carcinogenicity: ntp: no iarc: no osha: no
health hazards acute and chronic: short term exposure to welding fumes,
gases or dust may result in discomfort such as dizziness, nausea,
fever, dryness and/or irritation of nose, throat and eyes. Skin
sensitivity may also be noted. A cute exposure from some toxic
gases maycause pulmonary edema, asphyxiation and excessive exposure
can be fatal.

effects of overexposure: exposure to welding fumes may result in
discomfort such as dizziness, nausea, fever, dryness and/or
irritation of nose, throat and eyes. Skin sensitivity may also be
noted. Watery eyes, headache, brea thing difficulty, frequent
coughing and/or chest pains may occure from acute exposure. Toxic
gases can be fatal.

medical cond aggravated by exposure: some workers may be affected by a
pre-existing condition or other occupational illness because of the
wide variation in individual susceptibilities.

First Aid

First aid: in case of electrical shock, turn off power prior to removal
from exposure area and administration of first aid. Remove from
exposure area and call for medical aid. Administer oxygen if
breathing is d ifficult. If not breathing, begin artificial
respiration. If no detectable pulse, begin external heart massage.

employ first aid techniques recommended by the american red cross.

Chemical Properties

Hcc: n1
solubility in water: insoluble.

appearance and odor: flux coating on a solid metal core wire in cut
lengths.

Reactivity

Stability indicator/materials to avoid: yes
none noted
stability condition to avoid: none noted
hazardous decomposition products: welding and cutting operation may
include oxides of the metals, chromates, fluorides, complex
metallics, and ozone.

Proper Disposal

Waste disposal methods: dispose i/a/w federal, state & local regulations
disclaimer (provided with this information by the compiling agencies):
this information is formulated for use by elements of the department
of defense. the united states of america in no manner whatsoever,
expressly or implied, warrants this information to be accurate and
disclaims all liability for its use. any person utilizing this
document should seek competent professional advice to verify and
assume responsibility for the suitability of this information to their
particular situation.

Ingredients List

Ingred name: iron
cas: 7439-89-6
rtecs #: no4565500
osha pel: 10 mg/m3(iron oxide)
acgih tlv: 5 mg/m3 (iron oxide)

ingred name: titanium dioxide
cas: 13463-67-7
rtecs #: xr2275000
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9293

ingred name: silicon
cas: 7440-21-3
rtecs #: vw0400000
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9293

ingred name: manganese (sara iii)
cas: 7439-96-5
rtecs #: oo9275000
osha pel: (c) 5 mg/m3 dust
acgih tlv: 5 mg/m3 dust 9293

ingred name: sodium silicate
cas: 1344-09-8

ingred name: calcium fluoride
cas: 7789-75-5
rtecs #: ew1760000
osha pel: 2.5 mg/m3 (f)
acgih tlv: 2.5 mg/m3 (f); 8990

ingred name: potassium titanate
cas: 12030-97-6

MSDS BNKKZ 718 WELDING ELECTRODE 0.125

Hazards

Routes of entry: inhalation: yes skin: yes ingestion: no
reports of carcinogenicity: ntp: no iarc: no osha: no
health hazards acute and chronic: inhalation: discomfort, dizziness,
nausea, dryness, nose/throat irritation, pulmonary edema
bronchitis, siderosis, affect pulmonary functions. Manganese:
affects central nervous system/muscle weakness , tremors such as
parkison's disease, behavioral/handwriting changes. Eyes/skin:
irritation & burns.

explanation of carcinogenicity: none
effects of overexposure: inhalation: discomfort, dizziness, nausea,
dryness, nose/throat irritation, pulmonary edema bronchitis,
siderosis, affect pulmonary functions. Manganese: central nervous
system/muscle weakness, tremor s such as parkinson's disease,
behavioral/handwriting changes. Eyes/skin: irritation & burns.

