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| Marca: | SUNHOUSE |
| Número do modelo: | 1220x244m-12mm |
| MOQ: | 800 |
| Condições de pagamento: | L/C,T/T |
Moisture resistant gypsum boards should be evaluated through measurable water absorption data, facing performance, mold test results and intended-use documentation. A green surface, low board weight or general waterproof claim is not sufficient evidence. Buyers should distinguish total water absorption, surface water absorption and mold resistance because each property evaluates a different part of the product and has different application limitations.
Evaluates how much water the complete specimen absorbs under the specified test conditions.
Evaluates water uptake through the tested board surface rather than through every exposed edge.
Evaluates visible fungal growth on a tested surface under controlled laboratory conditions.
Product performance still depends on leak prevention, ventilation, drying and correct system design.
Water absorption testing measures how the board or its surface responds to liquid water under defined laboratory conditions. Mold resistance testing evaluates visible mold growth on a specified product surface in a warm, humid test environment. A board can perform well in one test without automatically providing the same level of performance in the other.
Mold growth also depends on moisture duration, temperature, surface dust, organic contamination, ventilation, condensation and concealed leaks. Moisture resistant board reduces product vulnerability but cannot correct an uncontrolled source of water inside the building.
Total water absorption generally compares the conditioned dry mass of a test specimen with its mass after the specified water exposure. The result is normally expressed as a percentage increase in mass. It reflects the combined influence of the gypsum core, additives, facings and exposed specimen edges under the test method.
Surface absorption testing evaluates water uptake through a defined area of the board face. It is particularly relevant to treated paper or other water-repellent facings. The result does not automatically describe performance through cut edges, screw holes, joints or damage.
Mold resistance testing exposes the specimen surface to conditions intended to support fungal growth. The reported score describes visible growth on the tested surface during the test period. It is not a guarantee for every climate, installation or service condition.
Installed durability depends on whether the assembly can remain dry or dry quickly after incidental moisture. Board selection must therefore be coordinated with ventilation, waterproofing, vapor control, plumbing design and finishing materials.
Product construction varies by manufacturer. Some boards use treated paper facings, while others use fiberglass mats or alternative facers. The exact facing, core treatment and approved application should be verified in the technical data sheet.
| Comparison Item | Total Water Absorption | Surface Water Absorption |
|---|---|---|
| Primary Focus | Water uptake by the complete test specimen. | Water uptake through a defined area of the tested board face. |
| Typical Result Format | Percentage increase in specimen mass. | Mass of absorbed water per unit surface area. |
| Main Product Influence | Core formulation, water-repellent additives, facings, specimen edges and overall product structure. | Facing treatment, surface continuity and resistance of the tested face to water uptake. |
| What It Does Not Prove | It does not prove that joints, corners and penetrations form a waterproof wall. | It does not prove that cut edges or damaged areas have the same resistance as the intact face. |
| Buyer Application | Compare product classifications and batch consistency under the applicable standard. | Evaluate surface treatment and compatibility with humid-room or tiled-wall applications. |
| Common Purchasing Error | Treating a low percentage as evidence that the board can remain permanently wet. | Assuming the same performance at board edges, screw holes and service penetrations. |
Water absorption results should only be compared when the test standard, specimen dimensions, conditioning, exposure time, water temperature, calculation method and product thickness are equivalent. A supplier's internal immersion test should not be compared directly with a result obtained under a standardized product method.
Under EN 520, moisture resistant plasterboards can be classified as Type H1, H2 or H3 according to their declared water absorption performance. A lower permitted absorption value represents a stricter Type H classification.
| EN 520 Type | Total Water Absorption | Surface Water Absorption | Procurement Interpretation |
|---|---|---|---|
| H1 | Not Greater Than 5% | Not Greater Than 180 g/m² | Select when the project requires the stricter H1 reduced-absorption classification. |
| H2 | Not Greater Than 10% | Not Greater Than 220 g/m² | Common moisture resistant classification for suitable interior humid-area systems. |
| H3 | Not Greater Than 25% | Not Greater Than 300 g/m² | Provides reduced absorption but should not be presented as equivalent to H1 or H2. |
North American moisture resistant gypsum products are commonly evaluated under the applicable ASTM product specification using physical test methods for gypsum panel products. Buyers should request the exact board category, test method, result and acceptance requirement rather than asking only whether the product has an ASTM certificate.
