SIL 391 TWO -- Double-layered silicone hose with increased robustness and 280 C capacity

Why this hose?

SIL 391 TWO is constructed for a specific application where material and temperature capacity must match the requirement. Silicone, double-layered is chosen because it provides the right balance between flexibility, chemical resistance and temperature capacity.

Continuous industrial operation subjects the hose to daily pressure cycles, mechanical wear and temperature variation. The difference to a standard hose lies in the material's formulation and the reinforcement's dimensioning.

In daily use, the hose's life cycle is 5-10 years depending on load. Preventive maintenance with annual inspection extends the service life.

Where it is used

SIL 391 TWO is typically used in industrial contexts where a standard hose cannot handle the load. Specific application depends on the variant - see intro for details.

The hose is typically mounted between a source and a destination via metal or polymer couplings. We advise on sizing and couplings.

Industrial installation often requires pressure testing at commissioning and annually thereafter. This is documented in the installation history.

SIL is colloquially known as a silicone hose or high-temperature hose.

Technical specifications

Specifications are applicable per the manufacturer's factsheet.

Material	Silicone, double-layered
Colour	white / light
Temperature	-40 to +280 C
Pressure class	See dimension table
Construction	Silicone, double-layered with reinforcement

Dimensions and ordering

The dimension table shows the standard variants the hose is produced in.

Dimensions, pressure and vacuum data for SIL 391 TWO
Inner Ø [mm]	Outer Ø [mm]	Working pressure DIN 26057, 10 % elong. [bar]	Vacuum axially fixed [bar]	Bend radius [mm]	Max. length [m]	Weight [kg/m]	Roll [m]	Article no.
13	16	3	0.74	10	4	0.04	—	39100132005
19	22	3	0.73	13	10	0.11	4	39100192005
22	25	3	0.72	14	4	0.17	4	39100222005
25	30	2.8	0.71	18	10	0.19	4	39100252005
32	36	2.7	0.65	20	4	0.28	4	39100322005
35	40	2.6	0.6	22	4	0.29	—	39100352005
38	43	2.6	0.6	24	12	0.31	4	39100382005
41	46	2.6	0.59	26	10	0.32	—	39100412005
44	49	2.6	0.58	27	20	0.32	4	39100442005
51	56	2.6	0.52	31	20	0.27	4	39100512005
57	62	2.5	0.48	34	4	0.43	4	39100572005
60	65	2.4	0.46	36	6	0.46	—	39100602005
63	68	2.4	0.46	37	5	0.49	4	39100632005
65	69	2.4	0.46	37	28	0.5	—	39100652005
70	75	2.1	0.44	40	9	0.54	4	39100702005
76	81	2.1	0.43	43	8	0.58	4	39100762005
80	85	2.1	0.42	45	10	0.6	4	39100802005
83	88	2.1	0.41	47	11	0.63	4	39100832005
89	94	2	0.4	50	16	0.45	4	39100892005
95	100	1.9	0.37	53	4	0.73	4	39100952005
102	107	1.9	0.35	56	48	0.77	4	39101022005
108	114	1.8	0.33	60	4	0.81	4	39101082005
114	120	1.5	0.3	63	5	0.85	4	39101142005
121	127	1.5	0.24	67	4	0.89	4	39101212005
127	133	1.4	0.23	70	8	0.93	4	39101272005
130	136	1.3	0.2	74	4	2.5	—	39101302005
140	146	1.3	0.2	76	5	1	4	39101402005
152	158	1.2	0.17	82	32	1.2	4	39101522005
160	166	1.1	0.16	86	4	1.31	—	39101602005
165	171	1.1	0.14	89	4	1.36	—	39101652005
178	184	1	0.12	95	12	1.43	4	39101782005
203	209	0.7	0.09	108	15	1.65	4	39102032005
254	260	0.5	0.07	133	6	2.09	4	39102542005
305	311	0.5	0.07	159	10	2.61	4	39103052005

Fields without a value are not specified in the manufacturer's factsheet. Pressure values are recommended operating limits. Bend radius is measured along the inside of the hose bend.

Standards and compliance

The hose is manufactured in accordance with the following standards.

