SMS combines spunbond and meltblown layers. Buyers usually choose this option when they need a balance of strength, barrier direction and converting stability. SMMS adds another meltblown layer for projects that require a higher barrier direction.
The buying risk is vague barrier wording. A useful RFQ should state the end use, target GSM, width, treatment direction and any test standard requested by the buyer or destination market.
For barrier-related materials, sample confirmation should come before bulk pricing. Test results, packaging format and converting conditions can change the final specification.
RFQ checklist
End use and barrier target
SMS or SMMS direction
Test standard if required
Packaging and converting condition
