All-water-based Polyurethane Rigid Foam Spraying Composite Material for Coaches

This technical manual applies to all-water-based polyurethane rigid foam spraying compound A0, OI25 and OI28. The primary differentiation among A0, OI25, and OI28 lies in their flame retardancy performance. Selection of bus body materials should align with local regulatory requirements for fire safety compliance. Notably, OI28 exhibits the highest flame retardancy level within this product series.

1. Product Overview

The all – water – based polyurethane rigid foam spraying compound (A0) is a low-density formulation utilizing water as the sole blowing agent, free from auxiliary chemical blowing agents. When combined with WANNATE®2208 isocyanate component, it produces flame-retardant foam with exceptional environmental properties:

Ultra-low formaldehyde content.

Minimal odor emission.

Zero ozone depletion potential (ODP).

Primary Application: Thermal insulation and noise reduction for coach roofs and side panels.

2. Product Application

The all – water – based polyurethane rigid foam spraying compound (A0) for buses is rapid-curing system (non-load bearing), specifically used for heat preservation and noise reduction inside buses and is a low – density all – water spraying compound. In addition, it can also be used for interior insulation of buildings.

This compound adopts a fast – curing system, but the product itself does not have load – bearing capacity. It is more suitable for most spraying insulation scenarios that do not require load – bearing, especially in the construction of the heat – insulation field.

Note: Mandatory field testing required prior to full-scale application to verify performance under project-specific conditions.

3. Operational Guidelines

Critical Pre-Use Notice:
Product may exhibit ingredient sedimentation during storage. Mix thoroughly until homogeneous white/yellow emulsion is achieved before application. Before construction, carefully check and calibrate the conveying ratio of the black and white materials and the mixing pressure in the high – pressure spraying machine.

Spray Parameters:

Parameter	Specification
Equipment	High-pressure spray machine (calibrated 1:1 ratio)
Ambient Temperature	5–40°C (heating required if <5°C)
Wind Speed	≤5 m/s (Beaufort 3)
Material Temperature	>40°C at nozzle
Layer Thickness	Single-pass application to target thickness

Safety Compliance:

Designate “No Open Flame” zones per GB 50404-2017 or local regulations.
Implement hot work permit system for adjacent operations.

The suitable environmental temperature for spraying operations is between 5°C and 40°C, and the wind speed should not exceed 5m/s (equivalent to level 3 wind). In rainy days, it is prohibited to carry out construction in the open air. When the construction environmental temperature is lower than 5°C, reliable technical measures must be taken to ensure the spraying quality.

During the spraying operation, ensure that the temperature of the black and white materials entering the spray gun is higher than 40°C. At the same time, ensure that the substrate is dry and clean. During construction, spray to the designed insulation layer thickness in one go. Other relevant standards should be strictly implemented in accordance with national standards. If the above conditions are not met, all responsibilities arising therefrom will be borne by the buyer.

The construction site should be designated as a fire – free area, with good ventilation, away from fire sources, and smoking is strictly prohibited. When there is hot work nearby, the hot work approval system must be strictly implemented, and corresponding safety protection measures should be taken, with special personnel assigned for monitoring.

Before officially starting the project construction, the buyer must conduct tests in an environment that is exactly the same as the actual construction conditions to confirm the applicability of the compound system in the specific project. Formal construction is regarded as the buyer’s recognition of the product’s performance inspection. If the above requirements are not followed, all responsibilities will be borne by the buyer.

4. Packaging & Storage

Packaging: 200L steel drums (200kg net weight).

Storage Conditions:

Temperature: 5–30°C (avoid >40°C).
Protection: Moisture-proof, UV-shielded.
Shelf Life: 2 months (After 2 months, it can still be used after passing the inspection.)

Sedimentation Note:
Slight stratification after ≥7 days is normal. Re-mix thoroughly without quality impact. It should be stored in a low – temperature, well – ventilated and cool environment, sealed, avoiding direct sunlight and long – term storage in an environment above 40°C. If it is left standing for one week or more, slight stratification may occur, which is a normal physical phenomenon. Just stir it evenly to eliminate the stratification, and it will not affect the normal use of the product.

5. Safety Protocols

During the operation, be extremely careful to avoid direct contact between the compound and the skin and prevent it from splashing into the eyes. Direct contact with the all – water – based polyurethane rigid foam spraying compound (A0) for buses may cause moderate eye irritation, mild skin irritation, and may also cause skin allergies. Repeated inhalation of high – concentration vapors can lead to respiratory allergies. In case of the above situations, seek medical advice immediately and take symptomatic treatment measures such as anti – inflammation and anti – allergy.

PPE Requirements:

Chemical-resistant gloves (Butyl/Nitrile).
ANSI-approved goggles.
Protective coveralls.

First Aid Measures:

Eye Contact: Flush with water ≥15 mins → medical attention.
Skin Contact: Wash with soap/water → anti-inflammatory treatment if needed.
Inhalation: Move to fresh air → oxygen supply if distressed.

Fire Safety:

This product does not belong to the categories of flammable liquids, explosives, oxidizers, corrosives, poisons, or radioactive dangerous goods, and is not a dangerous product.

NFPA Classification: Non-flammable (storage/transport).
Extinguishing Media: CO₂/dry powder for small fires; fine water spray for large-scale incidents.

6. Spill Management

Spill Scale	Procedure
Minor (<1L)	Dilute with water → drain to treatment system
Major (≥1L)	Contain with absorbents → professional recovery
Surface Decon	Scrub with 5% ammonia solution → pH-neutral rinse

Disposal must comply with local hazardous waste regulations (e.g., China GB 5085.3-2007).

7. Disclaimer

Performance data represent typical values under controlled conditions. End-users must:

Conduct application tests
Verify compliance with intended use
Assume all post-delivery processing risks

The indicators and data provided in this material are based on our current technical knowledge and practical experience and are for reference only. The specific guaranteed indicators shall be subject to the provisions in the quality guarantee letter or supply contract. Users are responsible for testing the products purchased from our company to verify whether they are suitable for their intended processes and applications and can achieve the expected goals. Our company cannot control the further application and processing of the products. Therefore, our company’s liability for the products is limited to the delivered and used parts. Our company does not assume liability for indirect losses caused during the production process using our company’s products as raw materials. Our company’s technical support and customer service center are dedicated to providing you with product consultation and application technical services. You are welcome to contact us by letter or phone.

Technical Support:
Wanhua Energy Conservation Technology (Yantai) Co., Ltd.
Address: No.56 Taiyuan Road, Yantai, Shandong 264006, China
Tel: +86-400-059-1116 | Fax: +86-17761309662