BOLTEX PRODUCTS APPROVED BY:

ALLIED SIGNAL CORP.

AMERICAN NATURAL RESOURCES (ANR)

AMERADA HESS

AMOCO CHEMICAL

ANIOCO OIL

AMOCO PIPELINE

AQUILA SOUTHWEST PIPELINE

ARAMCO

ARCO PIPELINE

ARCO PRODUCTS CO.

ARIZONA CHEMICAL

ARKLA

BASF

BAYER CORPORATION

BORDEN CHEMICAL & PLASTICS

B.P. OIL COMPANY

B.F.G. INTERMEDIATES

CAMERON IRON WORKS

CAROLINA EASTMAN CO.

CHAPLIN REFINERY

CHEVRON

CITGO

CITY PUBLIC SERVICES

CLAJON GAS CO., L.P.

COASTAL CORPORATION

COLORADO INTERSTATE GAS (CIG)

CONOCO

COOPER INDUSTRIES

COS-MAR

DAVY McKEE DRESSER ENG. DIV.

DEGUSSA CORP.

DELHI GAS PEPELLNE

DIAMOND SHAMROCK

DOW CHEMICAL

DRESSER RAND

EASTMAN CHEMICAL CO.

EL PASO NATURAL GAS COMPANY

ENRON

ENTERPRISE PRODUCTS

ENTEX

ESSO

EXXON

FINA OIL & CHEMICAL

FLORIDA GAS TRANSMISSION

GAYLORD CONTAINER

GEORGIA GULF CORP.

GOODYEAR TIRE & RUBBER

GULF CHEMICAL

GULF INTERSTATE ENG. COMPANY

G.P.M. GAS CORP (SUB, OF PHILLIPS)

HALIBURTON SERVICES

HILL PETROLEUM

HOECHST CELANESE

HOFFMAN LAROCHE

HOUSTON PIPELINE CO.

HUDSON PRODUCTS

HUNT REFINERY

INTERNATIONAL PAPER

INTEREX

INTERPROVINCIAL PIPELINE INC. - CANADA

JOHN ZINC CO.

KNIGHT CRAWFORD

KOCH INDUSTRIES (ALL DIVISIONS)

K.P.L. GAS SERVICES

LOUISIANA INTERSTATE GAS

LYONDELL

MARATHON OIL

MELAMINE CHEMICAL

MOBIL

MONSANTO

NALCO CHEMICAL

NORTHERN NATURAL GAS

NORTHWEST PIPELINE

OKLAHOMA NATURAL GAS

OXY USA, INC

PAN ENERGY CORP.

PAXON POLYINIER

PHILLIPS PETROLEUM CO.

PHILLIPS PIPELINE

PHILBRO ENERGY U.S.A., INC,

PRIDE REFINERY

RHONE POULENC

RUBICON

SAN DIEGO GAS & ELECTRIC

SCHENECTADY CHEMICAL

SHELL OIL

SHINTECH

SINCLAIR REFINERY

SOLVAY POLYMER

SOUTHERN CALIFORNIA GAS

SOUTHERN NATURAL GAS

SOUTHWESTERN REFINERY

STAR ENTERPRISE

STERLING CHEMICAL

SUNOCO

SYNCRUDE

SYTEC

TENNECO ENERGY

TENNESSEE EASTMAN CO.

TEXACO

TEXAS EASTERN GAS TRANSMISSION

TEXAS EASTMAN

TOTAL PETROLEUM

TRANSCO GAS PIPELINE CO.

TRANSWESTERN PIPELINE CO.

TRIAD CHEMICAL

TRIDENT N.G.L.

TRUNKLLNE GAS CO.

T.D. WILLIAMSON

UNION CARBIDE

UNIROYAL CHEMICAL

UNITED GAS PIPELINE CO.

UNOCAL

VALERO PIPELINE

VALERO REFINERY

VISTA CHEMICAL

WILLIAMS NATURAL GAS

WILLIAMS PIPELINE