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Hazardous substance exposure threshold
The threshold limit value (TLV) is a level of occupational exposure to a hazardous substance where it is believed that nearly all healthy workers can
Threshold_limit_value
Adverse effects of a substance that result either from a single exposure
adverse health effects. Short-Term Exposure Limit, STEL or Threshold limit value-short-term exposure limit, TLV-STEL: The concentration which no person
Acute_toxicity
Chemical compound
the less toxic n-butyl and octyl cyanoacrylates. In the U.S., the threshold limit value for ECA is 0.2 ppm. It is a strong irritant to the lungs and eyes
Ethyl_cyanoacrylate
Industrial Hygienists publishes a more extensive list of STELs as threshold limit values (TLV-STEL). United Kingdom COSHH (Control of Substances Hazardous
Short-term_exposure_limit
Measured values that are relatively normal for a particular medical test
Values within the reference range (WRR) are those within normal limits (WNL). The limits are called the upper reference limit (URL) or upper limit of
Reference_range
Topics referred to by the same term
BVB stock exchange symbol Threshold limit value for a chemical substance TLV mirror, Han dynasty, China Type–length–value, data communications encoding
TLV
Chemical compound
contact with the eyes can lead to severe irritation or burns. Typical threshold limit value is 0.15 mg/m3. The naturally occurring mineral anglesite, PbSO4
Lead(II)_sulfate
Chemical compound (C6H12O)
it is photochemically inactive; however it has a very low safe threshold limit value. 2-Hexanone is absorbed through the lungs, orally and dermally and
2-Hexanone
Workplace environmental standard
limit Respirator assigned protection factors STEL Threshold limit value published by ACGIH Occupational exposure banding "Permissible Exposure Limits
Permissible_exposure_limit
Chemical group (–N=C=O)
a non-government organization that publishes guidance known as threshold limit values (TLV) for chemicals based research as constant work exposure level
Isocyanate
Amount of a chemical contaminant that is safe
allowable limits for chemicals, rather than scientific measures. The threshold limit value (TLV) of a chemical substance is a level to which it is believed
Tolerable_daily_intake
Medical condition
illness resulting from the effects of exposure to chlorine beyond the threshold limit value. Acute chlorine gas poisoning primarily affects the respiratory
Chlorine_gas_poisoning
Chemical compound
P391, P403+P233, P405, P422, P501 NFPA 704 (fire diamond) 4 4 2 Threshold limit value (TLV) 0.1 mg/m3 Except where otherwise noted, data are given for
White_phosphorus
and health professionals in working with small business concerns. Threshold Limit Values for Chemicals Substances Committee Mission - To recommend airborne
American Conference of Governmental Industrial Hygienists
American_Conference_of_Governmental_Industrial_Hygienists
Topics referred to by the same term
threshold Renal threshold Seizure threshold Sensory threshold Threshold expression Threshold limit value Threshold model Threshold of pain Threshold potential
Threshold
Chemical compound
standing on the WHO List of IARC Group 1 carcinogens, with a current threshold limit value of 0.01 ppm in the industrial atmosphere. Animal studies have resulted
4,4'-Methylenebis(2-chloroaniline)
4,4'-Methylenebis(2-chloroaniline)
Removal of asbestos from structures
Hygienists (ACGIH) have designated a permissible exposure limit and Threshold Limit Value, respectively, of 0.1 fiber per cubic centimeter (f/cc) on
