Dopak bottle septa

Dopak sampling systems use a variety of septa materials and sizes. Make sure you have the correct Dopak bottle septa when sampling your hazardous chemicals. Dopak have stock of all septa ready for shipment. So, as the UK reps for Dopak you can contact us here for technical and commercial support if you have any questions.

Below is a technical description of each septa material along with the individual septum part numbers and septa set part numbers. When ordering septa please order them in sets and use the set part number mentioned below.

Order your Dopak septa directly from the Dopak warehouse

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Natural rubber septa

Excellent mechanical and elastic properties and is highly tear resistant. Due to the influence of sunlight and ozone aging resistance is moderate. For non-corrosive materials, and acidic and alcoholic solutions this material is suitable. Although its chemical resistance in general is moderate, short exposure time (e.g. less than 24 hours, as is not unusual in sampling situations) allows for application with many more aggressive chemicals.

Material	Bottle size	Septa PN	Set PN	Set quantity
Natural rubber	PP20	1126600	2003299	100
Natural rubber	PP22	TBA	TBA	100
Natural rubber	PP24	1125500	2006300	100
Natural rubber	PP25	1120000	1940000	127
Natural rubber	PP28	1120100	1940100	100
Natural rubber	GL32	1124200	1944200	100
Natural rubber	PP33	1124800	1944800	100
Natural rubber	PP36	1120200	1940200	100
Natural rubber	GL45	1120300	1940300	100

EPDM septa

Good mechanical and elastic properties, excellent aging and good chemical resistance capabilities. A low cost combined with the above features makes this septum a very good choice.

Material	Size	Septum PN	Set PN	Set quantity
EPDM	pp20	1126700	TBA	100
EPDM	pp22	TBA	TBA	100
EPDM	pp24	1125600	TBA	100
EPDM	pp25	1120400	1940400	127
EPDM	pp28	1120500	1940500	100
EPDM	GL32	1124300	1944300	100
EPDM	pp33	1124900	1944900	100
EPDM	pp36	1120600	1940600	100
EPDM	GL45	1120700	1940700	100

Silicone rubber septa

Good mechanical and elastic properties. Its prime advantages are excellent heat resistance and non-oxidizing properties. The complicated fabrication however makes it relatively expensive. Almost no aging occurs, and it is inert to most solvents with the possible exception of the aliphatic type.

Material	Bottle size	Septa PN	Set PN	Set quantity
Silicone	pp20	1126800	TBA	100
Silicone	pp22	TBA	TBA	100
Silicone	pp24	1125700	TBA	100
Silicone	pp25	1120800	1940800	127
Silicone	pp28	1120900	1940900	100
Silicone	GL32	1124400	1944400	100
Silicone	pp33	1125000	TBA	100
Silicone	pp36	1121000	1941000	100
Silicone	GL45	1121100	1941100	100

Teflon coated butyl rubber septa

The combination of these two materials provide the best choice when considering elasticity properties and chemical and tear resistance. The elasticity and high tear resistance of the butyl is combined with the almost total chemical inertness of the PTFE (thickness 0.2 mm). The PTFE faces the sample liquid, providing optimal chemical compatibility; the butyl rubber backing provides the seal, only a very large tear would allow contact between the butyl rubber and the sample medium, therefore this septum can only be used with smaller needle sizes.

Material	Bottle size	Septa PN	Set PN	Set quantity
Teflon coated butyl	pp20	1126900	TBA	100
Teflon coated butyl	pp22	2019272	2019274	100
Teflon coated butyl	pp24	1124700	1944700	100
Teflon coated butyl	pp25	1121600	1941600	127
Teflon coated butyl	pp28	1121700	1941700	100
Teflon coated butyl	GL32	1124100	1944100	100
Teflon coated butyl	pp33	1125100	1945100	100
Teflon coated butyl	pp36	1121800	1941800	100
Teflon coated butyl	GL45	1121900	1941900	100

Teflon coated silicone septa

Incorporates the advantages of silicone and PTFE. The heat-resistance of both materials and the total chemical inertness of the PTFE (thickness 0.2 mm) make this septum the best choice when sampling at elevated temperatures. The PTFE faces the sample liquid in the same manner as the PTFE coated butyl septum, therefore attention to the needle sizes should be considered when using this material.

Material	Bottle size	Septa PN	Set PN	Set quantity
Teflon coated Silicone	pp20	1127100	TBA	100
Teflon coated Silicone	pp22	TBA	TBA	100
Teflon coated Silicone	pp24	1126000	TBA	100
Teflon coated Silicone	pp25	1122000	1942000	127
Teflon coated Silicone	pp28	1122100	1942100	100
Teflon coated Silicone	GL32	1123900	1943900	100
Teflon coated Silicone	pp33	1125300	TBA	100
Teflon coated Silicone	pp36	1122200	1942200	100
Teflon coated Silicone	GL45	1122300	1942300	100

Viton septa

(FKM, fluor elastomer or fluorcarbon rubber) has only moderate mechanical and elastic
properties. Prime advantages are the high maximum temperature is 210 °C (410 °F) and
good chemical resistance towards most materials and solutions.

Material	Bottle size	Septa PN	Set PN	Set quantity
Viton	pp20	1127000	1947000	100
Viton	pp22	TBA	TBA	100
Viton	pp24	1125900	TBA	100
Viton	pp25	1122400	1942400	127
Viton	pp28	1122500	1942500	100
Viton	GL32	1124500	1944500	100
Viton	pp33	1125200	TBA	100
Viton	pp36	1122600	1942600	100
Viton	GL45	1122700	1942700	100

Dopak support in the UK is available in many ways…telephone, email, direct message, social media. Contact us in whichever way works for you but we are your first point of call for all things Dopak. When youre ready to place your order send this to sales@dopak.nl