| Document Or Test | Primary Purpose | Buyer Verification |
|---|---|---|
| ASTM C1396/C1396M | Product specification covering multiple gypsum board categories, including water-resistant gypsum backing board. | Confirm the product category, thickness, physical properties and intended application shown in the supplier documentation. |
| ASTM C473/C473M | Physical test methods for gypsum panel products, including applicable water resistance and surface water resistance methods. | Review the complete method reference, specimen information, test result and laboratory identification. |
| Water Resistance Of Core-Treated Board | Evaluates water uptake by products using a water-repellent core treatment. | Confirm that the tested board thickness and product name match the material being purchased. |
| Surface Water Resistance | Evaluates the water resistance of a board with water-repellent facing paper. | Determine whether both face and back surfaces were tested and whether cut edges are excluded. |
| Humidified Deflection | Evaluates board deflection after exposure to specified humidity conditions. | Review this property separately when the board will be installed on humid-area ceilings. |
A general statement that the factory produces according to ASTM C1396 does not prove that every supplied board has a moisture resistant core or water-repellent facing. The report and board marking should identify the actual water-resistant product being ordered.
Mold resistance testing is designed to compare visible growth on a product surface under controlled environmental conditions. The result should be understood as a laboratory performance indicator rather than a lifetime warranty against mold in every building.
Product specimens are prepared and conditioned according to the laboratory procedure before chamber exposure.
The chamber maintains warm and humid conditions intended to encourage fungal growth on susceptible surfaces.
Specimens remain in the chamber for the period required by the applicable test procedure.
The tested surface is evaluated for visible mold growth using the rating method associated with the test.
The report should identify the tested product, surface, result, laboratory and any limitations.
Gypsum panel manufacturers commonly use ASTM D3273 to report resistance to visible mold growth on product surfaces. A reported score of 10 is generally presented as the highest result on the test rating scale.
| Reported Result | General Interpretation | Buyer Limitation |
|---|---|---|
| Score 10 | No visible mold growth observed on the tested surface under the specified test conditions. | It does not prove that concealed surfaces, cut edges, installed joints or contaminated finishes will remain mold-free. |
| Lower Numerical Score | Increasing levels of visible surface growth were observed according to the test rating scale. | Scores should only be compared when products were tested using the same method and reporting procedure. |
| Pass Statement Only | The specimen met a supplier, product or project acceptance criterion. | Ask for the numerical result, tested surface, exposure period and acceptance requirement where available. |
| No Visible Growth Claim | May describe the laboratory observation. | Verify that the statement comes from a complete report and is not only marketing language. |
The installed wall can still develop mold when water enters through plumbing leaks, failed sealant, exterior infiltration or condensation. Dust, wallpaper adhesive, paint films and other surface materials may also support growth even when the underlying board performed well in a laboratory test.
A short humidity increase is different from a concealed leak that keeps the board damp for days or weeks.
Dust, dirt, construction residue and organic coatings can provide nutrients for mold growth.
Poor air extraction allows humidity and condensation to remain on walls and ceilings.
Warm surfaces and humid air can create conditions favorable to biological growth.
Incorrect insulation or vapor control can create moisture behind an apparently dry finished surface.
Small leaks at pipes, valves, baths and shower fittings can remain concealed inside partitions.
Paint, wallpaper, adhesive and tile systems can change surface drying and biological resistance.
Wet screeds, plaster and concrete can release moisture after the drywall system is installed.
| Comparison Item | Treated Paper-Faced Board | Glass-Mat Gypsum Panel |
|---|---|---|
| Facing Material | Moisture- and mold-resistant treated paper facings. | Fiberglass mat facings on one or both surfaces. |
| Typical Interior Finish | Familiar drywall finishing and decorating process. | Finishing requirements may differ by product and intended final appearance. |
| Mold Test Performance | Many specialty products report high mold-resistance results. | Glass-mat products commonly report strong resistance to visible mold growth. |
| Construction Exposure | Normally intended to remain protected from rain and uncontrolled wetting. | Some specific glass-mat products permit limited pre-dry-in exposure under manufacturer conditions. |
| Wet-Area Suitability | Depends on product approval and complete waterproofing system. | Also depends on exact product type and system approval; glass mat does not automatically mean waterproof. |
| Buyer Decision | Suitable where familiar interior finishing and controlled humidity exposure are priorities. | Consider where enhanced facing durability or construction moisture resistance is specifically required. |
Interior glass-mat panels, exterior gypsum sheathing, roof boards and tile backer products have different standards and application limits. Buyers should identify the exact product category rather than specifying only “fiberglass gypsum board.”
Third-party reports support initial product qualification, but bulk purchasing also requires factory production control. Water-repellent additive dosage, paper treatment, core density, drying and storage can vary if the process is not properly monitored.