Asbestos_abatement
Simplest secondary alcohol
Autoignition temperature 399 °C (750 °F; 672 K) Explosive limits 2–12.7% Threshold limit value (TLV) 980 mg/m3 (TWA), 1225 mg/m3 (STEL) Lethal dose or concentration
Isopropyl_alcohol
Toxic gaseous compound (COCl2)
rotten banana peels. The odor detection threshold for phosgene is 0.4 ppm, four times the threshold limit value (time weighted average). Its high toxicity
Phosgene
Type of mathematical model
statistical modeling a threshold model is any model where a threshold value, or set of threshold values, is used to distinguish ranges of values where the behaviour
Threshold_model
Lowest quantity observable with sufficient confidence above the background
g. 3.2 being the most accepted value for this arbitrary value). Another consideration that affects the detection limit is the adequacy and the accuracy
Detection_limit
Chemical compound
(338 °F; 443 K) Threshold limit value (TLV) 0.02 mg/m3, 0.01 mg/m3 (TWA), 0.03 mg/m3 (skin, 15 minute) (STEL) NIOSH (US health exposure limits): PEL (Permissible)
Mercury(II)_fulminate
Chemical compound
P405, P501 NFPA 704 (fire diamond) 4 0 1 Flash point Non-flammable Threshold limit value (TLV) 5 mg/m3 (TWA), 5 mg/m3 (skin) (C) Lethal dose or concentration
Potassium_cyanide
Mixture of alkanes from oil
Autoignition temperature 246.11 °C (475.00 °F; 519.26 K) Explosive limits 1.4–5.9 % Threshold limit value (TLV) 300 ppm (1370 mg/m3) 8 h TWA (TWA) Lethal dose or
Petroleum_ether
Topics referred to by the same term
AIDS Council Maximum allowable concentration, a concept related to threshold limit value (TLV) Medicare Administrative Contractor, a private company contracted
Mac
Chemical compound
Autoignition temperature 445 °C (833 °F; 718 K) Explosive limits 2.2–15.2% Threshold limit value (TLV) 30 mg/m3 (TWA) Lethal dose or concentration (LD, LC):
Dimethylformamide
Point at which pain begins to be felt
level. Different values for pain threshold pressure level and pain threshold pressure are found in the literature: Absolute threshold of hearing Dolorimeter
Threshold_of_pain
Chemical compound
Autoignition temperature 312 °C (594 °F; 585 K) Explosive limits 1.2–8% Threshold limit value (TLV) 2 ppm (8 mg/m3) (TWA), 4 ppm (17 mg/m3) (STEL) Lethal
Triethylamine
Colorless flammable liquid with an ammonia-like odor
time-weighted average ACGIH Threshold Limit Value (TLV): 0.01 ppm (0.013 mg/m3) 8-hour time-weighted average The odor threshold for hydrazine is 3.7 ppm
Hydrazine
Organic compound ((CH3)2CO); simplest ketone
Autoignition temperature 465 °C (869 °F; 738 K) Explosive limits 2.5–12.8% Threshold limit value (TLV) 250 ppm (STEL), 500 ppm (C) Lethal dose or concentration
Acetone
Limit defining the weakest stimulus which can be sensed
constant in determining the threshold limit. There are three common methods used to determine sensory thresholds: Method of Limits: In the first step, the
Sensory_threshold
Measure of a substance in food or water
foods (present and/or added), as opposed to acute toxicity. The threshold limit value (TLV) of a chemical substance is a level to which it is believed
Acceptable_daily_intake
Chemical compound
E (1983). "Odor as an aid to chemical safety: Odor thresholds compared with threshold limit values and volatiles for 214 industrial chemicals in air and
Naphthalene
Medical condition
2). It usually occurs after the inhalation of the gas beyond the threshold limit value. Nitrogen dioxide is reddish-brown with a very harsh smell at high
Nitrogen_dioxide_poisoning
Satisfaction with the thermal environment
