Die datummerk en die allergeen is op die verpakkingsmateriaal.

Because die is the Afrikaans definite article, meaning the. It is often repeated before each noun in a list when each noun is being referred to separately and definitely.

So:

• die datummerk = the date mark
• die allergeen = the allergen

Repeating die makes it clear that both nouns are definite. This is very natural in Afrikaans.

In Afrikaans, the present tense of to be is is for both singular and plural.

So Afrikaans says:

• Dit is = It is
• Hulle is = They are

Unlike English, Afrikaans does not switch between is and are in the present tense. So Die datummerk en die allergeen is ... is completely normal.

Yes. Afrikaans very often forms compound nouns by writing them as one word.

So datummerk is a compound noun:

• datum = date
• merk = mark

English often writes similar ideas as two words or with a modifier, but Afrikaans strongly prefers one-word compounds in cases like this.

This is something English speakers often need to get used to.

Allergeen is a noun. In this sentence it is singular and definite because it has die before it: die allergeen.

Even if English might sometimes talk about allergen information rather than a single allergen, Afrikaans can still use a singular noun depending on the context. The exact nuance depends on how the label or packaging is being described.

Grammatically, though, it is simply:

• die allergeen = the allergen

Op is a preposition meaning on.

So:

• op die verpakkingsmateriaal = on the packaging material

It shows location: where the date mark and allergen appear.

This works much like English on in sentences such as:

• The label is on the box.
• The information is on the packaging.

It is grammatically singular here.

Verpakkingsmateriaal is another compound noun:

• verpakking = packaging
• materiaal = material

Together, it usually refers to packaging material as a mass/collective idea, much like English material can. So even though it may refer to packaging in a broad sense, the noun itself is singular in form here.

That -s- is a linking sound often found in Afrikaans compound nouns.

So:

• verpakking
  • materiaal becomes
• verpakkingsmateriaal

You cannot always predict these linking letters perfectly from English, so they are often best learned as part of the whole word. Afrikaans compounds may use no linker, or a linker like -s-, depending on the word.

The sentence follows the normal Afrikaans main-clause pattern:

Subject + verb + rest

So here we get:

• Die datummerk en die allergeen = subject
• is = verb
• op die verpakkingsmateriaal = prepositional phrase

This is very similar to ordinary English word order in a simple statement.

Usually, repeating die is the clearer and more natural choice here.

• Die datummerk en die allergeen sounds straightforward and standard.
• Leaving out the second die can sound less balanced or less precise.

In some contexts, Afrikaans can omit a repeated article, but with two separate definite nouns like these, repeating die is the safer and more natural pattern for learners.

No. Afrikaans does not use different definite articles for masculine, feminine, and neuter nouns the way some European languages do.

That is why die works for all of these:

• die datummerk
• die allergeen
• die verpakkingsmateriaal

So you do not have to memorize noun gender to choose the article.

The article would still be die, and the verb would still be is in the present tense.

For example, plural nouns might give you something like:

• Die datummerke en die allergene is op die verpakkingsmateriaal.

Notice two useful points:

• die stays the same
• is also stays the same

That is one of the simpler parts of Afrikaans grammar for English speakers.