chemistry

TEX (explosive)

TEX (explosive) is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand TEX (explosive) rather than just read about it. In short: TEX (chemical name 4,10-dinitro-2,6,8,12-tetraoxa-4,10-diazatetracyclo[5.5.0.05,9.03,11]-dodecane) is a dense (ρ = 1.985 g cm−3) nitramine high explosive, that derives from the very powerful and sensitive high explosive CL-20. Though related to CL-20 in that is shares the same cage structure, TEX is more easily synthesized in good yield from inexpensive starting materials.

Key takeaways

TEX (explosive) belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect TEX (explosive) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of TEX (explosive) from memory before moving on to harder problems.

Reference excerpt

TEX (chemical name 4,10-dinitro-2,6,8,12-tetraoxa-4,10-diazatetracyclo[5.5.0.05,9.03,11]-dodecane) is a dense (ρ = 1.985 g cm−3) nitramine high explosive, that derives from the very powerful and sensitive high explosive CL-20. Though related to CL-20 in that is shares the same cage structure, TEX is more easily synthesized in good yield from inexpensive starting materials. Unlike CL-20, TEX is friction insensitive, bears a low impact sensitivity, and possesses a very low shock sensitivity and large critical diameter, making it an interesting explosive filler for insensitive munitions. Its systematic name, 4,10-dinitro-2,6,8,12-tetraoxa-4,10-diazatetracyclo[5.5.0.05,9.03,11]-dodecane derives from its tetracyclic structure.

Synthesis and production Unlike CL-20, which requires a cumbersome and even costly procedure, TEX is obtained in moderate yield (40 wt.-%) in a one-pot synthesis from 1,4-diformyl-2,3,5,6-tetrahydroxypiperazine (DFTHP) and mixed acid (H2SO4/HNO3). The DFTHP undergoes proton-catalyzed hydrolysis and yields glyoxal which reacts as with an intermediate to give TEX.

Performance Based on the Kamlet-Jacobs method, the formal idealistic detonation of TEX

C6H6N4O8 → 3 H2O(g) + 2CO2 + CO + 3 C(gr) + 2 N2 at ambient temperature and density of TEX (1.985 g/cm3) yields a detonation velocity of 8170 m/s and a CJ pressure of 31.4 GPa. Calculations with advanced computational algorithms like EXPLO and CHEETAH predict even higher detonation velocity but about similar values for the detonation pressure, definitely superseding insensitive high explosive NTO. Experimental determination with plastic bonded formulations at high theoretical maximum density exceed the predicted detonation pressures but fall a little short with regards to the detonation velocity if the charge diameter is below 90 mm.

Sensitivity TEX is not friction sensitive and requires some 40 Joules energy to react in the BAM impact tester. In the autoignition test it yields a mild burn response at 252 °C onset temperature. TEX is also mildly shock sensitive in the Large Scale Gap Test (LSGT).

Toxicity TEX has a similar water solubility as RDX and hence will be equally mobile in soil and groundwater. However, in comparison to insensitive explosive NTO, which is highly soluble in water (16 g/L), it should pose a lower level of concern when considering the environmental effects of unexploded or partially exploded charges. Preliminary investigation of the effects of TEX on daphnia and cell cultures show slightly lower toxicity than RDX.

Application Though known since 1990, TEX is still an experimental explosive. However, given its large critical diameter and low shock sensitivity, it is an ideal candidate for insensitive large-calibre ammunition such as general-purpose bombs, artillery shells, torpedoes and depth charges.

Illustrations

Worked examples

Example 1 — a first encounter with TEX (explosive)

Start with the simplest possible case. Write down what TEX (explosive) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to TEX (explosive) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about TEX (explosive) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of TEX (explosive)

In research: TEX (explosive) appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses TEX (explosive) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: TEX (explosive) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dioxolanes, Explosive chemicals, Heterocyclic compounds with 4 rings, so understanding it makes those chapters shorter.
In everyday life: Look for TEX (explosive) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study TEX (explosive) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what TEX (explosive) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain TEX (explosive) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is TEX (explosive) in simple terms?

Why does TEX (explosive) matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study TEX (explosive)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on TEX (explosive).