Is the TW coupling DIN 28450 with GW BSP, stainless steel with E-CTFE lining, type MK suitable for handling hydrofluoric acid at 100Â°C?

TW coupling DIN 28450 with GW BSP, stainless steel with E-CTFE lining, type MK is generally suitable for handling hydrofluoric acid at 100Â°C. E-CTFE (ethylene-chlorotrifluoroethylene) offers very high chemical resistance across a wide temperature range (approx. â40Â°C to +130Â°C) and is noted as resistant to all acids, alkalis and aggressive media. The product description explicitly states it is used where AISI 316 stainless steel is insufficient, and its maximum service temperature exceeds 100Â°C, supporting compatibility. However, hydrofluoric acid is exceptionally aggressive and can attack some fluoropolymers under certain conditions (concentration, presence of catalysts, stress, and prolonged exposure). Therefore, final suitability must be confirmed by: 1) verifying HF concentration and contact duration, 2) consulting manufacturerâs specific chemical compatibility data for E-CTFE with the given HF concentration and temperature, and 3) ensuring mechanical/assembly factors (seals: hypalon or PTFE) are compatible with HF at 100Â°C. If manufacturer confirmation is obtained that E-CTFE and the listed seals are rated for the exact HF concentration and 100Â°C, the coupling can be used.

Can the TW coupling DIN 28450 with GW BSP, stainless steel with E-CTFE lining, type MK be used for long-term service with strong oxidizing acids at 120Â°C?

TW coupling DIN 28450 with GW BSP, stainless steel with E-CTFE lining, type MK Format can be used for long-term service with strong oxidizing acids at 120Â°C only with caution. E-CTFE lining offers excellent chemical resistance up to about +130Â°C and is resistant to strong acids, but long-term exposure to strong oxidizers at the upper temperature limit can accelerate degradation depending on acid type, concentration and oxidizing strength. Stainless steel body (AISI 316) may be insufficient against strong oxidizers. Recommend consulting the acidâs specific compatibility data (concentration, redox potential), performing manufacturer confirmation or compatibility tests, and considering higher-alloy metals or alternative linings if the acid is highly oxidizing at 120Â°C.

Can TW coupling DIN 28450 with GW BSP, stainless steel with E-CTFE lining, type MK be used for continuous service with strong bases at 130Â°C?

Yes. TW coupling DIN 28450 with GW BSP, stainless steel with E-CTFE lining, type MK can be used for continuous service with strong bases at 130Â°C. Reasoning: the product description states E-CTFE lining offers very high chemical resistance over approximately â40Â°C to +130Â°C and is resistant to all acids, alkalis and aggressive substances across pH 1â14. Where corrosion resistance of AISI 316 stainless steel is insufficient, the E-CTFE lining provides the necessary protection. Given the stated maximum temperature rating (â+130Â°C) and explicit resistance to strong bases, the coupling is suitable for continuous service with strong alkaline media at 130Â°C, provided that operating conditions (pressure, mechanical stress, compatibility of hypalon/Teflon seals if exposed to the media or temperature) match the product specifications and any relevant safety/installation guidelines.

TW coupling DIN 28450 with GW BSP, stainless steel with E-CTFE lining, type MK

Additional information

Material	SS – stainless steel

Loading connection socket TW type MK with internal BSP thread and E-CTFE lining. Manufactured according to standard EN ISO 14420-6 (formerly DIN 28450). Used for the most chemically aggressive media, for which the corrosion resistance of AISI 316 stainless steel is insufficient. E-CTFE is characterized by very high chemical resistance over a wide temperature range (approximately from -40°C to +130°C). It is resistant to all acids, alkalis, and other aggressive substances (pH range 1 ÷ 14). It has high mechanical properties, particularly hardness and abrasion resistance. Material: stainless steel. Connection sealing (seal type GSD, for 4″ type TWO): hypalon. Thread sealing (seal type GD): teflon.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
TW-MK-050-SSE	MK50 connector (TW 1502) with 2" BSP thread, AISI 316 / E-CTFE	-	16	In stock	Enquiry
TW-MK-080-SSE	MK80 connector (TW 502) with 3" BSP thread, AISI 316 / E-CTFE	-	16	In stock	Enquiry
TW-MK-100-SSE	MK100 connector with 4" BSP GW, AISI 316 / E-CTFE	-	16	In stock	Enquiry

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Loading connection socket TW type MK with internal BSP thread and E-CTFE lining. Manufactured according to standard EN ISO 14420-6 (formerly DIN 28450). Used for the most chemically aggressive media, for which the corrosion resistance of AISI 316 stainless steel is insufficient. E-CTFE is characterized by very high chemical resistance over a wide temperature range (approximately from -40°C to +130°C). It is resistant to all acids, alkalis, and other aggressive substances (pH range 1 ÷ 14). It has high mechanical properties, particularly hardness and abrasion resistance. Material: stainless steel. Connection sealing (seal type GSD, for 4″ type TWO): hypalon. Thread sealing (seal type GD): teflon.