Specifying a fabric for a hospital curtain contract
A designer is specifying fabric for curtains in a hospital day-surgery waiting area. Requirements: the curtains must be flame-retardant to the standard required for public buildings, launderable at high temperature to control infection, resistant to fading from strong afternoon sun through large windows, and dimensionally stable so they do not shrink above the floor. The budget is tight and the contract runs for eight years with quarterly laundering. Two candidates are offered. Fabric P is a 100% polyester inherent FR fabric at 240 gsm with a light colour; it passes flame tests, tolerates 70°C washing, and is cheap, but the supplier warns that light shades can yellow under UV. Fabric Q is a wool/polyester FR blend at 320 gsm in a mid-tone; it passes flame tests, tolerates 60°C washing, has good UV resistance, but costs 35% more and is heavier.
1. Recommend a fabric and justify the choice against the four requirements and the eight-year contract.
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Fabric Q is the better specification for an eight-year, quarterly-laundered contract. Flame retardancy: both pass, so this does not separate them. Launderability: Q tolerates 60°C, which is adequate for infection control when combined with detergent and drying, though P's 70°C is slightly better; this is a point to P. UV resistance: this is decisive. The waiting area has large windows and strong afternoon sun, and P's light shade is flagged for yellowing under UV. Over eight years and 32 launder cycles, yellowing would degrade appearance and force early replacement, wiping out P's price advantage. Q's mid-tone and wool content resist fading. Dimensional stability: Q's heavier wool/polyester blend is more stable and less prone to the shrinkage that would lift a curtain above the floor; P is lighter and more likely to distort. Cost: Q is 35% dearer, but the judgement is whole-of-life cost: replacing yellowed, faded curtains within eight years costs more than the initial premium. The recommendation is Q, with a note to confirm the FR certification and laundering test data from the supplier before ordering.
2. The budget holder insists on Fabric P to save money. Set out the risks and the conditions under which P could be accepted.
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Risks of P: (1) UV yellowing of the light shade under strong afternoon sun, which is an appearance failure in a patient-facing area and may breach the aesthetic expectation of the contract; (2) shrinkage over repeated 70°C laundering, which could lift hems above the floor and require re-hemming or replacement; (3) premature replacement within eight years, converting a cheap purchase into a higher whole-of-life cost; (4) possible colour inconsistency between replacement batches if only some curtains are replaced. P could be accepted only if conditions are met: the supplier provides UV/lightfastness test data for the specific shade and a laundering shrinkage result after a representative number of cycles (for example, 10–15 washes to simulate several years), the client accepts a documented shorter replacement cycle with a budget line for it, and the specification includes a darker shade or a UV-blocking lining to reduce yellowing. The budget holder should sign off on those conditions so the risk is explicit rather than hidden. If the data cannot be supplied, the honest recommendation remains Q.