HAP
HAZARDOUS AIR POLLUTANTS

HAE OR DOW 17
A process used to apply a chromate conversion coating to magnesium

HASL
HOT AIR SOLDER LEVELING

HARD CHROMIUM
A chromium deposit which is more than 100 uin. (2.5 um) thickness. Compared to decorative chromium, the bath usually
has a higher chromium concentration and is operated at a higher temperature and current density.

HASTELLOY
A high strength nickel-based steel alloy with excellent corrosion resistance.

HAZOP
HAZARD AND OPERABILITY

HAZWOPER
HAZARDOUS WASTE OPERATIONS AND EMERGENCY  RESPONSE REGULATIONS

HAZWRAP
HAZARDOUS WASTE REMEDIAL ACTION PROGRAM

HBN
HEALTH-BASED NUMBERS

HCFC
HYDROCHLOROFLUOROCARBONS

HCS
HAZARDOUS  COMMUNICATION STANDARD

HDPE
HIGH DENSITY POLYETHYLENE

HEPA
HIGH  EFFICIENCY PARTICULATE AIR PURIFYING  RESPIRATOR EQUIPMENT

HERL
HEALTH EFFECTS RESEARCH LABORATORY

HFC
HYDROFLUOROCARBONS

HHW
HOUSEHOLD HAZARDOUS WASTE

HIGH CARBON STEEL
Carbon steels containing 0.35% carbon or more. It has a high affinity for hydrogen and susceptible to hydrogen embrittlement.

HIP
HOT ISOSTATIC PRESSING

HISTOGRAM
A histogram is a visual representation of the spread of dispersion of variables ( continuos ) data.
In histograms of natural   data there is a tendency for many items to fall towards the center
of the distribution ( central tendency ), with progressively  fewer items as you move from the center.

HMAC
HAZARDOUS MATERIALS ADVISORY COUNCIL

HMIS
HAZARDOUS MATERIALS IDENTIFICATION SYSTEM

HMR
HAZARDOUS MATERIALS REGULATIONS

HMTA
HAZARDOUS MATERIALS TRANSPORTATION ACT

HMTUSA
HAZARDOUS MATERIALS TRANSPORTATION AND  UNIFORM SAFETY ACT

HONING
An abrasive or polishing operation which uses a fine grinding action. Frequently, the process uses a limestone medium in tumbling.

HPV
HIGH PRODUCTION  VOLUME

HRS
HAZARD RANKING SYSTEM

HSIA
HALOGENATED SOLVENTS INDUSTRY ALLIANCE

HSLA
HIGH-STRENGTH LOW-ALLOY

HSWA
HAZARDOUS AND SOLID WASTE AMENDMENTS

HULL CELL
A trapezoidal plating box with a volume of 267mL  in which 4' panel  the CATHODE (-)
is placed at 38 degrees to   a dissolving ANODE (+);  this angle creates a wide 'current density'
( ASF ) range to check the bath.

HVLP
HIGH VOLUME  LOW PRESSURE

HVOF
HIGH-VELOCITY OXYGEN FUEL

HWD
HAZARDOUS WASTE DISPOSAL

HWERL
HAZARDOUS WASTE ENGINEERING RESEARCH  LABORATORY

HWIR
HAZARDOUS WASTE IDENTIFICATION RULE

HWMF
HAZARDOUS WASTE MANAGEMENT FACILITIES

HWTC
HAZARDOUS WASTE TREATMENT COUNCIL

HYDROGEN EMBRITTLEMENT
Embrittlement of a metal caused by absorption of hydrogen during cathodic pickling, electrocleaning or plating.

HYDROPHILIC
A surface that wets with water easily.