pythermalcomfort or the R package comf. ACGIH has established Action Limits and Threshold Limit Values for heat stress based upon the estimated metabolic rate of
Thermal_comfort
Common synthetic polymer
2023. L 123, p. 1. Retrieved 26 October 2026. "Lead in PVC: REACH Entry 63 Limits & 5 Deadlines (2026)". Plastic Additives. 18 October 2026. Retrieved 26
Polyvinyl_chloride
Braking Technique
Threshold braking or limit braking is a driving technique most commonly used in motor racing, and in road vehicles to slow a vehicle at the maximum rate
Threshold_braking
Topics referred to by the same term
WEEL, acronym for "Workplace Environmental Exposure Level" see Threshold limit value Allan Weel Simonsen – Danish racing driver (1978–2013)Pages displaying
WEEL
Chemical compound and chemical warfare nerve agent
28 mg/m3 value is for general population). This number represents the estimated lethal concentration for 50% of exposed victims, the LCt50 value. The LCt95
Sarin
Aromatic hydrocarbon
original on February 25, 2015. Retrieved April 13, 2015. "EU sets 0.1% limit on use of toluene, TCB". ICIS. Reed Business Information. September 24,
Toluene
Chemical compound
reactions like the Skraup quinoline synthesis. Nitrobenzene is toxic (Threshold Limit Value 5 mg/m3) and readily absorbed through the skin. Prolonged exposure
Nitrobenzene
Chemical compound
P337+P313, P370+P378, P405, P501 NFPA 704 (fire diamond) 2 0 0 OX Threshold limit value (TLV) 0.01 mg/m3 (as Iodine) (TWA) Related compounds Other anions
Potassium_iodate
Chemical compound
P284, P305+P351+P338, P405, P501 NFPA 704 (fire diamond) 2 1 2 OX Threshold limit value (TLV) Airborne: 0.1 mg/m3 (TWA) Lethal dose or concentration (LD
Ammonium_persulfate
Chemical compound
(72 °F; 295 K) Autoignition temperature 370 °C (698 °F; 643 K) Threshold limit value (TLV) 150 ppm (TWA), 200 ppm (STEL) Lethal dose or concentration
Butyl_acetate
Function of the observed sample results
hypothesis H 0 {\displaystyle H_{0}} is rejected if the p-value is less than a predefined threshold value α {\displaystyle \alpha } , which is referred to as
P-value
level of 1 mg/m3 total dust. The ACGIH has recommended a 0.5 mg/m3 Threshold Limit Value for western red cedar based on its asthma effects. Certain species
Health_impacts_of_sawdust
Chemical compound (C7H16)
Autoignition temperature 215 °C (419 °F; 488 K) Explosive limits 1.05%–6.7% Threshold limit value (TLV) 200 ppm (TWA), 400 ppm (STEL) Lethal dose or concentration
Heptane
Toxic effects of carbon monoxide
fatigue, trouble with memory, and movement problems. According to the Threshold Limit Value – Time Weighted Average, humans tolerate 25 mL of CO/m3 for 8 hours/day
Carbon_monoxide_poisoning
Chemical compound
isocyanate is extremely toxic. There is no known antidote. The threshold limit value set by the American Conference of Governmental Industrial Hygienists
Methyl_isocyanate
Chemical compound
Chemistry. 2008 TLVs and BEIs: based on the documentation of the threshold limit values for chemical substances and physical agents & biological exposure
Mercuric_amidochloride
Type of fast-acting adhesive
Conference of Governmental Industrial Hygienists (ACGIH) assign a threshold limit value exposure limit of 200 parts per billion. On rare occasions, inhalation may
Cyanoacrylate
Topics referred to by the same term
Arbeitsplatz-Konzentration, a German expression corresponding to threshold limit value, which relates to safe daily exposure levels to chemical substances
MAK
Chemical element with atomic number 15 (P)