EN ISO 1307:2008. European standard for rubber pressure hoses for general applications.
EN 12115. Rubber and thermoplastic pressure hose standard.
RoHS directive (2011/65/EU). Restriction of hazardous substances; manufacturer declaration available.
REACH (EC 1907/2006). Registration of chemical substances.
ISO 9001. The manufacturer's quality management system is certified.
EN ISO 8031. Measurement of electrical resistance in rubber hoses.
DIN 4815. Corrugated industrial hoses (specifically for corrugated variants).

Documentation and downloads

Additional documents about this hose, its compliance and installation. Click to download as PDF in a new tab.

Datasheet (Particulair) Our 4-page datasheet with specifications, dimension table, applications and contact info. PDF REACH declaration Manufacturer declaration of REACH compliance (EC 1907/2006). PDF · 2026 RoHS declaration Manufacturer declaration of RoHS directive compliance. PDF · 2025 ISO 9001 certificate Quality management certificate for the production. PDF Installation guidelines General installation guidelines. PDF · 2025

Help with material selection

Although this hose isn't ATEX-relevant, these two articles provide useful background on electrical resistance and industrial safety — important if you later combine the hose with electrical equipment or work in mixed environments:

ESD

The invisible weakest link

Why a conductive or antistatic hose isn't sufficient on its own — and what grounding means for the complete system.

Read the article

ESD

Know your ohm

The difference between antistatic and conductive, which resistance limits apply where, and how to measure them correctly.

Read the article

Industries that use it

The NEO 390 and SIL 391 series are high-temperature hoses for hot-air and cooling applications. NEO in neoprene (up to 150 C), SIL in silicone (up to 280 C).

Hot-air drying is one of the most temperature-exposed applications in industry. Granulate drying before injection moulding requires 100-150 C air, while certain high-temperature processes require 200-280 C. NEO and SIL cover the entire spectrum.

Neoprene's elastic properties are retained up to 150 C - above that level the material begins to harden. Silicone retains elasticity all the way up to 280 C, making it the preferred material in pharma and clean rooms.

The ONE variants are single-layered and lighter; the TWO variants are double-layered with increased pressure and abrasion resistance. Choose variant according to the actual mechanical load in the application.

Custom lengths and assemblies

The hose can be delivered cut to desired lengths. The standard roll lengths can be supplemented with shorter pieces or continuous rolls by arrangement.

At Particulair we are happy to advise on couplings and sizing. Send us your application sketch and we will assess the right variant.

See our custom hose assemblies

Related hoses

Hoses often considered alongside this one. Suggestions are based on the same category and similar properties.

Frequently asked questions

What is the difference between NEO and SIL?

NEO 390 is a neoprene hose (CR rubber), suitable for 150 C. SIL 391 is silicone, suitable for 280 C. Choose by the highest temperature the hose will encounter - silicone gives twice the temperature capacity but is more expensive.

What do ONE and TWO mean?

ONE = single-layered construction, lighter and more flexible. TWO = double-layered construction, higher pressure and abrasion resistance. Choose ONE for normal hot-air applications, TWO for demanding industrial or high-pressure applications.

Can NEO/SIL be used for liquid transport?

Both series are primarily intended for gas/air. SIL can handle certain liquids if compatible (e.g. diluted soapy solutions). For continuous liquid transport, a specific liquid hose must be selected.

Which standards do NEO/SIL comply with?

Both series are constructed per EN ISO 1307 (rubber pressure hoses). SIL additionally has FDA 21 CFR 177 and EU 1935/2004 considered for food contact. NEO has TRGS 727 assessment for certain industrial applications.

Which couplings are recommended?

For high-temperature applications, metal couplings (stainless steel or brass) are recommended - plastic couplings can melt at temperatures near the hose's upper limit. Stainless steel worm-drive clamps are a common choice.

How long does NEO/SIL last?

Service life depends on temperature load. With continuous operation near the upper temperature limit (150 C for NEO, 280 C for SIL), 2-5 years service life is typical. At mild temperatures (below half the limit) the hose can last 10-15 years.

Is silicone food-grade?

The SIL 391 series has components meeting FDA 21 CFR 177 and EU 1935/2004 for food contact. Specific approval for the individual product is shown on the factsheet. The NEO 390 series is NOT food-grade.

Can the hose be delivered in other lengths?

Yes - the standard roll lengths can be supplemented with shorter pieces or continuous rolls by arrangement. We advise on compatible couplings for hot-air applications.

SIL 391 TWO