Water-repellent additives should be measured and recorded according to the approved formulation.
Paper supplier, treatment, weight and storage condition can influence surface absorption.
Consistent mixing supports even distribution of water-repellent ingredients through the gypsum core.
Damaged, open or poorly formed edges can create faster paths for moisture penetration.
Inconsistent drying can affect residual moisture, paper bond and product stability.
Testing should occur at a defined production frequency rather than only before the first order.
Test records should be linked to production dates, board markings and pallet labels.
Failed batches should be isolated and prevented from being mixed with approved export material.
| Inspection Item | Recommended Check | Purchasing Purpose |
|---|---|---|
| Board Marking | Manufacturer, product type, thickness and batch code. | Connects the delivered board with the approved reports. |
| Surface Condition | No paper damage, bubbles, stains, wrinkles or delamination. | Reduces the risk of localized water entry and finishing failure. |
| Edge Condition | Straight, compact and free from repeated crushing or open core. | Supports consistent joints and reduces exposed-core absorption. |
| Board Dimensions | Thickness, width, length, squareness and taper profile. | Confirms compliance with the approved product specification. |
| Batch Water Absorption | Test selected specimens using the agreed standardized method. | Confirms current-production performance rather than relying only on an earlier type-test report. |
| Factory Records | Additive dosing, paper batch, production date and quality results. | Helps identify formulation changes and production variation. |
| Pallet Moisture Condition | No wet boards, condensation, stains or damp wooden supports. | Prevents shipment of material already affected by moisture. |
| Container Condition | Dry floor, watertight roof, clean interior and suitable bracing. | Reduces rain leakage, condensation and transport damage. |
Facing color does not prove water absorption or mold resistance.
An absorption percentage has little meaning without the test method.
Results with different units and test purposes are incorrectly compared.
The supplied board may have substantially higher permitted absorption.
Laboratory resistance is exaggerated into an unlimited real-world guarantee.
The tested product, surface, laboratory and date cannot be verified.
The report may not cover the board thickness included in the quotation.
Product performance cannot automatically be transferred between plants.
Intact face performance is assumed to apply to every exposed edge.
Low board absorption is used to justify installation without required tanking.
Moisture resistance is incorrectly treated as permission to ship soaked boards.
Current production may not match the product tested in the report.
Moisture Resistant Gypsum Plasterboard, EN 520 Type H1 Or H2 As Specified, Declared Total And Surface Water Absorption Within The Applicable Classification Limits, Specified Thickness And Dimensions, With Product Declaration, Test Data, Batch Identification And Manufacturer Installation Instructions.
Moisture And Mold Resistant Gypsum Panel, Compliant With The Applicable ASTM C1396 Product Category, Water Resistance Tested Using Applicable ASTM C473 Methods, Mold Resistance Tested To ASTM D3273, Specified Thickness And Facing Type, With Product Identification, Laboratory Documentation And Batch Traceability.
Total absorption measures water uptake by the complete test specimen, while surface absorption measures uptake through a defined board surface. They use different units and should not be treated as the same result.
H1 has stricter permitted total and surface water absorption limits. However, project suitability also depends on the complete wall or ceiling system and actual water exposure.
No. H1 identifies reduced water absorption performance under EN 520. It does not turn board joints, cut edges and penetrations into a complete waterproof barrier.
No. It indicates no visible growth on the tested surface under the specified laboratory conditions. Building leaks, condensation, dust and unsuitable finishes can still create mold risk.
No. Green, blue, purple or other facing colors are not universal mold-resistance classifications. Review the product code and test report.
Only when the report or accepted product documentation clearly covers the relevant product family and surfaces. The tested product should match the board being purchased.
Not automatically. Glass-mat facings can improve moisture and mold resistance, but the product must still be selected according to its intended application and complete system requirements.
Water-exposed boards should be assessed according to manufacturer guidance. Distortion, paper separation, mold, soft edges or loss of strength may require rejection.
Mold testing is generally used for product qualification or periodic verification rather than every shipment. Routine batch control can focus on formulation, water absorption, facing quality and traceability.
Confirm the product standard, H classification or ASTM category, total and surface absorption limits, mold test method, facing type, intended use, thickness, batch control, packaging and dry-delivery requirements.
Provide the required ASTM or EN standard, H1, H2 or H3 classification, total and surface absorption limits, mold-resistance requirement, board thickness, intended application and project quantity. The product data, batch testing and export inspection plan can then be reviewed before bulk production.
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