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DualSeal (Double cap)

DualSeal - Airtight-Double-Cap Bottled Reagents

In December 2017, we introduced our newly developed double cap system "DualSeal" for moisture/oxygen sensitive products allowing you to keep them in good condition until the last drop. We will continuously increase our usage of DualSeal across our product portfolio.

DualSeal bottle

Features of DualSeal

  • Air-sensitive reagents can be safely dispensed without exposure to air
  • Even after piercing the septum cap, the PTFE sheet on the blue cover cap provides sealing protection.
  • Easy to dispose of caps and bottles separately

What is DualSeal?

DualSeal consists of two parts; the blue outer cap and the white septum cap both of which can be screwed on and off.
No additional sealing is required after piercing the septum cap with a needle. Just screw the outer-cap back in place.

Blue cap

Blue cap

The blue cap has a convex structure on the inside.
By filling the space where air and moisture stay, the material is protected from moisture and oxygen even after piercing the septum cap with a needle.

White cap

White cap

The white septum cap has a wide septum surface for ease of use, and features two layers of rubber and a highly chemically resistant PTFE seal.
The septum cap body is made of polypropylene and contains a screw thread allowing for easy removal from the bottle. The septum cap is closed with high torque to ensure an airtight seal.

How to use DualSeal

  1. Clamp and secure the reagent bottle before opening.
  2. Carefully unscrew the blue outer cap only. Place the cap near the bottle while in use.
  3. To prevent air from entering the container, insert a needle with a balloon filled with an inert gas such as argon or nitrogen. Then insert a syringe needle through the septum surface of the white cap.
    Common Usage of DualSeal
  4. Fill the syringe with the required amount of liquid.
  5. Remove the syringe, inject the liquid into your reaction vessel and safely dispose of the needle.
  6. Take the blue cap and screw it tightly back in place.
  7. Unclamp the DualSeal bottle and place it in its proper storage location.
Caution
• Do not dispose of the inlaid PTFE sheet! Keep it as it is during use! This PTFE sheet acts as a second layer air seal.
PTFE sheet of DualSeal blue cap
• Do not place anything on the septum cap! This will significantly reduce seal quality.
Do not place anything on the septum cap

• Repeated use can lead to increasing the number of holes or increasing the size of existing holes and will over time lead to an increase in air leakage. To prevent deterioration of the septum, reduce the number of injections as much as possible, or purchase a smaller bottle size.

  • In the case of halogenated solvent solutions such as dichloromethane, we recommend a minimum number of injections because the punctured area of septum butyl rubber will be invaded by the vapor of the halogenated solvent, etc. Also, after removing the syringe needle, please be careful of contamination, as the solution on the needle tip may dissolve the butyl rubber.
  • Please note that if you remove the needle without withdrawing the reagent from inside the needle, the liquid may adhere to the septum and cause it to deteriorate.

【Example of how to transfer the entire content】

  1. Secure reagent bottles before opening.
  2. Open only the top lid (blue).
  3. ttach a needle to the PTFE tube for liquid delivery connected to the reaction vessel filled with inert gas. Insert the needle into the septum so that the tip of the needle reaches the bottom of the reagent bottle.
  4. The liquid is delivered by inserting a syringe filled with inert gas, or a needle connected to an inert gas pump, into the septum and sending inert gas into the gap in the reagent bottle.
  5. First remove the needle from the liquid delivery tube, then remove the needle that was delivering the inert gas.

How to remove the septum cap

Open the septum cap only when all of the liquid has been used up and you want to prepare for the disposal of the bottle.

  1. Clamp and secure the bottle before opening.
  2. Open the septum cap by unscrewing.
    The septum-cap is tightly closed with high torque to ensure airtightness. Using tools such as DualSeal cap opener or water pump pliers is recommended.

Caution

  • Do not remove the outer cap when you remove the septum cap.
  • Take extra care to avoid any spillage of inner liquid.
  • Once the cap has been opened, its airtightness cannot be guaranteed even if it is tightened again using a tool. The same applies when using a DualSeal cap opener.

DualSeal cap opener

A DualSeal cap opener is available for removing each double cap from the reagent bottle.

DualSeal Cap Opener Photo
DualSeal Cap Opener and DualSeal Bottle

We will send this cap opener to those who wish to receive it. Please apply using the web form linked below.

