How to Choose the Right Silicone Foam Dressing for Pressure Sores and Wound Exudate Levels (2026 Guide)

To choose a silicone foam dressing, first judge how much fluid (exudate) the wound produces, then pick a size whose absorbent pad covers the wound with a margin of healthy skin, and finally choose a shape and border that suit the body location. Low-exudate wounds often do better under a thinner option such as a transparent film, while moderate-to-heavy exudate calls for a larger foam pad and more frequent checks. For sacral or tailbone pressure sores, a heart-shaped sacral dressing usually fits the area better than a square one. A clinician should guide care for deep, infected or worsening wounds.

What is a silicone foam dressing used for?

A silicone foam dressing is an absorbent foam pad with a soft silicone adhesive layer that touches the skin. The foam takes up wound fluid (exudate), while the silicone holds the dressing in place and is designed to lift off with less pulling on the surrounding skin than many conventional adhesives. That combination is why foam dressings are common in home care for wounds that produce some fluid and need coverage for more than a day.

Senvok offers silicone foam dressings in four sizes: 7.5 × 7.5 cm, 10 × 10 cm, 15 × 15 cm and 18 × 18 cm. All four use a five-layer bordered silicone foam construction, are latex-free and come individually wrapped. The 7.5 cm dressing is described as breathable and waterproof, with high fluid handling and gentle silicone adhesion intended for sensitive periwound skin.

Listed uses for the 7.5 cm and 15 cm sizes include pressure ulcers, leg ulcers, non-infected diabetic foot ulcers, post-op wounds, lacerations and abrasions. The 10 cm size lists pressure ulcers, leg ulcers, non-infected diabetic foot ulcers, surgical and post-op wounds, burns, skin tears, lacerations and abrasions.

A foam dressing is not the right tool for every wound. Wounds that are deep, bleeding heavily, showing signs of infection, or not improving need to be assessed by a clinician before you choose any dressing.

How do I assess wound exudate level before choosing?

Exudate is the fluid a wound releases. The amount matters more than almost anything else when picking a dressing: too little absorbency and fluid can leak onto the surrounding skin; too much absorbency on a dry wound offers little benefit.

The easiest home check is to look at the old dressing when you remove it:

A few practical tips:

• Check at the same time of day so you compare like with like.
• Note how far the stain spreads relative to the pad edge, not just whether there is a stain.
• Watch for changes in color, thickness or odor of the fluid; these are reasons to contact a clinician rather than simply switch dressings.

When film fits better than foam. For dry or low-exudate wounds, a transparent film can be the simpler choice. Senvok's transparent film dressings are made of clear adhesive polyurethane film and are listed for low-exudate wounds, IV sites, donor sites, lacerations and abrasions. Because the film is transparent, the wound can be visually inspected without removing the dressing. The film is rated for brief shower exposure only, not prolonged immersion. Sizes include 6 × 7 cm (100 pack), 10 × 12 cm (50 pack) and 15 × 20 cm (10 pack).

Choosing the right size: 7.5×7.5 vs 10×10 vs 15×15 vs 18×18

The number on the box is the outer size, including the adhesive border. What actually covers the wound is the smaller absorbent pad in the center. A common rule of thumb is to choose a dressing whose pad extends past the wound edges by roughly 2 cm (about 1 inch) on every side, so fluid spreading outward is still absorbed by foam rather than sitting under the adhesive.

How to narrow it down:

• 7.5 × 7.5 cm – for small wounds where a compact dressing sits better and a large border would be bulky or wrinkle.
• 10 × 10 cm – a middle size for wounds that a ~2.5-inch pad can cover with margin.
• 15 × 15 cm – for larger wounds, or for moderate exudate where you want extra foam area around a mid-sized wound on a flatter part of the body.
• 18 × 18 cm – the heart shape is designed for the sacrum and tailbone, a common pressure-sore site for people who spend long periods in bed or in a wheelchair. It is listed for moderate-to-heavy exudate wounds in the sacral/coccyx area.

If you are between two sizes, the larger one is usually the safer pick for moderate exudate, as long as the border can still lie flat on intact skin without creasing over joints or skin folds.

Border vs non-border foam dressings: which do you need?