as the permissible exposure limit by the Occupational Safety and Health Administration and as the recommended exposure limit by the National Institute for
Phosphorus
Organic chemical compound
needed boost to the flat market, as of 2013. The threshold limit value is 25 ppm (STEL/ceiling value) and the MAK (Maximum Workplace Concentration) is
Acetaldehyde
Chemical compound
(500 °F; 533 K) Autoignition temperature 496 °C (925 °F; 769 K) Threshold limit value (TLV) 10 mg/m3 (STEL) Lethal dose or concentration (LD, LC): LD50
Terephthalic_acid
Chemical compound
Governmental Industrial Hygienists established a working place threshold limit value for sulfur dioxide (which is formed from bisulfite) of 2ppm averaged
Sodium_bisulfite
Chemical compound – an oxide of copper with formula Cu2O
P391, P501 NFPA 704 (fire diamond) 3 0 0 Threshold limit value (TLV) 1 mg/m3 (TWA) NIOSH (US health exposure limits): PEL (Permissible) TWA 1 mg/m3 (as Cu)
Copper(I)_oxide
Upper limit on the acceptable concentration of a hazardous substance
for Occupational Safety and Health Indicative limit value, set by the European Union Threshold limit value, set by the American Conference of Governmental
Occupational_exposure_limit
Chemical compound formerly used as a refrigerant
coma, and death. Occupational safety standards have established a threshold limit value (TLV) and a maximum allowable concentration (MAC) of 50 ppm as a
Chloromethane
Chemical compound
Precautionary statements P261, P305+P351+P338 NFPA 704 (fire diamond) 0 0 0 Threshold limit value (TLV) 5 mg/m3 (TWA) Lethal dose or concentration (LD, LC): LD50
Iron(III)_oxide
Chemical compound
average threshold limit value for an 8-hour exposure at 10 parts per million (ppm). In 2014, the ACGIH adopted a lower threshold limit value of 0.1 ppm
1-Bromopropane
Organic compound (CH2=CHCH2OH)
glutathione. It is significantly more toxic than related alcohols. Its threshold limit value (TLV) is 2 ppm. It is a lachrymator. Propargyl alcohol "#0017".
Allyl_alcohol
Chemical compound
products. It can also be prepared by other methods that are of instructional value. The reaction of sodium chloroacetate with sodium nitrite in aqueous solution
Nitromethane
Apparent temperature estimating how humans are affected
American Conference of Governmental Industrial Hygienists publishes threshold limit values (TLVs) that have been adopted by many governments for use in the
Wet-bulb_globe_temperature
Chemical compound
P210, P260, P264, P273, P280, P284 NFPA 704 (fire diamond) 4 3 2 Threshold limit value (TLV) 5 mg/m3 (TWA) Safety data sheet (SDS) Sigma Aldrich Related
Sodium_cyanoborohydride
Chemical compound
Autoignition temperature 448 °C (838 °F; 721 K) Explosive limits 1.2%–8.0% Threshold limit value (TLV) 20 ppm (TWA), 75 ppm (STEL) Lethal dose or concentration
Methyl_isobutyl_ketone
Chemical compound
than fluoroantimonic acid. The H0 value measures the protonating ability of the bulk, liquid acid, and this value has been directly determined or estimated
Fluoroantimonic_acid
Organic chemical compound
phthalate.[citation needed] Dinitrotoluenes are highly toxic with a threshold limit value (TLV) of 1.5 mg/m3. It converts hemoglobin into methemoglobin. 2
2,4-Dinitrotoluene
Chemical compound
P337+P313, P370+P378, P405, P501 NFPA 704 (fire diamond) 3 0 2 OX Threshold limit value (TLV) 0.5 mg/m3 (TWA) Lethal dose or concentration (LD, LC): LD50
Barium_nitrate
Chemical compound (H2SO4)
In the United States, the permissible exposure limit (PEL) for sulfuric acid is fixed at 1 mg/m3: limits in other countries are similar. There have been
Sulfuric_acid
Maximum stress that will not cause fatigue failure