First Aid

First aid: call for medical aid. Employ first aid techniques recommended
by the american red cross. Skin/eye: if irritation or flash burns
develop after exposure, consult physician. Wash w/water to remove
dusts. inhalation: remove from overexposure/apply artificial
respiration, if needed.

Chemical Properties

Appearance and odor: 0.125" o.D., 14" long straight rod, 50 lb pkg

Reactivity

Stability indicator/materials to avoid: yes
hazardous decomposition products: co, co2, ozone, nitrogen oxides,
oxides of iron, manganese, silicon, titanium, sodium, potassium &
fluorides.

Proper Disposal

Waste disposal methods: prevent waste from contamination surrounding
environment. Discard any product, residue, disposable container or
liner in an environmentally acceptable manner, in full compliance
w/federal, state & loc al regulations.

disclaimer (provided with this information by the compiling agencies):
this information is formulated for use by elements of the department
of defense. the united states of america in no manner whatsoever,
expressly or implied, warrants this information to be accurate and
disclaims all liability for its use. any person utilizing this
document should seek competent professional advice to verify and
assume responsibility for the suitability of this information to their
particular situation.

Ingredients List

Ingred name: iron
cas: 7439-89-6
rtecs #: no4565500
fraction by wt: 70-90%

ingred name: manganese, mn compounds
cas: 7439-96-5
rtecs #: oo9275000
fraction by wt:
osha pel: (c) 5 mg/m3 dust
acgih tlv: 5 mg/m3 dust 9293

ingred name: titanium dioxide, titanium(iv) oxide, tio2
cas: 13463-67-7
rtecs #: xr2275000
fraction by wt:
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9293

ingred name: calcium fluoride, fluorspar, calcium difluoride, irtran 3,
liparite
cas: 7789-75-5
rtecs #: ew1760000
fraction by wt: 1-8%
other rec limits: 2.5 mg/cum (as f)
osha pel: 2.5 mg/cum (as f)
acgih tlv: 2.5 mg/cum (as f)

ingred name: potassium silicate, potassium metasilicate
*92/1*
cas: 1312-76-1
fraction by wt: 2-6%

ingred name: silicate binders (sodium silicate)
*92/1*
cas: 1344-09-8
fraction by wt: 1-4%
acgih tlv: 10 mg/cum

MSDS CGMVV SHIELDED METAL ARC WELD(SMAW)(C STEEL;LOW HC STEEL;LOW (SUP)

Hazards

Ld50 lc50 mixture: none specified by manufacturer.

routes of entry: inhalation: yes skin: yes ingestion: no
reports of carcinogenicity: ntp: yes iarc: yes osha: no
health hazards acute and chronic: weld consummables as shipped are
nonreactive,nonflamm,nonexplo,technically nonhaz til
welded.Electric arc weld may create one/more of: arc rays can injure
eye,burn skin;electric shock can kill;fume/gas can be dangerous to
health.

explanation of carcinogenicity: per msds: ni,cr,welding fumes.California
prop 65.

effects of overexposure: discomft,dizz,nauu,dryness,irrit
nose/throat/eyes/resp sys/eye/skin.Metal fume fever.Skin/eye
burns,pulm edema,bronchitis.Lung dmg,asthma-like sympt,severe
injury/death,ulcers,allergic rx,tightness of chest,fever,lung
fibrosis,siderosis,cns effects,emphysema,derm,pneumonia,bone
erosion,wt loss/appetite,diff breath.

medical cond aggravated by exposure: persons w/pre-exiting impaired lung
functions(ashtma-like conditions).

First Aid

First aid: call for med aid.Employ first aid technicques recommended by
the american red cross.Eye/skin: if irrit or flash burns develop
after exposure consult physician.