Bordered foam dressings have an adhesive margin around the foam pad, so they stay in place without separate tape. They are convenient for home care because application is one step. The 7.5 cm Senvok dressing has a low-profile border described as giving secure wear and less traumatic removal, and the 15 cm version's low-profile border is described as aiding adhesion and flexibility while remaining easy to remove.

Non-border foam dressings are plain foam pads without an adhesive edge. They can often be cut to shape and are held in place with a secondary dressing, tape or bandage. They tend to suit situations such as:

• skin around the wound that is too fragile for any adhesive border,
• wounds needing an unusual shape the bordered pads cannot match,
• use under compression bandaging or wraps that already hold the dressing.

Senvok's current foam range is bordered only, so if a clinician has recommended a non-border foam, a different product type will fit better. If a primary dressing needs securing, Senvok's 10 × 12 cm transparent film is listed for fixing dressings, and it is described as elastic and conformable for elbows and awkward sites.

How often should you change a silicone foam dressing?

Foam dressings are designed for multi-day wear rather than daily changes. Product information for the 7.5 cm and 10 cm sizes says the dressing can stay in place for several days depending on exudate. Senvok's general guidance is typically every 3–5 days, depending on wound condition.

Change sooner when:

• fluid has spread close to or onto the border,
• the edges are lifting or the dressing has wrinkled and rolled,
• the dressing is soiled, which is common with sacral dressings near the area affected by incontinence,
• your clinician has given a specific schedule.

When removing, peel slowly and low to the skin while supporting the skin with your other hand. Each change is also a chance to look at the wound and surrounding skin. Increasing redness, warmth, swelling, new odor, pus or fever are reasons to contact a healthcare professional promptly.

Who should use foam dressings: pressure sores, surgical wounds, chronic wounds

Pressure sores (pressure ulcers). Pressure ulcers appear on the listed uses for the 7.5 cm, 10 cm and 15 cm sizes, and the heart-shaped 18 cm dressing is made for the sacral area. A dressing covers the wound surface; it does not replace the repositioning, cushioning and pressure-relief plan a care team recommends.

Surgical wounds. Post-op wounds are listed uses for these dressings. Always follow the surgeon's instructions on when a wound can be covered with a foam dressing and how often to check it.

Chronic wounds. Leg ulcers and non-infected diabetic foot ulcers are on the listed uses. Diabetic foot wounds in particular should be managed with a clinician's oversight.

When another product fits better:

• Dry or very low-exudate wounds: a transparent film may be enough.
• Infected, deep, tunneling or heavily bleeding wounds: get professional assessment first.
• Very fragile skin that cannot tolerate an adhesive border: a non-border foam with gentle retention.

Quick buying checklist

• Estimate exudate level from the last used dressing.
• Measure the wound and add about 2 cm on each side for the pad.
• Pick the shape for the body location (heart-shaped for the sacrum).
• Decide bordered vs non-border based on the surrounding skin.
• Buy enough for several days of changes, with spares for unexpected leaks.

FAQ

What size silicone foam dressing do I need for a pressure sore?

Choose a dressing whose absorbent pad covers the wound with roughly 2 cm (about 1 inch) of margin on each side. For sores on the sacrum or tailbone, Senvok's 18 × 18 cm dressing is heart-shaped for the sacral area and listed for moderate-to-heavy exudate wounds there.

How long can a silicone foam dressing stay on?

Usually several days, depending on how much fluid the wound produces. Senvok's general guidance is typically every 3–5 days, depending on wound condition, and sooner if fluid reaches the border or the edges lift.

Is a foam dressing or a transparent film better for a low-exudate wound?

For dry or low-exudate wounds, a transparent film is often enough. Senvok's transparent film dressings are listed for low-exudate wounds and let you see the wound without removing the dressing.

Are Senvok silicone foam dressings latex-free?

Yes. All four sizes are listed as latex-free and come individually wrapped.

Can I shower with a silicone foam dressing on?

The 7.5 cm and 15 cm Senvok foam dressings are described as waterproof, but avoid soaking the wound and change the dressing if water gets under the border. Follow your clinician's advice for surgical wounds.

Can I use a silicone foam dressing on an infected wound?

Signs of infection such as spreading redness, warmth, pus, odor or fever need a clinician's assessment. Senvok's listed uses specify non-infected diabetic foot ulcers.