Valve Material Chemical Compatibility & Butterfly Valve Component Specification Guide

Article Summary

This technical reference provides comprehensive chemical compatibility ratings, continuous operating temperature limits, and core performance characteristics for standard industrial valve construction materials, including elastomers, engineering thermoplastics, cast irons, carbon steel, stainless steels, and non-ferrous alloys. It also details standard material options for butterfly valve bodies, sealing elements, and valve discs. All material designations conform to both ASTM (US) and EN (European) industrial standards, with temperature values presented in both degrees Celsius (°C) and Fahrenheit (°F). This document is engineered for global valve application engineering, procurement specification, and product technical documentation.

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1. Suitability Rating Legend

Ratings indicate general material compatibility with common process media. Final material selection shall always be verified against actual operating conditions including media concentration, working pressure, flow velocity and temperature cycling.

●	Recommended
○	Suitable
△	Limited
✕	Forbidden

2. Material Chemical Compatibility Reference Table

Material	Medium Compatibility Rating															Temp. Range	Key Feature
Material	Fresh Water	Seawater	Salts	Strong Bases	Weak Bases	Strong Acids	Weak Acids	Natural Gas	Alcohols	Air	Steam	Oils	Food Grade	Acid-Alkali	Sewage	Temp. Range	Key Feature
NBR	●	●	●	●	○	△	●	●	●	●	✕	●	○	●	●	-10~100°C / 14~212°F	Oil Resistant
EPDM	●	●	●	●	○	△	●	○	○	●	✕	●	●	△	●	-10~120°C / 14~248°F	Weather Resistant
EPDM-HT	●	●	●	●	●	✕	●	○	○	●	✕	●	●	●	●	-10~160°C / 14~320°F	Heat & Abrasion Resist.
NR	●	●	●	●	●	△	○	✕	●	●	✕	✕	✕	✕	✕	-20~80°C / -4~176°F	High Resilience
CR (Neoprene)	●	●	○	●	●	●	●	●	△	●	✕	✕	○	●	●	-40~82°C / -40~180°F	UV Resistant
VMQ (Silicone)	●	●	○	✕	●	●	●	○	○	●	●	△	△	✕	○	-10~150°C / 14~302°F	High Heat Resist.
FKM (FPM)	●	●	●	△	●	●	●	△	●	●	●	●	●	✕	○	-10~200°C / 14~392°F	Heat & Chem Resist.
PTFE	●	●	●	●	●	●	●	●	●	●	●	●	●	✕	△	-10~150°C / 14~302°F	Non-Stick & Chem Resist.
PPL	●	●	●	✕	●	✕	●	●	●	●	●	●	△	△	△	-15~380°C / 5~716°F	Ultra High Temp
PVC	△	△	△	●	●	✕	●	✕	✕	●	✕	○	△	✕	●	-8~110°C / 18~230°F	Aging Resistant
UPVC	●	●	✕	●	●	○	●	●	△	●	△	●	●	✕	●	-12~115°C / 10~239°F	Corrosion Resistant
ABS	✕	✕	✕	△	△	△	△	△	✕	●	✕	●	●	✕	✕	-15~110°C / 5~230°F	Non-Toxic
Gray Iron	●	✕	✕	✕	●	△	△	○	●	●	●	✕	●	●	●	-5~330°C / 23~626°F	High Temp Resist.
Ductile Iron	●	✕	△	✕	△	✕	△	○	○	●	●	●	△	●	●	-30~350°C / -22~662°F	Low & High Temp
Carbon Steel WCB	●	✕	△	✕	△	△	●	●	●	●	●	△	●	●	●	-29~425°C / -20~797°F	High Temp Resist.
202 SS	△	●	●	✕	●	○	●	✕	●	●	●	●	○	●	○	-190~525°C / -310~977°F	Pressure & Temp Resist.
304 SS	△	●	●	●	●	○	●	●	●	●	●	●	●	✕	●	-268~538°C / -450~1000°F	Corrosion & Temp Resist.
316 SS	●	●	●	●	●	●	●	●	●	●	●	●	●	✕	●	-268~538°C / -450~1000°F	Superior Corrosion Resist.
316L SS	●	●	●	●	●	●	●	●	●	●	●	●	●	✕	●	-268~538°C / -450~1000°F	Superior Corrosion Resist.
2507 Duplex	△	●	●	○	●	△	●	●	●	●	●	●	●	✕	●	-230~510°C / -382~950°F	Superior Corrosion Resist.
Alloy 926	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	-273~550°C / -459~1022°F	Ultra Corrosion Resist.
Brass	△	✕	✕	✕	✕	✕	●	●	●	●	●	○	✕	✕	△	-100~220°C / -148~428°F	Heat Resistant
Aluminum Bronze	●	●	●	✕	✕	△	△	●	●	●	●	●	●	✕	○	-272~232°C / -458~450°F	Heat & Corrosion Resist.

Note: This data table is for reference only. Verify compatibility under actual operating conditions.

3. Butterfly Valve Component Material Options

3.1 Valve Body Materials

Ductile Iron (ASTM A536 Grade 65-45-12 / EN-GJS-450-10)
304 SS (AISI 304 / EN 1.4301)
316 SS (AISI 316 / EN 1.4401)
Carbon Steel WCB (ASTM A216)
Aluminum Alloy

3.2 Seat / Seal Materials

EPDM
NBR
TPU (Wear Resistant Grade)
PTFE
VMQ (Silicone)
NR (Natural Rubber)
FKM (Fluorocarbon Elastomer)
EPR (Heat Resistant EPDM)
CR (Neoprene)

3.3 Valve Disc Materials

Ductile Iron (ASTM A536 Grade 65-45-12 / EN-GJS-450-10)
304 SS (AISI 304 / EN 1.4301)
316 SS (AISI 316 / EN 1.4401)
316L SS (AISI 316L / EN 1.4404)
2205 Duplex (EN 1.4462 / UNS S32205)
2507 Duplex (EN 1.4410 / UNS S32750)
Bronze (Commercial Grade)
Alloy 926 (EN 1.4529 / UNS N08926)
Super Duplex 1.4469 (EN 1.4469 / UNS S32760)