endurance limit, the stress value below which the material will withstand many load cycles, but implies that it is similar to fatigue limit. Some authors
Fatigue_limit
Chemical compound
P264, P270, P301+P312+P330, P501 NFPA 704 (fire diamond) 2 0 0 Threshold limit value (TLV) 2.5 mg/m3 (as fluorine) (TWA) Lethal dose or concentration
Sodium_monofluorophosphate
Chemical compound
minor component of cooked potatoes. The threshold limit value (TLV) is 0.5 ppm. tert-butylthiol has an odor threshold of <0.33 ppb. Butanethiol (butyl mercaptan)
Tert-Butylthiol
Chemical compound
P330, P391, P403+P233, P405, P501 NFPA 704 (fire diamond) 3 0 0 OX Threshold limit value (TLV) 0.2 mg/m3 (TWA), 0.6 mg/m3 (STEL) Lethal dose or concentration
Uranyl_nitrate
Explosive chemical compound
contaminated with picrates, or in contact with metals that form picrates) Threshold limit value (TLV) 0.1 mg/m3 (TWA) Lethal dose or concentration (LD, LC): LDLo
Picric_acid
Chemical compound
amounts are used as a solvent. Cyclohexanol is moderately toxic: the Threshold Limit Value for the vapor for 8 h is 50 ppm. The IDLH concentration is set at
Cyclohexanol
Chemical compound (CH2)3(CHO)2
poly-glutaraldehyde and related oligomers. This reaction occurs at alkaline pH values. A number of mechanisms have been invoked to explain the biocidal and fixative
Glutaraldehyde
Organochlorine compound (C7H5ClO)
Autoignition temperature 600 °C (1,112 °F; 873 K) Explosive limits 2.5% to 27%(V) Threshold limit value (TLV) 0.5 ppm (C) Lethal dose or concentration (LD, LC):
Benzoyl_chloride
Chemical compound
Oswald, Stefan; Gasteiger, Hubert A. (2023-03-01). "The Structural Stability Limit of Layered Lithium Transition Metal Oxides Due to Oxygen Release at High
Lithium_cobalt_oxide
Chemical compound
P370+P378, P391, P403+P233, P405, P501 NFPA 704 (fire diamond) 4 0 1 OX Threshold limit value (TLV) 0.2 μg/m3 (TWA), 0.5 μg/m3 Skin (STEL) Lethal dose or concentration
Potassium_dichromate
Chemical compound
(fire diamond) 0 1 0 Autoignition temperature 250 °C (482 °F; 523 K) Threshold limit value (TLV) 3 mg/m3 (TWA) Except where otherwise noted, data are given
Calcium_stearate
Chemical compound
ingestion of more than 5 mg/d leads to nonspecific symptoms. PEL, REL, and IDLH values are based on sodium selenide, which is an order of magnitude more toxic
Selenium_dioxide
Chemical compound
at a concentration of about 1 mmol/g. The time-weighed average threshold limit value for exposure to DEAD over a typical 40-hour working week is 50 parts
Diethyl_azodicarboxylate
Chemical compound
plants polymerizing vinyl chloride, such as a reduction of the threshold limit value of monomer." Vinyl chloride was first reported to induce angiosarcoma
Vinyl_chloride
Chemical compound
P305+P351+P338+P310, P332+P313, P362, P391, P501 NFPA 704 (fire diamond) 2 0 1 Threshold limit value (TLV) 1 mg/m3 (TWA) Lethal dose or concentration (LD, LC): LD50
Copper(I)_chloride
Chemical compound
compound and far more toxic than its congener hydrogen sulfide. The threshold limit value is 0.05 ppm. The gas acts as an irritant at concentrations higher
Hydrogen_selenide
Monitoring system in computer drives
two values: "threshold not exceeded" and "threshold exceeded". Often, these are represented as "drive OK" or "drive fail" respectively. A "threshold exceeded"
Self-Monitoring, Analysis and Reporting Technology
Self-Monitoring,_Analysis_and_Reporting_Technology
Chemical compound
P362+P364, P370+P378, P391, P405, P501 NFPA 704 (fire diamond) 2 0 2 OX Threshold limit value (TLV) 0.05 mg/m3 (TWA) Lethal dose or concentration (LD, LC): LD50
