Duralac green insulating and sealing 250ml – code: 65.750.01

Duralac Green insulating and sealing 250 ml (code 65.750.01)

Duralac Green is the renewed version of the original Duralac: a plastic insulating and sealing designed for maintenance use, especially when it is necessary to reduce the risk of galvanic corrosion at the contact point between different metals. In the nautical field this problem is common: components and accessories are often paired with screws or fasteners of different materials, and precisely in the contact areas oxidation and degradation phenomena can start over time.

The product appears as yellow paste without chromates, designed to remain resistant and flexible. Once placed between the surfaces during assembly, it helps create an insulating layer between the metals, also functioning as a seal at the coupling point. It is a practical solution for ordinary and extraordinary interventions, both in the workshop and on board.

Product features and details

Duralac Green is designed to be used directly during assembly, as a plastic barrier between two dissimilar metals. The formulation is intended for typical nautical maintenance work, where products that are easy to apply and controllable during assembly are required.

Key points

• Function: plastic insulating and sealing for contact points between different metals.
• Usage purpose: prevention of galvanic corrosion in the coupling areas.
• Appearance: yellow paste.
• Composition: without chromates (useful information in product selection in maintenance contexts).
• Behavior: material resistant and flexible, designed to remain effective as an interposed layer.
• Application: by brush; must not be diluted.
• Format: 250 ml.
• Supplier code: 65.750.01 (Osculati S.r.l.).

What it does (in practice) on a metal coupling

When two different metals are clamped together (for example with screws, bolts, rivets, or studs), a direct contact point is created that can become critical in a marine environment. Duralac Green is used as interposed paste between the parts: during coupling, it fills micro-discontinuities and creates a plastic layer that helps to separate the metals. This approach is particularly suitable in joints where moisture and salt can easily reach the contact area.

Typical applications in the nautical field

The most common applications concern hardware and accessories installed on different metal structures, or fixed with fastening elements heterogeneous in material. Below are some practical examples (typical of onboard maintenance) where the product is used.

Examples of use

• Aluminum cheeks fastened with stainless steel screws.
• Winches in aluminum o brass fastened with stainless steel bolts.
• Stainless steel accessories for shaft fastened on the’aluminum shaft with rivets or screws.
• Cleats paired with studs of different metal.

When it makes sense to choose it

Duralac Green is suitable when, during assembly or replacement, a direct contact between different metals is expected and you want to insert an insulating barrier at the coupling point. It is often chosen in cases of:

• installation of new equipment on existing metal surfaces;
• reassembly after maintenance or overhaul (for example removal and reinstallation of accessories);
• interventions on areas known for oxidation or deterioration over time;
• assemblies with mixed fastenings, where it is not possible to standardize materials.

Operational advantages

In a technical context such as nautical maintenance, the effectiveness of an insulator/sealant also depends on ease of use. Duralac Green is designed as a “bench” or “on-board” product, usable during assembly without complex steps.

Why it is useful in maintenance

• Preventive approach: helps manage a critical point typical of couplings between different metals.
• Double function: insulator between metals and contribution to joint sealing.
• Controlled application: the use by brush allows applying the product where needed, limiting waste and inaccuracies.
• No dilution: ready to use, useful when working on site or on board with limited time and space.
• Flexibility: formulation described as resistant and flexible, suitable to remain interposed in the joint.
• Chromate-free: important feature for those who prefer chromate-free formulations.

Usage and application notes

To achieve a result consistent with the product's function, it is advisable to think in terms of an “interposed layer”: Duralac Green should be applied during the coupling of the parts, so as to remain between the metal surfaces once tightening is complete.

Usage indications (based on available data)

• Application: apply by brush on the contact surfaces or in the areas where the metals will be joined.
• Dilution: do not dilute.
• Time of use: during assembly/fitting, before final tightening.

Practical notes for an orderly work

In typical applications (screws, bolts, rivets, and studs), it is useful to apply the product evenly on the affected areas and then proceed with the joining. If material leakage occurs during tightening, finishing can be carefully managed to keep the work area clean without removing the useful layer at the contact point.

Product identification

• Product: Duralac Green insulator and sealant
• Format: 250 ml
• Code: 65.750.01
• Technofluid SKU: oscu0000001511
• Supplier: Osculati S.r.l.

For maintenance needs on mixed joints (aluminum/stainless steel, brass/stainless steel, and similar cases), Duralac Green represents a concrete and immediate option, designed for technical use in the nautical environment.

FAQ – Frequently Asked Questions

What is Duralac Green used for?

Duralac Green is a plastic insulator and sealant used to help prevent galvanic corrosion at the contact point between two different metals, by interposing itself between the surfaces during coupling.

On which metal couplings is it usually used on boats?

It is typically used on pairings such as aluminum flanges with stainless steel screws, aluminum or brass winches with stainless steel bolts, stainless steel accessories fixed on aluminum shafts with rivets or screws, and cleats with studs of different metal.

How is Duralac Green applied?

It is applied with a brush directly on the surfaces that will come into contact or in the coupling areas, during assembly.

Should Duralac Green be diluted before use?

No. The product must not be diluted and is ready to use.

What does the product look like?

Duralac Green appears as a yellow paste without chromates, designed to be resistant and flexible once placed between metals.