 

Click here for the "DualSeal Cap Opener Application Form"

Notes on bottle disposal

The cap and bottle can be separated for disposal.

  • Remove DualSeal by referring to "How to remove the septum cap"
  • Highly reactive reagents may be residing inside the cap. Please take the necessary precautions to avoid accidents due to exposure to oxygen or moisture.
  • Dispose of the bottle and the caps separately after ensuring that no chemical residue is left behind.

Examples of products using DualSeal

Volatile Solutions

B0527Boron Trifluoride - Ethyl Ether Complex100mL and 500mL
B2074Boron Trifluoride - Butyl Ether Complex (BF3 ca. 30%)500mL
B3122Bromomethane (ca. 2mol/L in Tetrahydrofuran)100mL
B43581,3-Butadiene (ca. 15% in Hexane)100mL and 500mL
B43591,3-Butadiene (ca. 15% in Toluene)500mL
B44111-Butene (ca. 10% in Toluene)100mL
C2882Chloroethane (ca. 17% in Ethyl Ether, ca. 2.0mol/L)100mL
C2883Chloroethane (ca. 15% in Tetrahydrofuran, ca. 2.0mol/L)500mL
D3948Dimethylamine (ca. 10% in Tetrahydrofuran, ca. 2mol/L)100mL
E0531Ethylamine (30-40% in Methanol)100mL
E0648Ethylaluminum Dichloride (17% in Hexane, ca. 1mol/L)100mL
H0959Hydrogen Bromide - Ethanol Reagent (10-20%) [for Esterification]100mL
H1060Hydrogen Chloride (ca. 1mol/L in Ethyl Acetate)500mL
H1061Hydrogen Chloride (ca. 1mol/L in Ethyl Ether)100mL
H1062Hydrogen Chloride (ca. 4mol/L in 1,4-Dioxane)500mL
I0909Isobutene (ca. 8% in Dichloromethane)500mL
I0910Isobutene (ca. 10% in Isopropyl Ether)100mL
I0911Isobutene (ca. 15% in Tetrahydrofuran)100mL and 500mL
M1016Methylamine (40% in Methanol, ca. 9.8mol/L)500mL
M2108Methylamine (ca. 7% in Tetrahydrofuran, ca. 2mol/L)100mL and 500mL
M2323Methylamine (ca. 9% in Ethanol, ca. 2mol/L)100mL
M25633-Methyl-1-butene (ca. 15% in Dichloromethane, ca. 2.5mol/L)100mL and 500mL
M25653-Methyl-1-butene (ca. 12.5% in Tetrahydrofuran, ca. 1.5mol/L)100mL
M2813Methyl Chloride (ca. 5.7% in Tetrahydrofuran, ca. 1mol/L)100mL
P2295Propyne (ca. 5% in Tetrahydrofuran, ca. 1mol/L)500mL
T2346Borane - Tetrahydrofuran Complex (8.5% in Tetrahydrofuran, ca. 0.9mol/L) (stabilized with Sodium Borohydride)100mL and 500mL
T2704Trimethylamine (ca. 13% in Tetrahydrofuran, ca. 2mol/L)100mL
T3614Trimethylamine (ca. 8% in Toluene, ca. 1mol/L)100mL
V0126Vinyl Bromide (ca. 14% in Ethyl Ether, ca. 1.0mol/L)100mL
V0127Vinyl Bromide (ca. 12% in Tetrahydrofuran, ca. 1.0mol/L)100mL
X0041Hydrogen Chloride - Methanol Reagent (5-10%) [for Esterification]100mL and 500mL
U0147Sulfur Dioxide (ca. 8% in Tetrahydrofuran, ca. 1.2 mol/L)100mL
U0148Sulfur Dioxide (ca. 2.5% in Dichloromethane, ca. 0.5 mol/L)100mL
T3957Trifluoroiodomethane (ca. 10% in Tetrahydrofuran, ca. 0.5mol/L)100mL
T3958Trifluoroiodomethane (ca. 10% in Dimethyl Sulfoxide, ca. 0.6mol/L)100mL

How to identify DualSeal packaging before placing an order

All products using DualSeal have a note in the “Packaging and Container” section on our Product Details page.

Inquiry about DualSeal

DualSeal caps alone are not offered for sale.
Please feel free to send us your questions about DualSeal by filling the Contact Us Form
Get in touch with us on email: Sales-EU@TCIchemicals.com

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