Natural vs. Artificial Casings: Which for What?

# Natural vs. Artificial Casings: Which Casing for What?

You're standing in front of the shelf at your local butcher shop or scrolling through the online store and wondering: natural casing or artificial casing – which one should I actually use for my homemade sausage? This question comes up sooner or later for anyone who gets serious about sausage making. And the honest answer is: it depends. But don't worry – after this guide, you'll know exactly which casing is the right choice for which sausage.

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What's Actually the Difference?

Before we dive into the details, let's cover the basics.

Natural casings are exactly what the name suggests: cleaned animal intestines, usually from pigs, sheep, cattle, or horses. They're supplied salted or dried and need to be soaked in water before use. Natural casings are edible, breathable, and give sausage its characteristic flavor during smoking and curing.

Artificial casings, on the other hand, are industrially manufactured products. There are two main categories:

• Collagen casings: Made from animal collagen (beef hide), edible or non-edible depending on type
• Cellulose casings: Plant-based, non-edible, removed before consumption
• Plastic casings: Made from polyamide or similar materials, non-edible, for cooked sausages and sliced meats

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Natural Casings: The Classic Choice for Artisanal Sausage

Overview of Different Natural Casing Types

Why Natural Casings Are So Special

Natural casings have one crucial property that no artificial casing can fully replicate: they breathe. The semi-permeable structure allows moisture and smoke to pass through evenly – that's why traditional smoked sausages made from natural casings taste aromatic, deep, and complex.

During smoking at temperatures between 60 and 90°C (140–194°F), a natural casing absorbs smoke aroma optimally. The surface develops a slight caramelization, and the golden-brown to mahogany color only looks this beautiful with authentic natural casings.

Other advantages of natural casings:

• Bite feel: The characteristic "snap" when you bite into a bratwurst comes from natural casing
• Edibility: No annoying peeling – everything goes on the grill and straight into your mouth
• Traditional appearance: Slight irregularities and natural curves give the sausage artisanal character
• Smoking-friendly: Optimal smoke absorption for intense flavors

Disadvantages and Challenges

Natural casings demand a bit of patience from you. They need to be soaked for 30 to 60 minutes (salted casings), and dried varieties need up to 2 hours. Plus, they're more delicate during stuffing – too much pressure when filling can cause tears. This especially happens to beginners who pack the mixture too tightly or don't carefully prick out air bubbles.

Shelf life in unsalted form (salted, in the refrigerator) is several months to up to a year. Still, once opened and soaked, you need to process them within 2 to 3 days.

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Artificial Casings: Precision and Consistency for Modern Sausage Making

Collagen Casings – the Middle Ground

Collagen casing is, in a sense, a compromise between nature and technology. It's made from collagen in beef hide and has a structure more similar to natural casing than plastic casings. Edible collagen casings are used primarily for fresh bratwurst and knockwurst and are comparatively easier to work with:

• Uniform diameter: No searching for matching sections, no sorting
• No soaking needed (with most types)
• Lower tear risk during stuffing
• Long shelf life when stored dry at room temperature (12–24 months)

During smoking, collagen casings perform decently – they take on color and produce an acceptable surface. The snap factor doesn't quite match good natural casing, but for home use it's absolutely satisfactory.

Cellulose Casings – the Helper for Calibration

Cellulose casings are used mainly for cured sausages, salami, and mettwurst, when uniform diameter and controlled drying are important. The advantage: they're water-vapor permeable, which affects ripening and drying – similar to natural casing, but with absolutely constant diameter.

For smoking cured sausage at cold-smoke temperatures of around 15 to 25°C (59–77°F), cellulose casings work well. They allow smoke through but retain more moisture than natural casing, which sometimes extends ripening time.

Important: Cellulose casing is always removed before eating. After ripening, it often sticks slightly to the sausage – briefly dampening it makes peeling easier.

Plastic Casings (Polyamide) – for Cooked Sausages and Sliced Meats

Polyamide casings are impermeable to smoke or moisture. They're the right choice for:

• Fleischkäse (German meatloaf)
• Liver sausage and blood sausage (cooked)
• Lyoner and mortadella
• Any sliced sausage

These casings handle temperatures up to 120–130°C (250–266°F) without any problem and are ideal for scalding or cooking in a water bath at 70–80°C (158–176°F). They keep the sausage in shape and provide clean cut surfaces when slicing.