Lead(II)_nitrate
Threshold of percolation theory models
and the nature of the connectivity in them. The percolation threshold is the critical value of the occupation probability p, or more generally a critical
Percolation_threshold
Chemical compound
polymerize. The peroxide catalyzes this. A table of occupational exposure limits (OELs) from various jurisdictions follows. In general, the OELs range from
Chloroprene
Chemical compound
P305+P351+P338+P310, P363, P390, P391, P405, P501 NFPA 704 (fire diamond) 3 0 0 Threshold limit value (TLV) 0.5 mg/m3 (as Ba) (TWA) Lethal dose or concentration (LD,
Barium_sulfide
time of greatest risk to workers and patrons. The ACGIH eight hour Threshold Limit Value (TLV) for sound is 85 A-weighted decibel (dBA). Exposure at or below
Occupational health and safety in the casino industry
Occupational_health_and_safety_in_the_casino_industry
Solvent used to dissolve paint
Conference of Governmental Industrial Hygienists has established threshold limit values (TLVs) for most of these compounds. The TLV is defined as the maximum
Paint_thinner
Concept in the psychophysics of vision
The flicker fusion threshold, also known as critical flicker frequency, flicker modulation threshold, or flicker fusion rate, is the frequency at which
Flicker_fusion_threshold
Complex of Fe2+ by ortho-phenanthroline
P270, P273, P301+P316, P301+P317, P321, P330, P391, P405, P501 Threshold limit value (TLV) 1.0 mg/m3, as Fe Except where otherwise noted, data are given
Ferroin
Chemical compound
C6H4(CH3)2. All xylene isomers are colorless and highly flammable. The odor threshold of p-xylene is 0.62 parts per million (ppm). The production of p-xylene
P-Xylene
Chemical compound
NO 6 FeSO4 + 3 Cl2 → 2 Fe2(SO4)3 + 2 FeCl3 Its mild reducing power is of value in organic synthesis. It is used as the iron catalyst component of Fenton's
Iron(II)_sulfate
Statistic in cost-effectiveness analysis
rule or cost-effectiveness threshold in resource allocation. If a decision-maker is able to establish a willingness-to-pay value for the outcome of interest
Incremental cost-effectiveness ratio
Incremental_cost-effectiveness_ratio
Image edge detection algorithm
value, for instance, θ in [0°, 22.5°] or [157.5°, 180°] maps to 0°. Minimum cut-off suppression of gradient magnitudes, or lower bound thresholding,
Canny_edge_detector
Chemical compound
P305+P351+P338+P310, P332+P313, P362 NFPA 704 (fire diamond) 0 1 1 Threshold limit value (TLV) 2.5 mg/m3 (skin) (TWA) Related compounds Other anions Sodium
Potassium_benzoate
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THRESHOLD LIMIT-VALUE
THRESHOLD LIMIT-VALUE
Girl/Female
Tamil
Mark, Limit
Girl/Female
Hindu
Limit
Girl/Female
Biblical
Bound, limit.
Girl/Female
Gujarati, Indian
Limit
Girl/Female
Arabic
No Limit
Girl/Female
Hindu
Mark, Limit
Girl/Female
Hindi
Limit.
Girl/Female
Tamil
Limit
Boy/Male
Arabic, Muslim
Gateway; Threshold
Boy/Male
Muslim/Islamic
Threshold
Girl/Female
Arabic, Indian, Muslim, Tamil
Limit; Border
Biblical
threshold; silver cup
Boy/Male
Muslim
Threshold
Female
Hebrew
(לִילִית) Variant spelling of Hebrew Lilith, LILIT means "of the night."
Boy/Male
Indian
Threshold
Girl/Female
Hindu, Indian, Sanskrit
Limit
Boy/Male
Arabic, Muslim
Threshold; Gateway
Boy/Male
Biblical
Threshold, silver cup.
Girl/Female
Hindu, Indian, Traditional
Limit
Girl/Female
Indian
Limit
THRESHOLD LIMIT-VALUE
THRESHOLD LIMIT-VALUE
THRESHOLD LIMIT-VALUE
THRESHOLD LIMIT-VALUE
THRESHOLD LIMIT-VALUE
THRESHOLD LIMIT-VALUE
THRESHOLD LIMIT-VALUE
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