Everything You Need To Know To Find The Best Food grade High speed Coating Line

03, Mar. 2025

 

How to Evaluate a Coating for Food Service - SilcoTek

In order to receive NSF approval for food service, coatings must go through a thorough series of tests.  In this blog post we'll discuss how a coating is evaluated for food service.

For more information, please visit Litong.

How to Evaluate a Coating for Food Service

Coatings like Dursan have been tested to NSF International food service standards and have been found to meet the NSF criteria.  Let's discuss the standard and test criteria needed to achieve NSF and FDA compliance.

In this blog post you will learn:

  • Steps needed to evaluate a coating for NSF food service compliance
  • Test criteria used by NSF to test coatings for food service compliance and FDA compliance.
  • Methods used by NSF to test and approve coatings for food service.

First off if you're evaluating a component that is coated, the standard requires the entire component, not just the coating must be compliant.  A coating applied over a non compliant component material will not suddenly make the underlying material compliant.  So there's no glossing over compliance.

About NSF and FDA Compliance.  Do Silicon Coatings Meet Industry Standards?

The United States Food and Drug administration (FDA) does not formally "approve" coatings or other materials for food or bio/pharmaceutical contact.  Rather, the FDA regulates coatings via the Code of Federal Regulations (CFR), specifically 21 CFR 175.300 which lists what raw materials are acceptable and unacceptable for the formulation of coatings.  It is then up to the coating supplier to self-regulate to ensure that they are using raw materials that are acceptable.

According to the FDA, a coating must:

1) Pass the solvent extraction tests listed in 21 CFR 175.300.

2) Contain no heavy metals.

3) All coating components must conform to the materials listed by the FDA in order to be compliant.

These stipulations are also required for NSF/ANSI 51 certification. Dursan® successfully meets these requirements and is therefore FDA compliant.

NSF Testing

The review and compliance process for coatings in food service involves the following:

Submission of the coating to be tested. 

This involves a review of the coating process and coating formulation.  This allows NSF to classify the coating type and establish the test criteria for that particular coating. 

Testing criteria is finalized per NSF/ANSI 51 - . 

The intent of the standard is to establish a baseline or minimum protection and sanitation requirement for materials utilized in commercial food equipment.  The standard tests for material corrosion resistance, abrasion, heat tolerance, impact resistance, cleanability, and adhesion as they apply to the particular coating material.  The overall concern is to assure food safety by setting criteria that will minimize the potential for leaching or exposure to substances that can have a negative effect on food quality.  

Testing is determined by the coating classification.  Tests may include:

Abrasion resistance:

Test samples are loaded into an abrasion machine.  Test wheels (applying over 4 lb of pressure) roll over the surface for 500 to wear cycles (depending on coating classification).  The before and after sample mass is measured and compared.  Total loss for a test sample cannot exceed 100mg and the coating must remain intact without base coat or underlying surface exposure.  SilcoTek coatings are bonded to the surface by chemical vapor deposition.  There is no base coat to complicate the integrity of the coating surface bond.  Read about our abrasion resistance test. 

Cleanability: 

Samples are washed with a non-ionic detergent at about 162F.  Synthetic lard is then applied to areas of the sample and then cleaned in a washing machine.  Remaining soil is measured by a beta radiation counting system.  Acceptance criteria for food service is 30ug for the control zone tested.

Corrosion resistance:

Samples are subjected to ASTM B117 salt fog testing for 192 hours.  Samples are then cleaned with water and air dried.  Samples are then examined for evidence of corrosion.  SilcoTek coatings like Dursan can withstand salt spray exposure for over hours with minimal to no corrosion.  Here's what our Silcolloy® and Dursan® coatings look like after hours of salt spray exposure. 

Heat resistance:

Samples are heated to 400F for 30 minutes.  A heated washer is then placed on the surface.  The sample and washer are allowed to cool to room temperature.  After cooling the surface is tilted to 45 degrees.  The washer should slide off the surface and the coating should not blister or be damaged.  SilcoTek coatings offer superior heat resistance.  Watch our heat resistance demonstration to learn more.

For more Food grade High speed Coating Lineinformation, please contact us. We will provide professional answers.

Adhesion:

Test samples are tested per ASTM D method B.  After testing, the sample should remain smooth and intact.  Samples are classified per ASTM D 5B.

Organic coatings undergo a different test criteria.  The samples are scored and conditioned in a hot water bath for 4 hours.  After removal from the bath and drying, a pull tab is applied to the surface using a cyanoacrylate adhesive.  After drying, a load of 500psi is applied to the tab in a tensile test system.  The coating should remain intact during the test and remain attached to the surface.

Impact resistance:

The coating surface is evaluated according to ASTM D.  The surface is impacted with a 1/2 in diameter 2 lb weight for a total impact force of 60 in-lbs.  For organic coatings, the sample is tested by dropping a 0.15lb steel ball from a high of 200 inches.  Glass coatings get tested by dropping a lighter ball for a shorter distance.  