Since no smoke penetrates, it makes little sense to smoke these sausage varieties – unless you want light surface coloring, which is actually standard for some lyoner varieties.

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Which Casing for Which Sausage? The Quick Decision Guide

Bratwurst and Grilling Sausage

Natural casing is the clear number one here. Sheep casing at 22–26 mm (0.9–1.0") for tender chipolatas and cevapcici, pork casing at 30–36 mm (1.2–1.4") for classic bratwurst. The snap when you bite in is a quality mark that only natural casing delivers.

If you want to play it safe or make bratwurst frequently, edible collagen casing is a solid alternative with significantly less filling errors.

Cured Sausages (Salami, Mettwurst, Plockwurst)

You have more flexibility here. Beef middle intestine at 50–65 mm (2.0–2.6") is traditionally the first choice for salami – the natural irregularities and breathable surface optimally support the ripening microflora.

For beginners, collagen casing or cellulose casing in the same diameter is easier to handle. Ripening proceeds more predictably because the diameter stays exactly the same.

Ripening temperature: 12–18°C (54–64°F), humidity 75–85%

Smoking: Cold smoke at maximum 25°C (77°F), 2–6 hours depending on recipe

Brewed Sausage (Bockwurst, Knockwurst, Wiener)

For classic knockwurst: natural casing or edible collagen casing at 20–32 mm (0.8–1.3"). The sausage is brewed at 70–75°C (158–167°F) until an internal temperature of 70–72°C (158–162°F) is reached, then plunged into cold water. That gives it the typical snap.

For larger brewed sausages like fleisch wurst, use plastic casings or beef rounds in appropriate diameters.

Cooked Sausages (Liver Sausage, Blood Sausage)

Plastic casings or natural large intestine – both work, depending on the desired appearance. Cooked sausages are cooked at 75–80°C (167–176°F) in a water bath or kettle until reaching an internal temperature of 72–75°C (162–167°F). The sausage stays in its casing and is either sliced or spread on bread.

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Practical Tips for Handling Casings

Preparing Natural Casings Correctly

• Soak salted casings for at least 30–60 minutes in lukewarm water (30–35°C / 86–95°F)
• Change water several times to remove excess salt
• Pull casing over the stuffer nozzle and check for holes
• During filling: keep pressure steady, don't trap air bubbles
• Prick air bubbles with a fine needle before smoking or cooking

Using Artificial Casings Correctly

• Lightly dampen collagen casings (10–15 seconds in water) for better glide
• Don't soak polyamide casings – use them dry
• When tying off polyamide casings, don't pull too tight – the material stretches when heated

Common Mistakes and How to Avoid Them

• Casing bursts during filling: Too much pressure, casing not sufficiently soaked, or damaged → Reduce pressure, soak longer
• Wrinkles and air pockets: Air trapped inside → Prick before smoking, fill more evenly
• Uneven browning during smoking: Casing too wet → Let air-dry for 1–2 hours after filling (pellicle formation)
• Casing separates during cooking: Collagen casing with too high temperature or wrong type → Check heat stability on packaging

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Natural Casings for Beginners: Where to Start?

If you've never worked with natural casings before, I recommend this progression:

• Pork small intestine (30–36 mm / 1.2–1.4"): Ideal for your first bratwurst. More forgiving than sheep casing, but still has good bite.
• Sheep casing (22–26 mm / 0.9–1.0"): For finer sausages like chipolata. A bit more delicate, but the result is unbeatable.
• Beef middle intestine (55–65 mm / 2.2–2.6"): When you're ready to try salami or coarser cured sausage.

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Summary

The choice between natural and artificial casings isn't a question of good versus bad – it's about the right tool for the right job. Here are the key points at a glance:

• Natural casings are the first choice for bratwurst, cured sausages, and any sausages that should have characteristic snap and intense smoke aroma
• Edible collagen casings are the practical alternative for beginners or large batches – reproducible and easy to handle
• Cellulose casings work well for cured sausage with exact diameter when you value controlled ripening
• Plastic casings (polyamide) are the right choice for cooked sausages, sliced meats, and fleischkäse

With this knowledge, you'll approach your next sausage project much more strategically. Go ahead and try different types – the craft lies in the details, and the difference between a bratwurst in natural casing and one in collagen casing is a genuine aha-moment on your first attempt.