AF

Asbestos-free gasket material

Gaskets

EPDM

Ethylene Propylene Diene M-class rubber, elastomer

Gaskets, O-rings, diaphragms

FPM or FKM

Fluorine Polymer M-class rubber, elastomer, brand name: Viton

Gaskets, O-rings, radial shaft seals, diaphragms

CSM

Chlorosulfonated Polyethylene, elastomer

Gaskets, shaped items

NBR

Acrylonitrile Butadiene Rubber, elastomer

O-rings, gaskets

Hastelloy

Nickel-based alloy

IXEF

Polyarylamide, plastic

Monel

Nickel-copper alloy (about 65% Ni, 33% Cu, 2% Fe), very solid

PE

Polyethylene

Chemical tank

PP

Polypropylene, plastic

Housing parts, pipes

PTFE

Polytetrafluoroethylene, plastic, also called Teflon

Housing parts, diaphragm, gaskets

PVC

Polyvinyl chloride, plastic

Housing parts, pipes

PVDF

Polyvinylidene fluoride, plastic

Housing parts, pipes

PMMA

Polymethyl methacrylate, plexiglass

Housing parts

BSW

British Standard Whitworth screw thread

The screw thread most commonly used in England

BSP

British Standard Pipe

Pipe thread for connections not sealed in the thread

BSPT

Tapered Whitworth pipe thread DIN 2999

Threaded pipes and fittings

NPT

American pipe thread (tapered)

Self-sealing connections

W 1“

BSW thread 1 inch = 25.4 mm 

Pipe lines

G5/8 a

External thread R5/8

Threaded pipes and fittings

G3/4 i

Internal thread Rp3/4

Threaded pipes and fittings

M 10

Metric ISO thread M 10

Screws, fixings, general application

DN10

Nominal width 10

Pipe lines, valves

PN16

Nominal pressure 16

Pipe lines, valves