After impact the sample is inspected for damage.  The surface cannot peel, chip or crack.

SilcoTek's wear, corrosion, and adhesion testing completed in past evaluations are more rigorous, but needless to say the NSF testing can be a challenge to pass.  Especially for organic coatings.  

Read our NSF certificate.

What are Food Grade Coatings? - Litong Group

Distribution centres and food stockists have a duty of care when it comes down to food safety. This week's article looks into and discusses the reasons for food grade coatings and why they are so important to the catering industry.

What is a Food Grade Coatings and why do I need it?

There are many variants of food safe coatings out there. However, they all have the same end goal, and that is to ensure that the food manufactured or stored in a certain facility remains contamination and bacteria free.

Companies such as ourselves provide businesses with a full on site food grade spraying service to assist with this. Using a specialised coating, certified technicians are able to apply a spray coating that is highly durable, bacteria free and long lasting.

The overall aim of these coatings is to ensure that the safety of the food is never compromised. The coatings we use here at CJ Paint Spraying comes with a number of benefits. These have been proven to reduce the growth of harmful bacteria such as MRSA and E-Coli.

Do Not Avoid Clean Room Coatings

The risks of not coating a clean room or food safe area sufficiently can be extremely costly.

Failing to ensure that food safe spraying is completed will result in the likely contamination of food products, leading to customer complaints, staff and customer illnesses, loss of sales, damaged reputation and more.

Personally, if I was taking charge of a local food storage facility ' one of my first jobs would be to ensure that the storage area and handling zones where thoroughly cleaned and correctly coated. Not only will this reduce the chances of the above points from occurring, but it will put you and your business in good stead going forward.

Why is it so important to have food safe coatings?

In the food production industry, there is a range of standards you must adhere to; this can be national and international depending on where your food is going. Particular food safe coatings have a range of properties that work alongside your health and safety. In normal paints, you can find volatile organic compounds which usually is solvents. These solvents can be released into the air as the paint starts to dry. Solvents can cause a range of acute symptoms including headaches and dizziness if your employees are inhaling solvents over long periods of time this could also lead to more serious symptoms such as cancer.

Food poisoning is one of the biggest worries in the food production industry; this is because it can spread like wildfire. Once bacteria has grown, it can be easily transferred.

Here at CJ Paint Spraying, we use a water-based product which means while spraying it dries a lot quicker, therefore reducing the loss of production time. We adhere to all strict food safety regulations as we understand the need for food hygiene.

Why do contaminants grow?

Unfortunately, due to the number of people that enter your food area, there is a wide range of bacteria and contaminants they bring along with them. Usually located either on shoes or hands, no matter how much you wash something there is still a small chance you can contaminate food.

Benefits of food safe coatings

There are many benefits you need to consider when it comes to food safe coatings. All food safe coatings are resistant to hot water, oils, any fats and steam, this means that nothing can break through the coating nor can it affect the hygiene. Food safe coatings are much easier to clean as they are a non-porous surface, this means contaminants and bacteria find it hard to stick to the surface.

Coatings can withstand extreme temperatures, if you are in a food processing factory which requires the temperature of the room to be extremely hot or cold the coating is not affected.

Food safe coatings also give you a piece of mind when prepping any food. It will allow you to prep the food in a fully protected zone. All food prep areas will be in accordance with food hygiene regulations.

Industries that need food-safe coatings

There are a number of different industries that may require a food grade coating. The Food and beverage industries are some of the main businesses that require a food-safe coating to ensure they meet food hygiene regulations. Many restaurants, pubs and bars require a food hygiene rating, if the score is low, the food standards agency help businesses to improve their overall hygiene rating.

Breweries are open to a lot of contamination and bacteria exposure, due to the way they produce the beer, and the temperature some of the liquid has to reach can help cultivate bad bacteria. Alcohol is usually left for long periods of time for it to develop into the drink we like to consume which means it is imperative they are stored in a clean and sanitary place. For any alcohol to be produced in safe and hygienic environment it is vital they have a food grade coating applied.

Educational facilities need to ensure they are extremely clean and safe at all times. We all know children are less likely to wash their hands and tend to bring a lot of dirt inside. It is more likely for bacteria to breed which is why it is so important that these areas are kept clean and sanitary. The last thing you want is to be giving your students food poisening, food grade coatings minimise the risk of this happening and also help during the cleaning process.

Summary

Food grade coatings are a great way of fighting the risk of contamination and bacteria growth. If you do not have a food-safe coating you may want to think about having one installed, not only are you more likely to meet your food safety regulations or food hygiene rating, it also helps to make the cleaning process easier.

Are you interested in learning more about Coating Line Manufacturer? Contact us today to secure an expert consultation!