Chemical Properties

Hcc: n1
boiling pt: b.P. Text: np
melt/freeze pt: m.P/f.P text: np
decomp temp: decomp text: np
vapor pres: np
vapor density: np
spec gravity: np
ph: np
viscosity: np
evaporation rate & reference: np
solubility in water: np
appearance and odor: np
percent volatiles by volume: np
corrosion rate: np

Reactivity

None specified by manufacturer.

stability condition to avoid: none specified by manufacturer.

hazardous decomposition products: weld fume/gas cant be classified
simply.Compo/quant depend upon metal
weld,process,procedures,electrode.Complex (supple)

Proper Disposal

Waste disposal methods: prevent frm contam surrounding enviro.Discard
any pro/residue/dispo cntnr/liner in enviro acceptable manner in
full compliance w/fed/state/loc regs.

disclaimer (provided with this information by the compiling agencies):
this information is formulated for use by elements of the department
of defense. the united states of america in no manner whatsoever,
expressly or implied, warrants this information to be accurate and
disclaims all liability for its use. any person utilizing this
document should seek competent professional advice to verify and
assume responsibility for the suitability of this information to their
particular situation.

Ingredients List

Ingred name: iron, group a=70-90%,group b=60-80%,group c=68-90%.

cas: 7439-89-6
rtecs #: no4565500
fraction by wt: see ing
other rec limits: none recommended

ingred name: manganese (sara 313)
cas: 7439-96-5
rtecs #: oo9275000
fraction by wt: 1-5%
other rec limits: none recommended
osha pel: c, 5 mg/m3 (fume)
acgih tlv: 0.2 mg/m3; 9596

ingred name: alpha-alumina (aluminum oxide) (sara 313) (in only group a)
cas: 1344-28-1
rtecs #: bd1200000
fraction by wt:
other rec limits: none recommended
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9596

ingred name: calcium carbonate (marble) (limestone), group b=3-10%,
group c=5-10%
cas: 1317-65-3
rtecs #: ev9580000
fraction by wt: see ing
other rec limits: none recommended
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9596

ingred name: cellulose (paper fiber), group a=
cas: 9004-34-6
rtecs #: fj5691460
fraction by wt: see ing
other rec limits: none recommended
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3; 9596

ingred name: mica, in group a only
cas: 12001-26-2
rtecs #: vv8760000
fraction by wt:
other rec limits: none recommended
osha pel: 20 mppcf; z-3
acgih tlv: 3 mg/m3 rdust; 9596

ingred name: silica, crystalline - quartz
cas: 14808-60-7
rtecs #: vv7330000
fraction by wt:
other rec limits: none recommended
osha pel: see table z-3
acgih tlv: 0.1 mg/m3 rdust;9596

ingred name: silicon in group b only
cas: 7440-21-3
rtecs #: vw0400000
fraction by wt:
other rec limits: none recommended
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9596

ingred name: titanium dioxide, group a & b.

cas: 13463-67-7
rtecs #: xr2275000
fraction by wt:
other rec limits: none recommended
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9596

ingred name: calcium fluoride (as f), group b=1-12%, group c=5-15%.

cas: 7789-75-5
rtecs #: ew1760000
fraction by wt: see ing
other rec limits: none recommended

ingred name: chromium (sara 313) (cercla) in group c only
cas: 7440-47-3
rtecs #: gb4200000
fraction by wt:
other rec limits: none recommended
osha pel: 1 mg/m3
acgih tlv: 0.5 mg/m3; 9596
epa rpt qty: 1 lb
dot rpt qty: 1 lb

ingred name: nickel (sara 313) (cercla), only in group c
cas: 7440-02-0
rtecs #: qr5950000
fraction by wt: 1-5%
other rec limits: none recommended
osha pel: 1 mg/m3
acgih tlv: 1 mg/m3; 9596

ingred name: molybdenum only in group c
cas: 7439-98-7
rtecs #: qa4680000
fraction by wt:
other rec limits: none recommended
osha pel: 10 ppm.

acgih tlv: 10 ppm.


ingred name: magnesite, group a=
cas: 546-93-0
rtecs #: om2470000
fraction by wt: see ing
other rec limits: none recommended
osha pel: 15 mg/m3 tdust
acgih tlv: 10 mg/m3 tdust; 9596

ingred name: silicate binders
fraction by wt:
other rec limits: none recommended